716 lines
18 KiB
ArmAsm
716 lines
18 KiB
ArmAsm
;;; Disassembly of "RAM.SYSTEM" found on Mouse Desk 2.0 images
|
|
;;; Based on Glen E. Bredon's "RAM.DRV.SYSTEM"
|
|
;;; Some details c/o http://boutillon.free.fr/Underground/Outils/Ram_Drv_System/Ram_Drv_System.html
|
|
;;;
|
|
;;; Modifications:
|
|
;;; * Chain to next .SYSTEM file dynamically
|
|
|
|
.setcpu "6502"
|
|
.linecont +
|
|
.feature string_escapes
|
|
|
|
.include "apple2.inc"
|
|
.include "apple2.mac"
|
|
.include "opcodes.inc"
|
|
|
|
.include "../inc/apple2.inc"
|
|
.include "../inc/macros.inc"
|
|
.include "../inc/prodos.inc"
|
|
|
|
;;; ************************************************************
|
|
.include "../inc/driver_preamble.inc"
|
|
;;; ************************************************************
|
|
|
|
;;; ============================================================
|
|
;;;
|
|
;;; Driver Installer
|
|
;;;
|
|
;;; ============================================================
|
|
|
|
;;; ============================================================
|
|
;;; Configuration Parameters
|
|
|
|
.undef PRODUCT
|
|
.define PRODUCT "RAMWorks RAM Disk"
|
|
|
|
zp_sig_addr := $06
|
|
|
|
zpproc_addr := $B0
|
|
zpproc_relay_addr := $2D0
|
|
|
|
driver_target := $FF00 ; Install location in ProDOS
|
|
|
|
|
|
kMaxUsableBanks = 24 ; Why is this capped so low???
|
|
; (driver has room for another ~20?)
|
|
|
|
banks_to_reserve: .byte 0 ; banks to reserve (e.g. for AppleWorks)
|
|
unitnum: .byte $03 ; S3D1; could be $B for S3D2
|
|
|
|
;;; ============================================================
|
|
;;; Install the driver
|
|
|
|
.proc maybe_install_driver
|
|
|
|
sta CLR80COL
|
|
ldy #0
|
|
sty BANKSEL
|
|
sta ALTZPON ; Use ZP to probe banks
|
|
|
|
;; Clear map1 / map2 (256 bytes) to $FF
|
|
lda #$FF
|
|
: sta map1,y
|
|
iny
|
|
bne :-
|
|
|
|
;; Stash first two bytes of each bank (128 possible banks)
|
|
: sty BANKSEL
|
|
lda $00
|
|
sta stash_00,y
|
|
lda $01
|
|
sta stash_01,y
|
|
iny
|
|
bpl :-
|
|
dey
|
|
|
|
;; Write bank num/complement at $0/$1
|
|
: sty BANKSEL
|
|
sty $00
|
|
tya
|
|
eor #$FF
|
|
sta $01
|
|
dey
|
|
bne :-
|
|
|
|
;; Y = 0
|
|
|
|
;; Reset signature bytes on main/aux banks
|
|
sty BANKSEL
|
|
sty $00
|
|
sty $01
|
|
sta ALTZPOFF
|
|
sty $00
|
|
sty $01
|
|
sta ALTZPON
|
|
|
|
lda banks_to_reserve
|
|
sta reserved_banks
|
|
|
|
;;; ============================================================
|
|
|
|
;; Copy into every bank
|
|
ldy #1
|
|
bank_loop:
|
|
;; Check bank for signature bytes (bank num/complement at $0/$1)
|
|
sty BANKSEL
|
|
cpy $00
|
|
bne next_bank
|
|
tya
|
|
eor #$FF
|
|
eor $01
|
|
bne next_bank
|
|
cpy $00 ; Bank 0 (aux) is reserved for 128k apps
|
|
bne next_bank
|
|
|
|
;; Flag as available in map2
|
|
;; (map2,N = N if available, $FF otherwise)
|
|
tya
|
|
sta map2,y
|
|
|
|
;; Skip over reserved banks, then start storing them in the map
|
|
ldx reserved_banks
|
|
bne :+
|
|
sta first_used_bank
|
|
: dec reserved_banks
|
|
bpl next_bank
|
|
sta map1,y
|
|
;; (map1,N = N if available, $FF otherwise - also???)
|
|
|
|
;; Copy helper proc into bank's ZP
|
|
ldx #sizeof_zpproc
|
|
: lda zpproc-1,x
|
|
sta zpproc_addr-1,x
|
|
dex
|
|
bne :-
|
|
|
|
next_bank:
|
|
iny
|
|
bpl bank_loop
|
|
|
|
;;; ============================================================
|
|
|
|
;; Y = $80
|
|
|
|
;; Restore stashed $0/$1 bytes of back
|
|
;; (except first, in first_used_bank ???)
|
|
loop0: lda map2-1,y
|
|
bmi :+
|
|
cmp first_used_bank
|
|
beq :+
|
|
sta BANKSEL
|
|
lda stash_00-1,y
|
|
sta $00
|
|
lda stash_01-1,y
|
|
sta $01
|
|
: dey
|
|
bne loop0
|
|
|
|
;; Y = 0
|
|
sty BANKSEL
|
|
sty $00
|
|
|
|
;; Count number of available banks, and populate
|
|
;; driver_bank_list with list of banks.
|
|
ldx #$FF
|
|
loop1: inx
|
|
cpx #kMaxUsableBanks
|
|
bcs break
|
|
loop2: iny
|
|
bmi break
|
|
lda map1,y
|
|
bmi loop2
|
|
sta driver_bank_list,x
|
|
bpl loop1
|
|
break:
|
|
;; Patch driver with block-specific data
|
|
;; X = number of available banks
|
|
|
|
;; Compute number of blocks
|
|
txa
|
|
lsr a
|
|
sta vol_dir_header+VolumeDirectoryHeader::total_blocks+1
|
|
ror vol_dir_header+VolumeDirectoryHeader::total_blocks
|
|
|
|
stx driver_block_x ; num banks
|
|
dex ; -1
|
|
stx num_banks_minus_one
|
|
|
|
bmi fail ; 0 banks? give up.
|
|
|
|
lda vol_dir_header+VolumeDirectoryHeader::total_blocks
|
|
sec
|
|
sbc driver_block_x
|
|
and #$F8
|
|
sta vol_dir_header+VolumeDirectoryHeader::total_blocks
|
|
sta driver_blocks_lo
|
|
bcs :+
|
|
dec vol_dir_header+VolumeDirectoryHeader::total_blocks+1
|
|
: lda vol_dir_header+VolumeDirectoryHeader::total_blocks+1
|
|
sta driver_blocks_hi
|
|
|
|
lda driver_bank_list
|
|
sta BANKSEL
|
|
lda $00
|
|
beq fail
|
|
|
|
;; Check for ZP signature - if not found, set it and install.
|
|
ldx #sig_len-1
|
|
: lda sig,x
|
|
cmp zp_sig_addr,x
|
|
bne set_sig
|
|
dex
|
|
bpl :-
|
|
|
|
bit BUTN1 ; escape hatch in case of loop ???
|
|
bmi L21F0
|
|
jmp do_install
|
|
|
|
fail: jmp install_failure
|
|
|
|
sloop: lda sig,x
|
|
set_sig:
|
|
sta zp_sig_addr,x
|
|
dex
|
|
bpl sloop
|
|
|
|
;;; ============================================================
|
|
|
|
;;; Prepare key blocks in
|
|
|
|
L21F0: sta ALTZPOFF
|
|
|
|
;; Stamp current date/time into vol_dir_header
|
|
ldy #3
|
|
: lda DATELO,y
|
|
sta vol_dir_header+VolumeDirectoryHeader::creation_date,y
|
|
dey
|
|
bpl :-
|
|
|
|
;; Fill pages $06-$0F with 00-FF
|
|
sta RAMWRTON
|
|
iny
|
|
tya
|
|
: sta $0600,y ; Block 2 - volume dir
|
|
sta $0700,y
|
|
sta $0800,y ; Block 3 - volume dir
|
|
sta $0900,y
|
|
sta $0A00,y ; Block 4 - volume dir
|
|
sta $0B00,y
|
|
sta $0C00,y ; Block 5 - volume dir
|
|
sta $0D00,y
|
|
sta $0E00,y ; Block 6 - volume bitmap
|
|
sta $0F00,y
|
|
iny
|
|
bne :-
|
|
|
|
;; Copy vol_dir_header into page $06
|
|
ldy #.sizeof(VolumeDirectoryHeader)-1
|
|
: lda vol_dir_header,y
|
|
sta $0600,y
|
|
dey
|
|
bpl :-
|
|
|
|
ldy #$02
|
|
sty $0800
|
|
iny
|
|
sty $0A00
|
|
iny
|
|
sty $0C00
|
|
sty $0802
|
|
iny
|
|
sty $0A02
|
|
|
|
ptr := $3C
|
|
lda vol_dir_header+VolumeDirectoryHeader::total_blocks
|
|
sta ptr
|
|
lda vol_dir_header+VolumeDirectoryHeader::total_blocks+1
|
|
lsr a
|
|
ror ptr
|
|
lsr a
|
|
ror ptr
|
|
lsr a
|
|
ror ptr
|
|
clc
|
|
adc #$0E
|
|
sta ptr+1
|
|
|
|
ldy #0
|
|
tya
|
|
: sta (ptr),y
|
|
lda ptr
|
|
sec
|
|
sbc #1
|
|
sta ptr
|
|
lda #$FF
|
|
bcs :-
|
|
dec ptr+1
|
|
ldx ptr+1
|
|
cpx #$0E
|
|
bcs :-
|
|
lda #$01
|
|
sta $0E00
|
|
|
|
;;; ============================================================
|
|
|
|
do_install:
|
|
lda #0
|
|
sta RAMWRTOFF
|
|
sta ALTZPOFF
|
|
sta BANKSEL
|
|
bit LCBANK1
|
|
bit LCBANK1
|
|
|
|
lda #OPC_CLD ; signature
|
|
cmp driver_target
|
|
beq copy_driver
|
|
sta ALTZPON ; Maybe in AUX?
|
|
cmp driver_target
|
|
beq copy_driver
|
|
cmp $DE00 ; ???
|
|
beq copy_driver
|
|
sta ALTZPOFF
|
|
|
|
;; Copy driver into place
|
|
copy_driver:
|
|
ldy #0
|
|
: lda driver_src,y
|
|
sta driver_target,y
|
|
iny
|
|
cpy #sizeof_driver
|
|
bcc :-
|
|
|
|
;; Check if unitnum already has a device
|
|
ldy DEVCNT
|
|
: lda DEVLST,y
|
|
lsr a
|
|
lsr a
|
|
lsr a
|
|
lsr a
|
|
cmp unitnum
|
|
beq install_device
|
|
dey
|
|
bpl :-
|
|
|
|
;; Otherwise, insert at end. ProDOS resolves names to devices
|
|
;; from last to first, so fast RAM disks should go last.
|
|
inc DEVCNT
|
|
ldy DEVCNT
|
|
|
|
;; Install device in ProDOS via DEVLST/DEVADR.
|
|
;; (Y has index in DEVLST)
|
|
install_device:
|
|
lda unitnum
|
|
asl a
|
|
tax
|
|
asl a
|
|
asl a
|
|
asl a
|
|
sta on_line_params+1 ; unit_number
|
|
ora #$0E ; $3E - signature byte used by DeskTop
|
|
sta DEVLST,y
|
|
copy16 #(driver_target+1), DEVADR,x
|
|
|
|
;; Did we install into S3D2?
|
|
lda unitnum
|
|
cmp #$0B ; Slot 3 Drive 2
|
|
beq finish
|
|
|
|
;; No, so uninstall S3D2 (regular /RAM)
|
|
ldy DEVCNT
|
|
: lda DEVLST,y
|
|
and #$F0
|
|
cmp #$B0 ; Slot 3 drive 2 i.e. normal /RAM
|
|
beq found
|
|
dey
|
|
bpl :-
|
|
bmi finish ; always
|
|
|
|
;; Actually remove from DEVLST
|
|
slot3d2_devadr := DEVADR + $10 + 3*2
|
|
found: ldx slot3d2_devadr + 1
|
|
inx
|
|
bne finish
|
|
: copy DEVLST+1,y, DEVLST,y
|
|
iny
|
|
cpy DEVCNT
|
|
bcc :-
|
|
beq :-
|
|
dec DEVCNT
|
|
copy16 NODEV, slot3d2_devadr ; clear driver
|
|
|
|
finish: bit ROMIN2
|
|
MLI_CALL ON_LINE, on_line_params
|
|
ldx #$00
|
|
lda on_line_params_buffer
|
|
ora L239F
|
|
bne install_success
|
|
bcc install_success
|
|
copy #$FF, L239F
|
|
sta ALTZPON
|
|
copy driver_bank_list, BANKSEL
|
|
stx $06
|
|
stx BANKSEL
|
|
stx vol_dir_header+VolumeDirectoryHeader::total_blocks
|
|
jmp maybe_install_driver ; retry???
|
|
|
|
install_success:
|
|
sta ALTZPOFF
|
|
|
|
.if ::LOG_SUCCESS
|
|
jsr log_message
|
|
scrcode PRODUCT, " - "
|
|
.byte 0
|
|
.endif ; ::LOG_SUCCESS
|
|
|
|
;; Initialize Applesoft zero page locations required by LINPRNT
|
|
copy #0, SHIFT_SIGN_EXT ; required by FP routines
|
|
copy #TEMPST, TEMPPT ; string descriptor pointer
|
|
copy #1, SPEEDZ ; output delay
|
|
copy #0, FLASH_BIT ; character set mask
|
|
|
|
ldx vol_dir_header+VolumeDirectoryHeader::total_blocks
|
|
lda vol_dir_header+VolumeDirectoryHeader::total_blocks+1
|
|
jsr LINPRNT
|
|
|
|
jsr zstrout
|
|
scrcode " Blocks"
|
|
.byte 0
|
|
|
|
rts
|
|
|
|
install_failure:
|
|
sta ALTZPOFF
|
|
|
|
.if ::LOG_FAILURE
|
|
jsr log_message
|
|
scrcode PRODUCT, " - Not Found"
|
|
.byte 0
|
|
.endif ; ::LOG_FAILURE
|
|
|
|
rts
|
|
|
|
;;; ============================================================
|
|
;;; Installed on zero page of each bank at $B0
|
|
|
|
.proc zpproc
|
|
pushorg ::zpproc_addr
|
|
|
|
sta $E0 ; dst1 hi
|
|
bcs :+
|
|
sty $E0 ; dst1 hi
|
|
tay
|
|
: lda #$00
|
|
sta RAMWRTON
|
|
bcc :+
|
|
txa
|
|
ldx #$00
|
|
sta RAMWRTOFF
|
|
sta RAMRDON
|
|
|
|
;; One block = two pages
|
|
: sty $DD ; src1 hi
|
|
iny
|
|
sty $E3 ; src2 hi
|
|
|
|
sta $DF ; dst1 lo
|
|
sta $E5 ; dst2 lo
|
|
|
|
stx $DC ; src1 lo
|
|
stx $E2 ; src2 lo
|
|
|
|
ldy $E0 ; dst1 hi
|
|
iny
|
|
sty $E6 ; dst2 hi
|
|
|
|
ldy #$00
|
|
: lda $1000,y ; src1
|
|
sta $1000,y ; dst1
|
|
lda $1000,y ; src2
|
|
sta $1000,y ; dst2
|
|
iny
|
|
bne :-
|
|
|
|
sta RAMWRTOFF
|
|
sta RAMRDOFF
|
|
clc
|
|
bit $02E4
|
|
rts
|
|
|
|
poporg
|
|
.endproc
|
|
sizeof_zpproc := .sizeof(zpproc)
|
|
|
|
;;; ============================================================
|
|
|
|
on_line_params_buffer := $220
|
|
DEFINE_ON_LINE_PARAMS on_line_params, $30, on_line_params_buffer
|
|
|
|
num_banks_minus_one:
|
|
.byte 0
|
|
|
|
L239F: .byte 0
|
|
|
|
sig: scrcode "GEB" ; signature sequence - Glen E. Bredon
|
|
sig_len = * - sig
|
|
|
|
;; Volume Directory Header
|
|
.proc vol_dir_header
|
|
.word 0 ; preceding block number
|
|
.word $03 ; succeeding block number
|
|
.byte ST_VOLUME_DIRECTORY << 4 | 3 ; storage type / name length
|
|
.byte "RAM" ; name field is 15 bytes
|
|
.res 15-3
|
|
.res 8, 0 ; reserved (8 bytes)
|
|
.word 0, 0 ; creation date/time
|
|
.byte 1 ; version (1 = ProDOS 2.0)
|
|
.byte 0 ; min_version
|
|
.byte ACCESS_DEFAULT ; access
|
|
.byte $27 ; entry_length
|
|
.byte $D ; entries_per_block
|
|
.word 0 ; file_count
|
|
.word 6 ; bit_map_pointer
|
|
blocks: .word 0 ; total_blocks
|
|
.endproc
|
|
.assert .sizeof(vol_dir_header) = .sizeof(VolumeDirectoryHeader), error, "Size mismatch"
|
|
|
|
.endproc
|
|
|
|
;;; ============================================================
|
|
;;; Ram Disk Driver - installed at $FF00
|
|
;;; ============================================================
|
|
|
|
.proc driver_src
|
|
pushorg ::driver_target
|
|
driver_start := *
|
|
|
|
start: cld ; used as a signature
|
|
|
|
lda DRIVER_COMMAND
|
|
bne not_status
|
|
driver_blocks_lo := *+1
|
|
ldx #0 ; self-modified - blocks low
|
|
driver_blocks_hi := *+1
|
|
ldy #0 ; self-modified - blocks high
|
|
LFF09: clc
|
|
bcc LFF83 ; always
|
|
|
|
not_status:
|
|
cmp #DRIVER_COMMAND_FORMAT
|
|
beq LFF09
|
|
|
|
;; COMMAND_READ or COMMAND_WRITE
|
|
LFF10: lda #$27
|
|
bcs rts1
|
|
|
|
lda RD80STORE
|
|
pha
|
|
sta CLR80COL
|
|
|
|
;; Save $40/41
|
|
lda $40
|
|
pha
|
|
lda $41
|
|
pha
|
|
|
|
lda DRIVER_BUFFER
|
|
sta $40
|
|
ldx DRIVER_BUFFER+1
|
|
inx
|
|
stx $41
|
|
|
|
jsr install_zpproc_relay
|
|
|
|
zpproc_relay_patch1_offset := $04
|
|
stx zpproc_relay_addr + zpproc_relay_patch1_offset
|
|
lda RDALTZP
|
|
|
|
zpproc_relay_patch2_offset := $14
|
|
sta zpproc_relay_addr + zpproc_relay_patch2_offset
|
|
lda DRIVER_BLOCK_NUMBER+1
|
|
pha
|
|
tax
|
|
lda DRIVER_BLOCK_NUMBER
|
|
LFF3C: sec
|
|
: iny
|
|
sbc #$7F
|
|
bcs :-
|
|
dex
|
|
bpl LFF3C
|
|
|
|
tya
|
|
adc DRIVER_BLOCK_NUMBER
|
|
bcc :+
|
|
inc DRIVER_BLOCK_NUMBER+1
|
|
: asl a
|
|
tay
|
|
lda DRIVER_BLOCK_NUMBER+1
|
|
rol a
|
|
tax
|
|
pla
|
|
sta DRIVER_BLOCK_NUMBER+1
|
|
driver_block_x := *+1
|
|
cpx #$0 ; self-modified - ???
|
|
bcs LFF74
|
|
|
|
tya
|
|
sbc #191
|
|
cmp #16
|
|
bcs :+
|
|
adc #208
|
|
|
|
tay
|
|
bit LCBANK2
|
|
: lda DRIVER_COMMAND
|
|
lsr a ; carry set = READ, clear = WRITE
|
|
lda bank_list,x
|
|
ldx DRIVER_BUFFER
|
|
jsr zpproc_relay_addr
|
|
bit LCBANK1
|
|
|
|
LFF74: jsr install_zpproc_relay
|
|
|
|
;; Restore $40/41
|
|
pla
|
|
sta $41
|
|
pla
|
|
sta $40
|
|
|
|
pla
|
|
bpl LFF83
|
|
sta SET80COL
|
|
LFF83: lda #$00
|
|
bcs LFF10
|
|
|
|
rts1: rts
|
|
|
|
install_zpproc_relay:
|
|
ldy #sizeof_zpproc_relay+1
|
|
: ldx zpproc_relay-1,y
|
|
lda zpproc_relay_addr-1,y
|
|
sta zpproc_relay-1,y
|
|
txa
|
|
sta zpproc_relay_addr-1,y
|
|
dey
|
|
bne :-
|
|
|
|
ldx DRIVER_BUFFER+1
|
|
bpl done
|
|
bit DRIVER_BUFFER+1
|
|
bvc done
|
|
|
|
: ldx $8000,y
|
|
lda (DRIVER_BUFFER),y
|
|
sta $8000,y
|
|
txa
|
|
sta (DRIVER_BUFFER),y
|
|
ldx $8100,y
|
|
lda ($40),y
|
|
sta $8100,y
|
|
txa
|
|
sta ($40),y
|
|
iny
|
|
bne :-
|
|
|
|
ldx #$80
|
|
done: rts
|
|
|
|
bank_list:
|
|
.res ::kMaxUsableBanks, 0
|
|
|
|
.proc zpproc_relay
|
|
sta BANKSEL
|
|
|
|
patch_loc1 := *+1
|
|
lda #$00
|
|
sta ALTZPON
|
|
jsr zpproc_addr
|
|
sty BANKSEL
|
|
bmi :+
|
|
sta ALTZPOFF
|
|
: rts
|
|
|
|
patch_loc2 := *
|
|
.endproc
|
|
sizeof_zpproc_relay := .sizeof(zpproc_relay)
|
|
patch_loc1_offset := zpproc_relay::patch_loc1 - zpproc_relay
|
|
patch_loc2_offset := zpproc_relay::patch_loc2 - zpproc_relay
|
|
;; These offsets can't be used directly due to ca65 addressing mode
|
|
;; assumptions, so just verify they are correct.
|
|
.assert zpproc_relay_patch1_offset = patch_loc1_offset, error, "Offset mismatch"
|
|
.assert zpproc_relay_patch2_offset = patch_loc2_offset, error, "Offset mismatch"
|
|
|
|
.byte 0
|
|
|
|
poporg
|
|
.endproc
|
|
sizeof_driver := .sizeof(driver_src)
|
|
|
|
driver_blocks_lo := driver_src + driver_src::driver_blocks_lo - driver_src::driver_start
|
|
driver_blocks_hi := driver_src + driver_src::driver_blocks_hi - driver_src::driver_start
|
|
driver_block_x := driver_src + driver_src::driver_block_x - driver_src::driver_start
|
|
driver_bank_list := driver_src + driver_src::bank_list - driver_src::driver_start
|
|
|
|
;;; ============================================================
|
|
;;; Scratch space beyond code used during driver install
|
|
|
|
reserved_banks := *
|
|
first_used_bank := *+1
|
|
map1 := *+2 ; len: $80
|
|
map2 := *+2+$80 ; len: $80
|
|
stash_00 := *+2+$100 ; len: $80
|
|
stash_01 := *+2+$180 ; len: $80
|
|
|
|
;;; ************************************************************
|
|
.include "../inc/driver_postamble.inc"
|
|
;;; ************************************************************
|