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Analyze NS.CLOCK.SYSTEM to understand chaining

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This commit is contained in:
Joshua Bell 2017-11-25 14:36:48 -08:00
parent c6e7cb4c7c
commit 99e4d15a12
3 changed files with 732 additions and 1 deletions
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2
Makefile
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@ -3,7 +3,7 @@ CC65 = ~/dev/cc65/bin
CAFLAGS = --target apple2enh --list-bytes 0
CCFLAGS = --config apple2-asm.cfg
TARGETS = cricket.system.SYS prodos.mod.BIN
TARGETS = cricket.system.SYS prodos.mod.BIN test.system.SYS ns.clock.system.SYS
.PHONY: clean all
all: $(TARGETS)

711
ns.clock.system.s Normal file
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@ -0,0 +1,711 @@
.setcpu "65C02"
CR := $8D
BELL := $87
MAX_DW := $FFFF
;; Softswitches
KBD := $C000 ; Last Key Pressed + 128
KBDSTRB := $C010 ; Keyboard Strobe
CLR80VID := $C00C ; 40 Columns
CLRALTCHAR := $C00E ; Primary Character Set
ROMIN2 := $C082 ; Read ROM; no write
RWRAM1 := $C08B ; Read/write RAM bank 1
;; ProDOS Equates
PRODOS := $BF00
DATETIME := $BF06
DEVNUM := $BF30
BITMAP := $BF58
DATELO := $BF90
TIMELO := $BF92
MACHID := $BF98
SYS_ADDR := $2000
PATHNAME := $0280
MLI_QUIT := $65
MLI_READ_BLOCK := $80
MLI_OPEN := $C8
MLI_READ := $CA
MLI_CLOSE := $CC
.macro PRODOS_CALL call, params
jsr PRODOS
.byte call
.addr params
.endmacro
;; Monitor Equates
INIT := $FB2F
MON_HOME := $FC58
CROUT := $FD8E
PRBYTE := $FDDA
COUT := $FDED
SETNORM := $FE84
SETKBD := $FE89
SETVID := $FE93
.macro HIASCII arg
.repeat .strlen(arg), i
.byte .strat(arg, i) | $80
.endrep
.endmacro
;;; --------------------------------------------------
.org $1000
;; Loaded at $2000 but relocates to $1000
;;; --------------------------------------------------
init: sec
bcs :+
.byte $04, $21, $91 ; ????
;;; --------------------------------------------------
.proc relocate
src := SYS_ADDR
dst := $1000
: ldx #5 ; pages
ldy #0
load: lda src,y ; self-modified
store: sta dst,y ; self-modified
iny
bne load
inc load+2
inc store+2
dex
beq find_self_name
jmp load
.endproc
;;; --------------------------------------------------
;; Search pathname buffer backwards for '/', then
;; copy name into |self_name|; this is used later
;; to find/invoke the next .SYSTEM file.
.proc find_self_name
;; find '/' (which may not be present, prefix is optional)
lda #0
sta $A8
ldx PATHNAME
beq L1046
floop: inc $A8
dex
beq copy
lda PATHNAME,x
eor #'/'
asl a
bne floop
;; copy name into |self_name| buffer
copy: ldy #0
cloop: iny
inx
lda PATHNAME,x
sta self_name,y
cpy $A8
bcc cloop
sty self_name
.endproc
;;; --------------------------------------------------
L1046: cld
bit ROMIN2
lda #$46
sta $03F2
lda #$10
sta $03F3
eor #$A5
sta $03F4
lda #$95
jsr COUT
ldx #$FF
txs
sta CLR80VID
sta CLRALTCHAR
jsr SETVID
jsr SETKBD
jsr SETNORM
jsr INIT
ldx #$17
lda #$01
L1077: sta BITMAP,x
lda #$00
dex
bne L1077
lda #$CF
sta BITMAP
lda MACHID
and #$88
bne L1090
lda #$DF
sta cout_mask ; lower case to upper case
L1090: lda MACHID
and #$01
beq L10BD
jsr MON_HOME
jsr zstrout
.byte CR
HIASCII "Previous Clock Installed!"
.byte BELL
.byte CR
.byte 0
jmp exit
L10BD: ldy #$03
L10BF: lda DATELO,y
sta L1197,y
dey
bpl L10BF
lda #$CF
ldy #$FF
sta L1403
sty L1402
sta L1470
sty L146F
lda #$00
sta L119C
lda #$03
L10DF: ora #$C0
sta L1407
L10E4: sta L140A
sta L1419
sta L1427
lda #$03
sta L119B
L10F2: jsr L13FF
lda DATELO+1
ror a
lda DATELO
rol a
rol a
rol a
rol a
and #$0F
beq L1128
cmp #$0D
bcs L1128
lda DATELO
L110B: and #$1F
beq L1128
cmp #$20
bcs L1128
.byte $AD
.byte $93
L1115: bbs3 $C9,$1130
bcs L1128
lda TIMELO
cmp #$3C
bcs L1128
dec L119B
bne L10F2
.byte $F0
L1127: .byte $75
L1128: inc L119C
lda L119C
cmp #$08
bcc L10DF
bne L1151
lda #$C0
ldy #$15
sta L1403
sty L1402
ldy #$07
sta L1407
sty L1406
dey
sta L1470
sty L146F
lda #$C8
bne L10E4
L1151: ldy #$03
L1153: lda L1197,y
sta DATELO,y
dey
bpl L1153
jsr MON_HOME
jsr zstrout
.byte CR
HIASCII "No-SLot Clock Not Found."
.byte CR
.byte CR
HIASCII "Clock Not Installed!"
.byte BELL
.byte CR
.byte 0
jmp exit
L1197: .byte 0, 0, 0, 0
L119B: .byte $03
L119C: brk
;;; --------------------------------------------------
L119D: lda DATETIME+1
sta $A5
clc
adc #$73
sta L140E
lda DATETIME+2
sta $A6
adc #$00
sta L140F
lda RWRAM1
lda RWRAM1
ldy #$7C
L11BA: lda L13FF,y
sta ($A5),y
dey
bpl L11BA
lda MACHID
ora #$01
sta MACHID
lda #$4C ; JMP opcode
sta DATETIME
jsr DATETIME
bit ROMIN2
jsr MON_HOME
jsr zstrout
.byte CR
HIASCII "No-Slot Clock Installed "
.byte 0
lda DATELO+1
ror a
pha
lda DATELO
pha
rol a
rol a
rol a
rol a
and #$0F
jsr L1347
lda #$AF
jsr COUT
pla
and #$1F
jsr L1347
lda #$AF
jsr COUT
pla
jsr L1347
jsr CROUT
;;; --------------------------------------------------
;; Twiddle reset vector?
exit:
lda #$65
sta $03F2
lda #$13
sta $03F3
eor #$A5
sta $03F4
;;; --------------------------------------------------
;;; Invoke next .SYSTEM file
.define SYSTEM_SUFFIX ".SYSTEM"
lda DEVNUM
sta read_block_params_unit_num
jsr read_block
lda $1823
sta L128C
lda $1824
sta L1298
lda #$01
sta $A7
lda #$2B
sta $A5
lda #$18
sta $A6
L124F: ldy #$10
lda ($A5),y
cmp #$FF ; type=SYS ???
bne L1288
ldy #$00
lda ($A5),y
and #$30
beq L1288
lda ($A5),y
and #$0F
sta $A8
tay
;; Compare suffix - is it .SYSTEM?
ldx #.strlen(SYSTEM_SUFFIX)-1
L1268: lda ($A5),y
cmp suffix,x
bne L1288
dey
dex
bpl L1268
ldy self_name
cpy $A8
bne L12BE
: lda ($A5),y
cmp self_name,y
bne L12BE
dey
bne :-
sec
ror found_self_flag
;; go on to next file (???)
L1288: lda $A5
clc
.byte $69
L128C: rmb2 $85
lda $90
.byte $02
inc $A6
inc $A7
lda $A7
.byte $C9
L1298: ora $B490
lda $1802
sta read_block_params_block_num
lda $1803
sta read_block_params_block_num+1
ora read_block_params_block_num
beq L12E6
jsr read_block
lda #$00
sta $A7
lda #$04
sta $A5
lda #$18
sta $A6
jmp L124F
L12BE: bit found_self_flag
bpl L1288
ldx PATHNAME
beq L12D3
L12C8: dex
beq L12D3
lda PATHNAME,x
eor #'/'
asl a
bne L12C8
L12D3: ldy #$00
L12D5: iny
inx
L12D7: lda ($A5),y
sta PATHNAME,x
cpy $A8
bcc L12D5
stx PATHNAME
jmp invoke_system_file
L12E6: jsr zstrout
.byte CR
.byte CR
.byte CR
HIASCII "* Unable to find next '.SYSTEM' file *"
.byte CR
.byte 0
bit KBDSTRB
: lda KBD
bpl :-
bit KBDSTRB
jmp quit
;;; --------------------------------------------------
;;; Output a high-ascii, null-terminated string.
;;; String immediately follows the JSR.
.proc zstrout
pla
sta $A5
pla
sta $A6
bne L1334
L132A: cmp #('a'|$80) ; lower-case?
bcc :+
and cout_mask ; make upper-case if needed
: jsr COUT
L1334: inc $A5
bne L133A
inc $A6
L133A: ldy #$00
lda ($A5),y
bne L132A
lda $A6
pha
lda $A5
pha
rts
.endproc
;;; --------------------------------------------------
L1347: ldx #$B0
cmp #$0A
bcc L1354
L134D: sbc #$0A
inx
cmp #$0A
bcs L134D
L1354: pha
cpx #$B0
beq L135D
txa
L135A: jsr COUT
L135D: pla
ora #$B0
jsr COUT
rts
cout_mask:
.byte $FF
;;; --------------------------------------------------
.proc quit
PRODOS_CALL MLI_QUIT, quit_params
.byte 0 ; ???
rts
.proc quit_params
.byte 4 ; param_count
.byte 0 ; quit_type
.word 0000 ; reserved
.byte 0 ; reserved
.word 0000 ; reserved
.endproc
.endproc
;;; --------------------------------------------------
.proc read_block
PRODOS_CALL MLI_READ_BLOCK, read_block_params
bcs on_error
rts
.endproc
.proc read_block_params
.byte 3 ; param_count
unit_num: .byte $60 ; unit_num
.addr $1800 ; data_buffer
block_num: .word 2 ; block_num
.endproc
read_block_params_unit_num := read_block_params::unit_num
read_block_params_block_num := read_block_params::block_num
;;; --------------------------------------------------
;;; Load/execute the system file in PATHNAME
.proc invoke_system_file
PRODOS_CALL MLI_OPEN, open_params
bcs on_error
lda open_params_ref_num
sta read_params_ref_num
PRODOS_CALL MLI_READ, read_params
bcs on_error
PRODOS_CALL MLI_CLOSE, close_params
bcs on_error
jmp SYS_ADDR ; Invoke loaded SYSTEM file
.endproc
;;; --------------------------------------------------
;;; Error Handler
.proc on_error
pha
jsr zstrout
.byte CR
.byte CR
.byte CR
HIASCII "** Disk Error $"
.byte 0
pla
jsr PRBYTE
jsr zstrout
HIASCII " **"
.byte CR
.byte 0
bit KBDSTRB
: lda KBD
bpl :-
bit KBDSTRB
jmp quit
.endproc
;;; --------------------------------------------------
.proc open_params
.byte 3 ; param_count
.addr PATHNAME ; pathname
.addr $1800 ; io_buffer
ref_num:.byte 1 ; ref_num
.endproc
open_params_ref_num := open_params::ref_num
.proc read_params
.byte 4 ; param_count
ref_num:.byte 1 ; ref_num
.addr SYS_ADDR ; data_buffer
.word MAX_DW ; request_count
.word 0 ; trans_count
.endproc
read_params_ref_num := read_params::ref_num
.proc close_params
.byte 1 ; param_count
ref_num:.byte 0 ; ref_num
.endproc
;;; --------------------------------------------------
found_self_flag:
.byte 0
suffix: .byte SYSTEM_SUFFIX
self_name:
.byte $F, "NS.CLOCK.SYSTEM"
;;; --------------------------------------------------
L13FF: php
sei
.byte $AD
L1402: .byte $FF
L1403: bbs4 $48,$1393
L1406: brk
L1407: .byte $C3
.byte $AD
.byte $04
L140A: .byte $C3
ldx #$08
L140D: .byte $BD
L140E: .byte $72
L140F: trb $38
ror a
L1412: pha
lda #$00
rol a
tay
.byte $B9
brk
L1419: .byte $C3
pla
lsr a
bne L1412
dex
bne L140D
ldx #$08
L1423: ldy #$08
L1425: .byte $AD
.byte $04
L1427: .byte $C3
ror a
ror $01FF,x
dey
bne L1425
lda $01FF,x
lsr a
lsr a
lsr a
lsr a
tay
beq L1447
lda $01FF,x
and #$0F
clc
L143F: adc #$0A
dey
bne L143F
.byte $9D
L1445: .byte $FF
.byte $01
L1447: dex
bne L1423
lda $0204
sta TIMELO+1
lda $0205
sta TIMELO
lda $0201
asl a
asl a
asl a
asl a
asl a
ora $0202
sta DATELO
lda $0200
rol a
sta DATELO+1
pla
bmi L1471
.byte $8D
L146F: .byte $FF
L1470: .byte $CF
L1471: plp
rts
.byte $5C
.byte $A3
dec a
cmp $5C
.byte $A3
dec a
cmp $00
.byte $B3
pla
adc ($F0)
.res 6, $2a
.byte " /RAM ", $8D, $00
.res 12, $2a
.byte " /CONTIERI ", $8D, $00
.res 7, $2a
.byte $03, "/HD ", $8D, $00
.res 27, $2a
.byte $6a, $2d
.res 19, $2a
.byte $31, $f0, $03, $4c, $43, $3a, $ad, $3e
.res 7, $2a
L14F4: .res 2, $2a
L14F6: .res 99, $2a
L1559: .res 12, $2a
.byte $CA, $FC, $30, $F0, $07, $C9, $4C, $F0
.res 120, $2a
.byte 0, 0, 0
lda $3150
bne L15EE
; 000005e0 2a 2a 2a 2a 2a 00 00 00 ad 50 31 d0 01 2a 2a 2a |*****....P1..***|
; 000005f0 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a |****************|
.byte $2a
L15EE: .res 18, $2a

20
test.system.s Normal file
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@ -0,0 +1,20 @@
.setcpu "6502"
.include "apple2.inc"
.org $2000 ; System files start at $2000
;; ProDOS System Global Page
PRODOS := $BF00 ; MLI entry point
.proc install
rts
parmtable:
.byte 4 ; Number of parameters is 4
.byte 0 ; 0 is the only quit type
.word 0000 ; Pointer reserved for future use
.byte 0 ; Byte reserved for future use
.word 0000 ; Pointer reserved for future use
.endproc