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ACME |
Download Bitsy Bye 2.4.2 Source code from ProDOS 8
2.4.2 |
Oliver Schmidt, 17 janv 2018.
Hi John,
>I have Bitsy Bye fixes for the Appletalk workstation card and Mac LC
Apple II card and was
>planning on releasing them with new features in 2.5 rather than doing
a 2.4.2 release.
It's a pity that you haven't open sourced Bitsy Bye by now for at
least two reasons:
1. The fixes you mention above would visible as explicit commits which
I'm pretty sure would be interesting to others (aka me) too.
2. It would allow others (aka me) to (try to) create variants of the
Bitsy Bye screen layout making that probably compatible with the taste
of a larger number of users.
Regards,
Oliver
Oliver Schmidt, 17 janv 2018.
Hi John,
>I intend to open source Bitsy Bye along with several new drivers as
part of ProDOS 2.5.
Cool :-)
>The issue is that Bitsy Bye 2.4 is parsing directories in a way that
is incompatible with ProDOS 2.5,
>so I want to hold off sharing that version.
I see, although - as mentioned in PM - I personally would prefer to
see the 2.4 version released and the changes you made/make for 2.5
made visible as changes so that the history becomes available too.
That could even become a positive thing for you personally. I imagine
people having written software that's incompatible with 2.5 asking you
what they need to change. Then you could - beside giving a conceptual
answer - point them to your BB change as an example what needs to be
done. Coding more as a social process than a purely result driven
me-myself-and-I thing ;-)
>Once the new 2.5 system is in place, it will be ready for sharing,
customizing, and migrating into other apps.
Looking forward to it, although I'd have loved to be able to
contribute to 2.5 instead to post-2.5 ...
Regards,
Oliver
;@com.wudsn.ide.asm.hardware=APPLE2
!cpu 6502
!to "BITSYBYE#061000",plain
!convtab "a2txt.bin"
*= $1000
;--------------------------------
; BITSY BYE 2.4.2 (18-JAN-2018)
; by John Brooks / Peter Ferrie
; (source) by Deckard 20181230
; ACME 6502 assembler
;--------------------------------
; New ProDOS 8 releases : https://prodos8.com
; Qkumba compression & code optimization master :
http://pferrie.000webhostapp.com/
; Deckard : http://underground2e.free.fr
; A major new feature in the 2.4 release was replacing the OS ram-resident
program launcher with a new version
; called Bitsy Bye.
; Bitsy Bye is an interactive, menu-based system for choosing which
program to run next after the previous
; program exits with the quit or bye command.
; -JB
; Our tag-team optimization of Bitsy Bye in 2016 was epic.
; -JB
; Unique goal: 6502 memory exercise
; -Dckd
; Apple II memory info
; $0000..$00FF : zero page
; $0100..$01FF : stack
; $0200..$02FF : character input buffer
; $0300..$03CF : free space
; $0400..$07CF : txt screen (+variables in holes)
;
; $0B00..$0EFF : open buffer
; $1000..$12FA : Bitsy Bye 2.4.2 (code)
; $12FB..$13FF : Bitsy Bye 2.4.2 (datas)
; $1400..$BECF : structure infos (internal files list: up to 2733 files)
2733*16=$AAD0
;--------------------------------
CV
=
$25
; cursor vertical position
BASL
=
$28
; low txt screen addr (left)
BASH
=
$29
; high txt screen addr (left)
CUR_SLOT_DRV
=
$56
; current slot/!drive fmt=0000SSS? (?=!D)
VOLNAME_LENGTH
=
$57
; volume name length+1 (including 1st "/")
PTR_1ST_NAME_ON_SCREEN =
$58
; +$59 pointer for 1st name of screen ($1400..)
PTR_WORK_NAME
=
$5A
; +$5B pointer used to work with names structure
PTR_CURRENT_NAME =
$5C
; +$5D pointer for current name (reverse cursor)
SCREEN_POSITION
=
$5E
; position on screen : $00 (top)..$0A (middle)..$13 (bottom)
DISPLAY_MODE
=
$5F
; for AND : #%00111111 ($3F) = INVERSE / #%11111111 ($FF) = NORMAL
NAME_LENGTH
=
$60
; length of name $00 (no name) or $01..$0F
FIRST_CHARACTER
=
$60
; pressed key (research by name)
TBL_ONLINE
=
$6E
; table for MLI ONLINE
TBL_OPEN
=
$72
; table for MLI OPEN
TBL_READ
=
$78
; table for MLI READ
PATHNAME_LENGTH
=
$0280
; partial path of current volume or directory
PATHNAME
=
$0281
; partial path of current volume or directory
SYS_LAUNCHER_LENGTH =
$0380
; full (root) path to the launcher (BASIS.SYSTEM or BASIC.SYSTEM)
SYS_LAUNCHER
=
$0381
; full (root) path to the launcher (BASIS.SYSTEM or BASIC.SYSTEM)
TXT_LINE0
=
$0400
; TXT screen: line 0
TXT_LINE1
=
$0480
; TXT screen: line 1
H1400
=
$1400
; internal structure infos
SYSTEM_ADDR
=
$2000
; implantation addr of SYS file
; ProDOS
MLI
=
$BF00
; machine language interface
https://prodos8.com/docs/techref/calls-to-the-mli/
DEVNUM
=
$BF30
; last used device DSSS0000
BITMAP
=
$BF58
; memory bit map (ProDOS)
; ROM
CLR80STORE
=
$C000
; 80STORE off
INIT
=
$FB2F
; screen initialization
BASCALC
=
$FBC1
; calc base addr in BASL/BASH
BELL
=
$FBDD
; DING! an error occurs...
VTAB
=
$FC22
; perform vertical tab
HOME
=
$FC58
; clear TXT screen
RDKEY
=
$FD0C
; read key
SETKBD
=
$FE89
; IN#0
SETVID
=
$FE93
; PR#0
; ProDOS MLI cmds
QUIT
=
$65
; exit from 1 interpreter, dispatch another
GET_FILE_INFO
=
$C4
; return file's attributes
ONLINE
=
$C5
; return names of one or all online volumes
SET_PREFIX
=
$C6
; change default pathname prefix
OPEN
=
$C8
; open a file
READ
=
$CA
; read 1 or more bytes from an open file
CLOSE
=
$CC
; close open file(s), flushing buffers
GET_EOF
=
$D1
; return end of file position of an open file
;--------------------------------
CLD
; bin mode (ADC/SBC)
; valid routine
LDA
$C082
; enables rom
CLI
; interrupts are allowed
STA
$C00C
; 40 col
STA CLR80STORE
JSR SETVID
JSR SETKBD
; acc=$FD (high COUT1 $FDF0) %11111101
STA
$04FB
; screen hole (scratchpad ram : slot 3)
; VMODE for RDKEY/KEYIN (escape sequence & escape enable bit)
; see "Inside the //c" Gary B. Little p.56/148/150
JSR INIT
JSR HOME
; Init ProDOS memory bitmap & copy datas in zero page
LDX
#$DF
; X=$DF..$FF
LDA
#%11001111
; $CF => used mem pages: $00/$01/$04..$07
; (zero page/stack/txt screen)
H101E
STA
BITMAP-$DF,X
; $BF58=$CF
LDA
H134F-$DF,X
; copy $134F..$136F
STA
$7A,X
; into $7A+[$DF..$FF]= [$59..$79] (zero page addressing mode)
LDA
#0
; $BF59..$BF78=0 (unused mem pages +open file buffers)
TXS
; last loop: S=$FF
INX
BNE H101E
; Apple ProDOS 8 Technical Reference Manual : Using the Stack
; System programs should set the stack pointer to $FF at the warm-start
entry point.
;
; I set the stack to $FF before launching SYS files from Bitsy Bye (the
new Quit dispatcher in P8 2.4)
; -JB
!8
$C2,2
; 6502/65c02: SKB #2 (skip next bytes / unofficial opcode)
; DOP=double NOP
; 65816: REP#%00000010 => Z=0
; acc=0/X=0
BEQ
H1034
; always (6502/65c02) Z=1
; //gs
only--start
INX
; X=1
STX
$C029
; //gs new video register=1
; //gs direct access to mega II aux bank
; //gs only--stop
H1034
INC
BITMAP+$17
; $BF6F=1: $BF mem page is used
;--------------------------------
; Build initial TXT screen with
; authors and instructions
;--------------------------------
LDX
#$57
; counter X=$57..$01 step-1
H1039
LDA
H1300-1,X
; $1300..$1356
BMI
H1045
; got a printable character
; got a special byte
; for coord update (requires 2 loop exec)
; for each coord update, the bascalc code is executed 2 times.
; - 1st is bad (X instead of Y coord + following byte) => ignored
; - 2nd is correct (Y coord and X coord) and BASCALC is correct
; comments below are for 2nd exec
; acc=txt screen line (Y
coord)
JSR
BASCALC
; set BASL/BASH pointer
LDY
H1300,X
; get X coord (next byte)
!8
$2C
; BIT trick: don't write Y coord byte on screen!
H1045
STA
(BASL),Y
; display printable character
DEY
; X coord -1
DEX
; previous data byte
BNE
H1039
; continue
; X coord=41-1=40 (ready to write "-" line)
; acc="-"
; write dashed lines #1 & #22
H104B
STA
TXT_LINE1,Y
; write "-" on line 1
STA
(BASL),Y
; write "-" on line 22
DEY
; until X coord<0 (exit)
BPL
H104B
; continue
;--------------------------------
; Get content of current S/Drive
;--------------------------------
; ProDOS unit numbers are bytes where the bits are arranged in the pattern
DSSS0000,
; where D = 0 for drive one and D = 1 for drive two, SSS is a three-bit
integer with values
; from one through seven indicating the device slot number (zero is not a
valid slot number),
; and the low nibble is ignored.
;
; It isn't practical.
; A better format is 0000SSS? where ? = !D (NOT drive #)
; 0000SSS0 means !D=0 => D=1 drive 2
; 0000SSS1 means !D=1 => D=0 drive 1
;
; To search the next unit number, you just have to:
;
; LDX current 0000SSS?
; DEX
; TXA
; AND #%00001111 (if current 0000SSS? was 0, X=$FF after DEX and now acc
contains S=7, !D=1 => D=0 drive 1)
; STA new current 0000SSS?
; test if volume is OK for this unit number
; if volume OK, get content...
;
; You can navigate over ProDOS volumes using TAB key.
; e.g. current volume = /PRODOS.2.4.2 in slot 6, drive 1 (X=current
0000SSS? = 00001101)
; TAB => after DEX : 00001100 slot 6, !D=0 => D=1 drive 2
; TAB => after DEX : 00001011 slot 5, !D=1 => D=0 drive 1
; TAB => after DEX : 00001010 slot 5, !D=0 => D=1 drive 2
; TAB => after DEX : 00001001 slot 4, !D=1 => D=0 drive 1
; TAB => after DEX : 00001000 slot 4, !D=0 => D=1 drive 2
; TAB => after DEX : 00000111 slot 3, !D=1 => D=0 drive 1
; TAB => after DEX : 00000110 slot 3, !D=0 => D=1 drive 2
; TAB => after DEX : 00000101 slot 2, !D=1 => D=0 drive 1
; TAB => after DEX : 00000100 slot 2, !D=0 => D=1 drive 2
; TAB => after DEX : 00000011 slot 1, !D=1 => D=0 drive 1
; TAB => after DEX : 00000010 slot 1, !D=0 => D=1 drive 2
; TAB => after DEX : 00000001 slot 0, !D=1 => D=0 drive 1 not a
valide ProDOS unit #
; TAB => after DEX : 00000000 slot 0, !D=0 => D=1 drive 2 not a
valide ProDOS unit #
; TAB => after DEX+TXA+AND : 00001111 slot 7, !D=1 => D=0 drive 1
; TAB => after DEX : 00001110 slot 7, !D=0 => D=1 drive 2
; get name of last used volume
LDA
DEVNUM
; DSSS0000
LSR
; 0DSSS000
LSR
; 00DSSS00
LSR
; 000DSSS0
TAX
; init !D
; easy way to get !D (NOT drive #)
INX
; X=000DSSS1 (!D=1 => D=0 drive 1)
; the original "D" in "DSSS" will not be used anymore after this CMP
; Bitsy Bye always uses 0000SSS? (?=!D)
CMP
#%00010000
; acc 000DSSS0 < 00010000 : test if D=0 (drive 1)?
BCC
H1060
; yes, drive 1
; X=000DSSS? (1st entry) D is ignored
; X=0000SSS?
H105F
DEX
; X-1
; = switch from drive 1 (!D=1) to drive 2 (!D=0)
; or exec slot-1, drive 1 (!D=1)
; if drive 1: X=0000SSS1
; if drive 2: X=0000SSS0
H1060
JSR
GET_VOLUME_NAME
; get volume name (PATHNAME)
BEQ
H105F
; Z=1 (length=0). try another slot/drive
H1065
LDA #>H1400
STA
TBL_READ+3
; read buffer (high)
STA PTR_1ST_NAME_ON_SCREEN+1 ;
1st name addr = $1400 (high)
LDY #<H1400
STY
TBL_READ+2
; read buffer (low)
STY
PTR_1ST_NAME_ON_SCREEN ; 1st name addr =
$1400 (low)
; Y=0 : max number of bytes of data to read (high)
JSR
GET_CONTENT
; get content of volume or sub directory and store it in internal
structures ($1400..)
CPY
#$4C
; end of file (MLI Read return code)
BEQ
H107B
; ok, all files read
JSR
BELL
; read error
H107B
LDA #0
TAY
STA
(TBL_READ+2),Y
; clear 1st byte of next internal file location
TAX
; X=0
; cursor on the top
H1081
STX SCREEN_POSITION
; Display full path (or less) on screen (line 0)
H1083
LDX
#34
; available size on screen=40-6 (sizeof "Ss,Dd:")
LDY
VOLNAME_LENGTH
; length
CPY
#34
; exceeds the available screen size?
BCS
H108D
; yes, length>=34. write only the end of the volname
; enough room to write the full name
LDY
#34
; force trailing spaces (if shorter name)
H108D
DEY
LDA #"
"
; character = trailing space
CPY
VOLNAME_LENGTH
; need to write it?
BCS
H1098
; yes
; write name
LDA
(TBL_ONLINE+2),Y
; get character
ORA
#%10000000
; normal mode
H1098
STA
TXT_LINE0+5,X
; write it on screen
STA
SYS_LAUNCHER,Y
; build full SYS pathname
DEX
; size-1
H109F
BNE
H108D
; not finished
LDX #2
STX
CV
; y position of the 1st name
; equivalent to
;
LDA PTR_1ST_NAME_ON_SCREEN
;
STA PTR_WORK_NAME
;
LDA PTR_1ST_NAME_ON_SCREEN+1
;
STA PTR_WORK_NAME+1
;
LDX #0
; optimization result = 3 bytes
H10A5
LDA PTR_1ST_NAME_ON_SCREEN-1,X ; init
working ptr
STA PTR_WORK_NAME-1,X
DEX
BNE H10A5
; optimized routine for:
; - writing a vertical line of "!" on the middle of the screen
; - displaying file's type (if managed, including subdir) and file's name
for all files of the page
; - displaying the cursor (video INVERSE) for the current selected name
; - adding BASIS.SYSTEM after the full SYS path
; - getting addr of the current selected name
; X=0
H10AC
JSR VTAB
INC
CV
; for next JSR VTAB
LDY
#20
; middle of txt screen
LDA #"!"
STA
(BASL),Y
; write separator (dir content/authors)
LDA
$61,X
; /BASIS.SYSTEM
H10B9
STA
SYS_LAUNCHER_LENGTH,X ; $0382,X ..
$0391,X (self-modifying code)
LDA
#%11111111
; display = NORMAL
CPX
SCREEN_POSITION
; cursor position?
BNE
H10CC
; no
LDA
PTR_WORK_NAME
; save pointer for current name
STA PTR_CURRENT_NAME
LDA PTR_WORK_NAME+1
STA PTR_CURRENT_NAME+1
LDA
#%00111111
; display = INVERSE
; acc=$FF (normal) or $3F (inverse)
H10CC
STA DISPLAY_MODE
LDY
#0
; get infos byte
LDA
(PTR_WORK_NAME),Y
; DTTTLLLL
BMI
H10EF
; sub-directory (D=1)
BNE
H10DD
; there's a file in this location
;
acc=0
LDY
#$10
; set ptr to "no name here" (empty location)
STA
(PTR_WORK_NAME),Y
; 1st byte=file/unknow type/len=0 = no file
TAY
; Y=0
BEQ
H10E4
; always
; Process a file
H10DD
LSR
; 0DTTTLLL
LSR
; 00DTTTLL
LSR
; 000DTTTL
LSR
; 0000DTTT
AND
#%00000111
; keep only type
TAY
; in Y
H10E4
LDA
LETTER_FILE_TYPE,Y ;
display internal file type on screen
LDY #0
STA (BASL),Y
INC
BASL
; next pos
BNE
H10FD
; always
; file is a subdirectory
H10EF
LDA #"
"
; don't display a file type here
STA (BASL),Y
INC BASL
INC
BASL
; x position+2
LDA
#"/"
; but display this character to identify a directory
AND
DISPLAY_MODE
; INVERSE (cursor) or NORMAL (not the cursor)
STA (BASL),Y
; Display file's name (+additional trailing spaces)
; Y=0 (always)
H10FD
LDA
(PTR_WORK_NAME),Y
; DTTTLLLL
AND
#%00001111
; 0000LLLL
STA
NAME_LENGTH
; save len of name
H1103
LDA #"
"
; trailing space. character used to erase previously written name
CPY NAME_LENGTH
INY
; next byte of the name (instr doesn't change carry)
BCS
H1110
; Y>=len. name is displayed. now complete with trailing space
LDA
(PTR_WORK_NAME),Y
; load character
ORA
#%10000000
; default = NORMAL
AND
DISPLAY_MODE
; INVERSE if requested for cursor
H1110
STA
(BASL),Y
; write character (or NORMAL space)
CPY
#17
; 17=1 (infos byte) + 1 (extra "/" for subdir) + 15 (name)
BNE
H1103
; not finished
; Prepare for next name
; carry=0
LDA
#$0F
; next name (ptr+16). if 20 names are now displayed, the work ptr=1st name
of the next page
ADC
PTR_WORK_NAME
; low
STA PTR_WORK_NAME
BCC H1120
INC
PTR_WORK_NAME+1
; high+1
H1120
INX
; next name
CPX
#20
; was it the last?
BCC
H10AC
; no, display next one
; In Bitsy Bye I use RdKey ($FD0C), but move the cursor offscreen first by
pointing BASH above the text page:
; ASL $29
; JSR $FD0C
;
; test with:
; 300:06 29 4c 0c fd
;
; I don't bother restoring the BASH afterward as Bitsy Bye does a VTAB
(which resets BASH) after each keypress
; and before characters are printed to the screen.
;
; -JB
; X=$14 (addr $14XX -> out of TXT screen)
STX
BASH
; not ASL but same effect
JSR RDKEY
; acc=key
CMP
#$8D
; return (=select)?
BNE
H11A8
; no
;--------------------------------
; Select a file/directory
;--------------------------------
JSR
MLI
; The ProDOS PREFIX is set to the directory containing the selected file
!8
SET_PREFIX
; (PATHNAME_LENGTH + PATHNAME)
!wo TBL_SET_PREFIX
BCS
H1191
; error
TAY
; acc=0, Y=0
LDA
(PTR_CURRENT_NAME),Y ; get
DTTTLLLL
BEQ
H11A2
; typeless file + no length => error
STY
TBL_READ+2
; read buffer =$2000
LDX #>$2000
H113F
STX TBL_READ+3
CMP
#$60
; test internal file type
AND
#%00001111
; 0000LLLL
BCS
H1174
; acc>=$60 (SYS+DIR)
;--------------------------------
; process INT or BIN or BAS or
; TXT or GS/OS pgm
;--------------------------------
; Y=0, acc=0000LLLL
STA
(PTR_CURRENT_NAME),Y ; store
length
INC
TBL_OPEN+2
; $02XX => $03XX (high) => SYS_LAUNCHER
DEY
; Y=$FF : max number of bytes of data to read (high)
; load single file
JSR
GET_CONTENT
; load BASIS.SYSTEM (built-in hook)
DEY
; MLI return code -1
BMI
H1164
; no error (BASIS.SYSTEM found and loaded)
; BASIS.SYSTEM not found
LDX
H10B9+1
; $82..$91
LDA
#"C"
; now BASIC.SYSTEM
STA SYS_LAUNCHER+1-$82+5,X
LDY
#$FF
; max number of bytes of data to read (high)
; load single file
H115C
JSR
GET_CONTENT
; read file BASIC.SYSTEM
DEC
TBL_OPEN+2
; $03XX => $02XX (high) => PTR_CURRENT_NAME
DEY
; MLI return code -1
BPL
H11A2
; error (unable to load BASIC.SYSTEM). Can't run the selected file.
; OK. BASIS.SYSTEM or BASIC.SYSTEM loaded at $2000
; https://prodos8.com/docs/techref/writing-a-prodos-system-program/
; Chapter 5.1.5
;
; There is a way to pass a second pathname to interpreters -- for example,
to language interpreters -- that
; like to run startup programs.
; Done by sophisticated program selectors.
;
; It requires that the interpreter start a certain way:
;
; $2000 is a jump instruction. $2003 and $2004 are $EE.
; If the interpreter starts this way, byte $2005 is assumed to indicate
the length of a buffer that starts
; at $2006 and holds the pathname (starting with a length byte) of the
startup file.
;
; Interpreters that support this mechanism should supply their own default
string, which should be a standard
; choice for a startup program or a flag not to run a startup program.
H1164
LDY
#$0F
; copy name + length
H1166
LDA (PTR_CURRENT_NAME),Y
STA
SYSTEM_ADDR+6,Y
; from $2006
DEY
BPL H1166
H116E
JSR HOME
JMP
SYSTEM_ADDR
; run BASIS.SYSTEM or BASIC.SYSTEM (and after that the selected file)
;--------------------------------
; Execute SYS or go DIR
;--------------------------------
; acc=0000LLLL
H1174
TAY
ADC
VOLNAME_LENGTH
; rem: carry=1 (=an additionnal character for "/" after pathname)
STA VOLNAME_LENGTH
TAX
; path length + selected name length + 1
H117A
LDA
(PTR_CURRENT_NAME),Y ; add
selected name to path
STA
PATHNAME-1,X
; if Y=0 acc=DTTTLLLL
DEX
DEY
BPL
H117A
; Y>=0
; Y=$FF
; acc=DTTTLLLL
ASL
; carry=D
LDA
#"/"
; add "/" before selected file name
STA PATHNAME,X
BCS
H11A5
; file is a directory. process it.
; SYS file
; Y=$FF max number of bytes of data to read (high)
; load single file
JSR
GET_CONTENT
; load it
TYA
; acc= mli return code
BEQ
H116E
; no err: run it
; unable to load SYS file
H1191
JSR BELL
;--------------------------------
; ESC
;--------------------------------
; Go to parent sub-directory or volume directory
;
; Example: current = /HD1/TOOLS (len=$0A)
;
; $0280: 0A AF 48 44 31 AF 54 4F
4F 4C 53
; "/" 'H' 'D'
'1' "/" 'T' 'O' 'O' 'L' 'S'
;
^
;
!
; ESC pressed
;
^
;
! stop here
;
; current = /HD1
; $0280: 04 AF 48 44 31
HANDLE_ESC
H1194
LDY VOLNAME_LENGTH
H1196
LDA
(TBL_OPEN+1),Y
; acc = volume name character
DEY
; length-1
BEQ
H11A2
; can't esc: already root level
; but display files list from 1st name
; esc can be processed
TAX
; test character
BPL
H1196
; 'character'
; "character" <=> found "/"
STY
VOLNAME_LENGTH
; set new length
BMI
H11A5
; always. go read parent dir
;--------------------------------
; Error subroutine
;--------------------------------
H11A2
JSR BELL
H11A5
JMP H1065
;--------------------------------
H11A8
LDX SCREEN_POSITION
; acc=key
CMP
#$95
; "right" arrow?
BNE
H11E5
; no
;--------------------------------
; Go down
;--------------------------------
; In
; X : screen location
[0..19]
HANDLE_DOWN
H11AE
INX
; screen location+1
LDY
#16
; is next location empty?
LDA (PTR_CURRENT_NAME),Y
BEQ
H11D1
; yes. can't go down
; can go down
; but where is the cursor?
CPX
#$0A
; cursor was on the middle of the screen?
BCC
H120E
; no. save screen position (X) and go to display routine (JMP H1081).
; middle of the screen
; need to scroll down if 20 names on screen
; 1 name=16 byte. 20 names on the screen. 20*16=$0140=$0100+$40
INC PTR_1ST_NAME_ON_SCREEN+1 ;
change temporarily : high+1 <=> +$100
LDY
#$40
; +$40
LDA (PTR_1ST_NAME_ON_SCREEN),Y ; load
DEC PTR_1ST_NAME_ON_SCREEN+1 ;
rollback change
TAY
; DTTTLLLL
BEQ
H120E
; 0 means "less than 20 files on screen".
; no scroll down. save screen position (X++)
; go to the display routine and move cursor down
; filenames list : scroll down required
LDA
PTR_1ST_NAME_ON_SCREEN ; pointer (low)
LDY PTR_1ST_NAME_ON_SCREEN+1
ADC
#$0F
; low+16
BCC
H11CD
; no action for high
INY
; high+1
H11CD
STA
PTR_1ST_NAME_ON_SCREEN ; set new ptr
STY PTR_1ST_NAME_ON_SCREEN+1 ;
scroll up/down with screen refresh
H11D1
JMP
H1083
; don't save screen position (X++)
; go screen refresh
;--------------------------------
; Change slot
;--------------------------------
; in
; acc : $F9..$FF (key "1".."7")
; carry : 1
;
; Bitsy Bye uses keys 1-7 as slot keys with subsequent presses toggling
the drive number at that slot.
; -JB
HANDLE_CHANGE_SLOT
H11D4
EOR
#%11111000
; $01..$07
ROL
; $03..$0F (carry in bit
0)
TAX
; 0000SSS1 (!D=1 => D=0 : drive 1 default)
; retrieve current drive code
EOR
CUR_SLOT_DRV
; 0000SSS? (?=!D)
; bit 0 : 1 EOR 0 = 1 (!D=0 => D=1 current=drive 2)
; bit 0 : 1 EOR 1 = 0 (!D=1 => D=0 current=drive 1)
LSR
; bit 0 in carry.
; carry=0 => bit 0 = 0 (current drive=drive 1)
; carry=1 => bit 0 = 1 (current drive=drive 2)
; (selected slot) EOR (current slot):
; 1 EOR 1 = 0
; 0 EOR 0 = 0
; if same slot acc=0
BNE
H11E0
; not same slot. begin with drive 1 (default)
; same slot
BCS
H11E0
; carry=1 : current=drive 2. toggle: drive 1 required (keep default)
DEX
; 0000SSS0 : !D=0 => D=1 (drive 2 required)
H11E0
JSR
GET_VOLUME_NAME
; get volume
BPL
H11A5
; always. JMP H1065 (go read content)
;--------------------------------
H11E5
CMP
#$9B
; esc?
BEQ
HANDLE_ESC
; yep
CMP #"A"
BCS
HANDLE_FIRST_LETTER ; acc
>= "A"
; carry=0
ADC #$48
CMP
#"y"
; test : $B1+$48..$B7+$48
; acc >= $F9
BCS
HANDLE_CHANGE_SLOT ;
yep: "1".."7"
; carry=0
SBC
#$CF
; <=> -$D0
; acc+$48-$D0=0 <=> acc=$D0-$48=$88
BEQ
HANDLE_UP
; ^H (left arrow)
TAY
DEY
; acc+$48-$D0-1=0 <=> acc=$89
BEQ
HANDLE_TAB
; ^I (TAB)
DEY
; acc=$8A?
BEQ
HANDLE_DOWN
; ^J (down arrow)
DEY
; acc=$8B? ^K (up arrow)
BNE
H11D1
; no : JMP H1083
;--------------------------------
; Go up
;--------------------------------
; In
; X : screen location
[0..19]
HANDLE_UP
; check if not already the 1st name of the directory/volume
H1201
LDY PTR_1ST_NAME_ON_SCREEN+1
LDA PTR_1ST_NAME_ON_SCREEN
BNE
H1211
; if low <> 0 when can't be $1400, so we can go up
; low=$00
CPY
#>H1400
; high=$14?
BNE
H1211
; no, can go up
; already at the top of the screen
; X=0
H120B
DEX
; screen position-1.
; if X=$FF, DEX used only to branch to H11D1 (H1083)
H120C
BMI
H11D1
; always if top of screen. don't save X in screen position
H120E
JMP
H1081
; save X to screen position
; the cursor can move up
H1211
CPX
#$0A
; cursor current pos>=middle of the screen+1?
BCS
H120B
; yes. don't need to scroll up the list. DEX=cursor up.
; filenames list : scroll up required
; carry=0
SBC
#$0F
; ptr low -16. pointer on previous name
BCS
H11CD
; ptr high ok
DEY
; ptr high-1
BCC
H11CD
; always
;--------------------------------
; Scan for another volume
;--------------------------------
; slot DESC (7 -> 6 -> 5 -> 4 -> 3 -> 2 -> 1 -> 0
-> 7 -> etc...)
; drive ASC (1 -> 2 -> 1 & slot-1 -> 2 -> etc...)
HANDLE_TAB
H121C
LDX
CUR_SLOT_DRV
; 0000SSS? (?=!D)
JMP
H105F
; DEX done before calling GET_VOLUME_NAME:
; if drive 1 (!D=1) then try drive 2 (!D1=0)
; if drive 2 (!D=0) then try slot-1, drive 1 (!D=1)
; if slot-1=$FF than AND #$0F set slot 7, drive 1 (!D=1)
;--------------------------------
; First name beginning with
; letter
; If found, become the 1st
; filename displayed on the
; screen
;--------------------------------
; In
; acc : "letter"
; feature: Allows files to be selected by typing the first letter of their
filename
;
; Notes:
; - search from the current cursor position.
; - If not found, try again from the beggining of the list.
; - If still not found (no filename starts with that letter), the cursor
doesn't move.
HANDLE_FIRST_LETTER
H1221
AND
#%01011111
; "letter" to 'letter' for comparison
STA FIRST_CHARACTER
; 1st attempt (X=1) : from current cursor position
LDX #0
LDY
PTR_CURRENT_NAME
; init Y with current ptr low
STX
PTR_CURRENT_NAME
; and set current ptr low=0
INX
; X=1
H122C
TYA
; acc=ptr low
CLC
; +16. next filename
ADC
#$10
; carry=1 if ptr high+1 required
TAY
; Y=ptr low+16. no effect on carry
BCC
H1235
; ptr high OK
INC
PTR_CURRENT_NAME+1 ;
ptr high+1
; Y=0
H1235
LDA
(PTR_CURRENT_NAME),Y ; load
DTTTLLLL
BEQ
H124A
; end of list
INY
; pos=1st letter of the filename
LDA
(PTR_CURRENT_NAME),Y ; load 1st
letter
DEY
; pos=DTTTLLLL
CMP
FIRST_CHARACTER
; key pressed?
BNE
H122C
; no, not the same letter
; found. start list with that name
STY PTR_1ST_NAME_ON_SCREEN
LDA PTR_CURRENT_NAME+1
STA PTR_1ST_NAME_ON_SCREEN+1
JMP
H107B
; refresh display
; acc=0
H124A
DEX
; another try?
;
; X=$FF?
BMI
H120C
; yes. 2 fails. stop now. rebuild PTR_CURRENT_NAME ptr
; with SCREEN_POSITION
; 2nd attemp (X=0): retry from the beginning of the list
TAY
; Y=0. ptr low=0
LDA
#>H1400
; set ptr high = $14
STA PTR_CURRENT_NAME+1
BNE
H1235
; always
;--------------------------------
; Get volume name
;--------------------------------
; In
; X : 000DSSS? (?=!D) 1st
entry : "D" is erased by TAX+AND #$0F
; : 0000SSS?
(?=!D) others
; Out
; $56 : CUR_SLOT_DRV fmt=0000SSS?
(?=!D)
; $57 : VOLNAME_LENGTH = volume name
length+1
; $0281 : "/" remplace PATHNAME's length
; $0282..$0290 : PATHNAME
; $0380 : SYS_LAUNCHER_LENGTH = full length :
length("/BASIS.SYSTEM")=$0D + 1st "/" = $0E
;
$0E : if name length=0
;
$0F : if name length=1
;
$10 : if name length=2
;
$11 : if name length=3
;
$12 : if name length=4
;
$13 : if name length=5
;
$14 : if name length=6
;
$15 : if name length=7
;
$16 : if name length=8
;
$17 : if name length=9
;
$18 : if name length=10 ($0A)
;
$19 : if name length=11 ($0B)
;
$1A : if name length=12 ($0C)
;
$1B : if name length=13 ($0D)
;
$1C : if name length=14 ($0E)
;
$1D : if name length=15 ($0F)
; $10BA : name length $82..$91
; Y : name length
; acc : name length $82..$91
;
$82 : if name length=0
;
$83 : if name length=1
;
$84 : if name length=2
;
$85 : if name length=3
;
$86 : if name length=4
;
$87 : if name length=5
;
$88 : if name length=6
;
$89 : if name length=7
;
$8A : if name length=8
;
$8B : if name length=9
;
$8C : if name length=10 ($0A)
;
$8D : if name length=11 ($0B)
;
$8E : if name length=12 ($0C)
;
$8F : if name length=13 ($0D)
;
$90 : if name length=14 ($0E)
;
$91 : if name length=15 ($0F)
; X : unchanged
GET_VOLUME_NAME
H1254
TXA
AND
#%00001111
; get slot 0000SSS?
STA
CUR_SLOT_DRV
; save as current
LSR
; 00000SSS
; !D in carry
BEQ
H127C
; slot 0: not a valid ProDOS device (LLLL=0)
H125C
PHP
; save !D (carry)
H125D
ORA #"0"
H125F
STA
TXT_LINE0+1
; write slot on TXT screen
H1262
ASL
; 0000SSS0
ASL
; 000SSS00
ASL
; 00SSS000
H1265
ASL
; 0SSS0000
H1266
PLP
; restore !D (carry)
LDY
#"1"
; drive "1"
H1269
BCS
H126E
; carry=1 => !D=1 => D=0 (drive 1)
; carry=0 => !D=0 => D=1 (drive 2)
H126B
ORA
#%10000000
; 1SSS0000
INY
; drive "2"
; Y=drive ("1"/"2")
; acc=DSSS0000
H126E
STA
TBL_ONLINE+1
; unit number for ONLINE
H1270
STY
TXT_LINE0+4
; write drive on TXT screen
JSR
MLI
; identity single volume (unit number)
!8
ONLINE
; fill PATHNAME (16 bytes)
!8
TBL_ONLINE,0
; table in zero page
LDA
PATHNAME
; DSSSLLLL
H127C
LDY
#"/"
; replace DSSSLLL by "/"
STY PATHNAME
AND
#%00001111
; 0000LLLL (volume name length) $00..$0F
TAY
; Y=length
CLC
ADC
#$0E
; $0E..$1D
STA SYS_LAUNCHER_LENGTH
ADC
#$74
; $82..$91
STA
H10B9+1
; low
INY
; Y=length+1
STY VOLNAME_LENGTH
DEY
; Y=length. if length=0, Z=1
RTS
;--------------------------------
; Get a content
;--------------------------------
; In
; VOLNAME_LENGTH : path length+1
; PATHNAME
;
Y
: max number of bytes of data to read (high)
;
$00 : load the content of a volume/directory
;
$FF : load a file
;
; Out
; Y : MLI code return
("OPEN" if KO otherwise "READ")
; acc : MLI code return ("CLOSE")
; $1400..$???? structures buffer:
; 16 bytes :
1st structure
; 16 bytes :
2st structure
; ...
;
; structure
infos (BB 2.4.2):
;
$00 : format DTTTLLLL (infos byte)
;
D : 0=file, 1=subDirectory
;
TTT : internal file type
;
0=not managed type, 1=INT, 2=BIN, 3=BAS, 4=TXT, 5=GS/OS app pgm, 6=SYS
;
TTT=0 if D=1
;
LLLL : name length
;
$01..$0F : name
; PATHNAME_LENGTH : length including "/"
;
;
; Feature: Does not abort on drive errors, but instead lists and allows
launching of all readable files
;
; I intend to open source Bitsy Bye along with several new drivers as part
of ProDOS 2.5.
; The issue is that Bitsy Bye 2.4 is parsing directories in a way that is
incompatible with ProDOS 2.5, so I want to hold off sharing that version.
; Once the new 2.5 system is in place, it will be ready for sharing,
customizing, and migrating into other apps.
; -JB
GET_CONTENT
H1294
LDA
VOLNAME_LENGTH
; name length+1 (including "/")
STA PATHNAME_LENGTH
JSR
MLI
; open name
!8 OPEN
!8
TBL_OPEN,0
; table in zero page
BCS
H12F3
; error
LDA
TBL_OPEN+5
; reference number (OPEN)
STA
TBL_READ+1
; set ref number (READ)
; Y=$00 or $FF
STY
TBL_READ+5
; max number of bytes of data to read (high)
LDA
#$2B
; size of volume directory/subdirectory header
LDX
#$0D
; nbr of file descriptive entries in 1 block
; (volume header + 12 files)
!8
$2C
; BIT trick (hide size below)
H12AC
LDA
#$27
; size of file descriptive entry
DEX
; nbr-1
BNE H12B5
; process last name of the block
; note : 1 block = $2B + 12*$27 = $1FF
; +extra $00 at the end of the block
LDA
#$2C
; read $27 + extra $00 + 4 bytes of next block (next/previous block
pointers)
LDX
#$0D
; loop for 13 entries
; if no "next" block: actual length=$28+mli return code $4C
; but no err => BB tries to read next & fail
H12B5
STA
TBL_READ+4
; max number of bytes of data to read (low)
JSR
MLI
; read
!8 READ
!8
TBL_READ,0
; table in zero page
INY
; Y=$FF+1? If Y=0 => file loaded
BEQ
H12F3
; stop reading
; processing a directory (not a
file)
LSR
TBL_READ+6
; actual number of bytes placed in buffer (low)
BEQ
H12F3
; EOF : stop reading
; Note : if there's no file then the 1st byte of the corresponding
structure is always set to 0.
; it's mandatory for the display
routine and the cursor movement.
TAY
; Y=0
LDA
(TBL_READ+2),Y
; read 1st byte of buffer
AND
#%10001111
; keep vol/dir bit + name length
STA (TBL_READ+2),Y
ASL
; remove vol/dir bit 000LLLL0
BEQ
H12AC
; file is deleted (LLLL=0) or no file here. skip it
LDY #$10
LDA
(TBL_READ+2),Y
; get file type
LDY
#7
; loop for known file types list+1
H12D4
DEY
BEQ
H12DC
; Y=0 : was last (file type not in the list)
CMP
FILE_TYPE_LIST-1,Y ;
file type in list?
BNE
H12D4
; not this one. Check another one.
; Y : 1..6
H12DC
TYA
; acc = 00000TTT type index (TTT=0=not managed)
ASL
ASL
ASL
ASL
; acc = 0TTT0000
LDY
#0
; merge type index and
ORA
(TBL_READ+2),Y
; vol/dir bit (7) + LLLL (bits 3..0)
STA
(TBL_READ+2),Y
; format DTTTLLLL
; directory: D=1 TTT=0
LDA
TBL_READ+2
; buffer addr (low) for next name
ADC
#$10
; +16 bytes
STA TBL_READ+2
BCC
H12AC
; same mem page. next name.
INC
TBL_READ+3
; buffer addr (high) +1
BNE
H12AC
; always. next name.
; close everything
H12F3
TAY
; Y=MLI return code (err if <> 0)
JSR MLI
!8 CLOSE
!wo TBL_CLOSE
RTS
;--------------------------------
; Table for MLI CLOSE
;--------------------------------
TBL_CLOSE
H12FB
!8
1
; parameter count
!8
0
; close all files
;--------------------------------
; Table for MLI SET_PREFIX
;--------------------------------
TBL_SET_PREFIX
H12FD
!8 1
!wo PATHNAME_LENGTH
;--------------------------------
; TXT screen datas
; read from H1356 to H1300 desc
;--------------------------------
; X: 1..40
; Y: 0..23
; end of screen datas
H1300
!tx
"-"
; not printed on screen in this loop
!8
22,41
; coord: X=41(out of screen),Y=22
!tx "BITSY BYE"
!8
5,36
; coord: X=36,Y=5
!tx "BY"
!8
10,32
; coord: X=32,Y=10
; WTF!!! Authors name... in plain text!
; No tricks, no crazy encoding routine, even not a small EOR or inverted
names!
; I'm very disappointed!
!tx "J.BROOKS"
!8
15,35
; coord: X=35,Y=15
!tx "P.FERRIE"
!8
18,35
; coord: X=35,Y=18
!tx "RETURN:SELECT"
!8
23,13
; coord: X=13,Y=23
!tx "ESC:BACK"
!8
23,24
; coord: X=24,Y=23
!tx "TAB,#:NEW VOL"
!8
23,40
; coord: X=40,Y=23
; $59..$60
H134F
!tx "S6,D1:"
!8
0
; coord: Y=0
H1356
!8
6
; coord: X=6
; beginning of screen
datas
;--------------------------------
; Relocated in zero page $61..$6D
;--------------------------------
; John Brooks at KansasFest 2017
; https://youtu.be/Sm4D1wtWPck?t=957
; BASIS.SYSTEM
;
; - Could 'smart launch' at boot or from Bisty Bye
; - Called by Bitsy Bye for non-SYS file types
; - Could map file/aux type to launch app path
; - If not found, Bitsy Bye will use BASIC.SYSTEM
; Chris Torrence : Assembly Lines #41 : ProDOS 2.4.1 Easter Egg
; https://www.youtube.com/watch?v=-_6P_a5C4Z0
; $61
!tx "/BASIS.SYSTEM"
;--------------------------------
; Relocated in zero page $6E..$71
;--------------------------------
; TBL_ONLINE
; $6E
!8
2
; parameter count
; $6F
!8
$00
; unit number DSSS0000
; $70..$71
!wo
PATHNAME
; 16 bytes buffer : $0281..$0290
;--------------------------------
; Relocated in zero page $72..$77
;--------------------------------
; TBL_OPEN
!8
3
; parameter count
; $73..$74
!wo
PATHNAME_LENGTH
; addr of pathname $0280 (len) $0281..$02BF (name)
; $75..$76
!wo
$0B00
; addr of filebuffer $0B00..$0EFF
; $77
!8
$00
; reference number
;--------------------------------
; Relocated in zero page $78
;--------------------------------
; TBL_READ
; $78
!8
4
; parameter count
; $79 : reference number (TBL_READ+1)
; $7A-$7B : addr of data buffer (TBL_READ+2/TBL_READ+3)
; $7C-$7D : requested length (TBL_READ+4/TBL_READ+5)
; $7E-$7F : actuel length // returned value (TBL_READ+6/TBL_READ+7)
;--------------------------------
; ProDOS file type known by BB
;--------------------------------
FILE_TYPE_LIST
H136F
!8
$FA
; INT
!8
$06
; BIN
!8
$FC
; BAS
!8
$04
; TXT
!8
$B3
; GS/OS app pgm (S16)
!8
$FF
; SYS
;--------------------------------
; Letter for ProDOS file type
;--------------------------------
LETTER_FILE_TYPE
H1375
!tx "
"
; unsupported file type
!tx
"I"
; Integer BASIC
!tx
"B"
; Binary
!tx
"A"
; AppleSoft BASIC
!tx
"T"
; Text
!tx
"-"
; GS/OS app pgm (S16)
!tx
"-"
; SYS