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rom4x
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reorganize dispatching to work like 5X

This commit is contained in:
mgcaret 2018-09-29 23:56:04 -07:00
parent ee1faf6cc7
commit 264bf5ce0d
11 changed files with 142 additions and 81 deletions
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8
rom4x/B0_C552_patch_bootfail.s
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@ -10,9 +10,5 @@
.byte 0 ; rom4x present
cbtfail: jsr setvid
jsr setkbd
lda #>(nbtfail-1)
pha
lda #<(nbtfail-1)
pha
jmp swrts2
lda #$01 ; cmd = boot fail1
jmp $c7fc ; to dispatcher

12
rom4x/B0_C763_switcher.s
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@ -1,12 +0,0 @@
.code
.include "iic.defs"
.org gorst4x
sta rombank ; gorst4x
jmp rst4xrtn ; in other bank jmp reset4x
sta rombank ; gobt4x
jmp bt4xrtn ; in other bank jmp boot4x
sta rombank ; gobanner
jsr banner ; in other bank jmp $c784 for now
sta rombank ; return to other bank
rts ; should never get here

10
rom4x/B0_C7FC_4x_switch.s Normal file
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@ -0,0 +1,10 @@
; There's a bit of luck in the firmware
; there are 4 $00 bytes at $C7FC in the main bank, of which the last
; is "AppleTalk version" according to the ROM $03 source code
; in the tech ref, and should be left at $00.
; There are also 7 $00 bytes at $C7FC in the aux bank. So if we switch at
; $C7FC, then we get a 4 bytes in the aux bank, just enough for a jump.
.code
.org $c7fc
sta $c028

15
rom4x/B0_CFF9_switch_cmd.s Normal file
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@ -0,0 +1,15 @@
; This is the dispatch routine to call the primary ROM 4X
; functions of intercepting RESET and the boot process.
; If one enters at $CFF9, the command $A9 is loaded and
; we go to the BELL1 hijack. If entering at $CFFA, we
; load the command $EA and proceed the same way.
; thus we get two dispatch codes in 6 bytes.
.include "iic.defs"
.code
.org $cff9 ; 7 bytes available here, but don't count on $CFFF
lda #$a9 ; lda opcode
nop ; jmp/jsr $cffa does lda #$ea
jmp $c7fc ; jump to 4X dispatcher
; total 6 bytes.

3
rom4x/B0_FAB4_patch_pwrup.s
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@ -1,6 +1,7 @@
; patch PWRUP to call boot4x
.code
.include "iic.defs"
.code
.org $fab4
nop
jmp gobt4x

3
rom4x/B0_FAC8_patch_reset.s
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@ -1,6 +1,7 @@
; patch RESET.X to call reset4x
.code
.include "iic.defs"
.code
.org $fac8
jmp gorst4x

13
rom4x/B1_C763_switcher.s
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@ -1,13 +0,0 @@
.code
.include "iic.defs"
.org gorst4x
sta rombank ; gorst4x
jmp reset4x ; in other bank jmp rstxrtn
sta rombank ; gobt4x
jmp boot4x
sta rombank ; gobanner
jmp $c784 ; in other bank jsr appleii
sta rombank
rts ; not in other bank

6
rom4x/B1_C7FF_4x_jump.s Normal file
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@ -0,0 +1,6 @@
; See B0 C7FC patch for description
.include "iic.defs"
.code
.org $c7ff
jmp rom4x_disp

124
rom4x/B1_E000_rom4x.s
View File

@ -1,16 +1,47 @@
.psc02
.code
.include "iic.defs"
.org reset4x
.org rom4x_disp
.proc dispatch
cmp #$a9 ; reset patch
bne :+
bra reset4x
: cmp #$ea ; boot patch
bne :+
jmp boot4x
: dec a ; $01 = new boot fail routine
bne :+
jmp nbtfail
; TODO: Dispatch XModem stuff here
: lda #>(monitor-1)
pha
lda #<(monitor-1)
pha
jmp swrts2 ; jump to monitor
.endproc
; next is snippet of code to boot external 5.25
.proc bootext
lda #$e0
ldy #$01 ; unit #
ldx #$60 ; slot #
jmp $c60b ; jump into Disk II code
.endproc
.proc reset4x
stz power2 + rx_mslot ; action = normal boot
asl butn1 ; closed apple
bcs ckdiag
exitrst: jmp gorst4x ; return to RESET.X
exitrst: lda #>(rst4xrtn-1)
pha
lda #<(rst4xrtn-1)
pha
jmp swrts2
; check to see if both apples are down
ckdiag: bit butn0 ; open apple
bmi exitrst ; return to RESET.X
; present menu because only closed apple is down
menu4x: jsr gobanner ; "Apple //c"
menu4x: jsr ntitle ; "Apple //c"
ldx #$00 ; menu start
jsr disp ; show it
jsr gtkey
@ -38,6 +69,9 @@ ckkey2: sec
stz softev + 1 ; deinit coldstart
stz pwerdup ; ditto
bra exitrst
.endproc
.proc gtkey
gtkey: lda #$60
sta ($0),y ; cursor
sta kbdstrb ; clr keyboard
@ -45,8 +79,11 @@ kbdin: lda kbd ; get key
bpl kbdin
sta kbdstrb ; clear keyboard
sta ($0),y ; put it on screen
rts
rts
.endproc
; display message, input x = message start relative to msg1
.proc disp
disp: stz $0 ; load some safe defaults
lda #$04
sta $1
@ -66,7 +103,10 @@ disp2: sta $1 ; write address high
sta $0 ; write address low
inx ; set next msg byte
bra disp0 ; back to the beginning
confirm: pha
.endproc
.proc confirm
pha
ldx #(msg3-msg1) ; ask confirm
jsr disp
jsr gtkey
@ -77,6 +117,8 @@ confirm: pha
txa
plp
rts
.endproc
; msg format
; A byte < $20 indicates high byte of address.
; Next byte must be low byte of address. Anything
@ -97,10 +139,8 @@ msg2: .byte $07,$db,"ROM 4X 05/27/17"
msg3: .byte $05,$b0,"SURE? ",$00
; Boot4X - the boot portion of the program
.assert * < boot4x, warning, .sprintf("Boot4X overrun! * = %x, > %x", *, boot4x)
.res boot4x - *, 0
.org boot4x
jsr gobanner ; "Apple //c"
.proc boot4x
jsr ntitle ; "Apple //c"
jsr rdrecov ; try to recover ramdisk
lda power2 + rx_mslot ; get action saved by reset4x
beq :+ ; unset, go look for config on ram card
@ -115,7 +155,7 @@ msg3: .byte $05,$b0,"SURE? ",$00
phx ; config present, save it and move on
lda #'C' ; tell user
sta $7d1 ; on screen
selboot: ldx #(msg2-msg1) ; short banner offset
selboot: ldx #(msg2-msg1) ; short offset
jsr disp ; display it
pla ; get boot selection from stack
;sta $7d2
@ -150,7 +190,7 @@ btc7: cmp #$07 ; boot ext drive
bne boot4 ; none of the above
; copy small routine to $800 to boot
; external 5.25
ldy #(bt4xend-bootext+1)
ldy #.sizeof(bootext)
btc7lp: lda bootext,y
sta $800,y
dey
@ -165,8 +205,15 @@ boot6: lda #$c6 ; boot slot 6
bootsl: ldx #$00 ; low byte of slot
bootadr: stx $0 ; store address
sta $1 ; return to bank 0 does jmp (0)
endbt4x: jmp gobt4x ; continue boot
rdrecov: jsr rdinit ; init ramcard
endbt4x: lda #>(bt4xrtn-1)
pha
lda #<(bt4xrtn-1)
pha
jmp swrts2
.endproc
.proc rdrecov
jsr rdinit ; init ramcard
lda pwrup,y ; get power up flag
cmp #pwrbyte ; already initialized?
beq recovdn ; exit if initialized
@ -188,8 +235,11 @@ rdrecov: jsr rdinit ; init ramcard
lda #'R' ; tell user
sta $7d0 ; on screen
recovdn: rts
.endproc
; zero ram card space
rdclear: jsr rdinit ; init ramcard
.proc rdclear
jsr rdinit ; init ramcard
jsr testsize ; get size
lda numbanks,y ; # of 64Ks to write
beq clrdone ; no memory
@ -217,16 +267,28 @@ clrdone: ldx #rx_mslot
lda #$a0 ; ' '
sta $400 ; clear progress
rts
rdinit: bit rx_mslot*$100 ; activate registers
.endproc
.proc rdinit
bit rx_mslot*$100 ; activate registers
ldy #rx_mslot ; slot offset
ldx #rx_devno ; register offset
rts
; next is snippet of code to boot external 5.25
bootext: lda #$e0
ldy #$01 ; unit #
ldx #$60 ; slot #
jmp $c60b ; jump into Disk II code
bt4xend = *
.endproc
; arrange a sequence of RTS tricks to display title screen
.proc ntitle
lda #>(swrts2-1) ; put return addr of swrts/swrts2 on stack
pha
lda #<(swrts2-1)
pha
lda #>(banner-1) ; put addr of the Title routine on the stack
pha
lda #<(banner-1)
pha
jmp swrts2 ; jump to swrts2
.endproc
; --------------------------------------------------
; config getter
; values and locs
@ -346,4 +408,22 @@ fname_ = *
rts
.endproc
; Display new boot failure message and jump to BASIC
.proc nbtfail
ldx #msglen
lp1: lda bootmsg,x
ora #$80
sta $7d0+19-(<msglen/2),x
dex
bpl lp1
lda #23 ; last line
sta cv
lda #>(basic-1)
pha
lda #<(basic-1)
pha
jmp swrts2
bootmsg:
.byte "No bootable device."
msglen = * - bootmsg - 1
.endproc

19
rom4x/B1_E400_new_bootfail.s
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@ -1,19 +0,0 @@
.code
.include "iic.defs"
.org nbtfail
ldx #msglen
lp1: lda bootmsg,x
ora #$80
sta $7d0+19-(<msglen/2),x
dex
bpl lp1
lda #23 ; last line
sta cv
lda #>(basic-1)
pha
lda #<(basic-1)
pha
jmp swrts2
bootmsg: .byte "No bootable device."
msglen = * - bootmsg - 1

10
rom4x/iic.defs
View File

@ -39,15 +39,11 @@ rx_mslot = rx_slot + $c0
rx_devno = rx_slot * $10 + $88
; entry points
gorst4x = $c763 ; switch to/from reset4x
gobt4x = gorst4x + 6 ; switch to/from boot4x
gobanner = gobt4x + 6 ; banner from bank 1
gorst4x = $cff9 ; reset patch destination
gobt4x = $cffa ; boot patch destination
rst4xrtn = $facb ; where to return from reset4x
;bt4xrtn = $fb12 ; where to return from boot4x
bt4xrtn = $fb19 ; where to return from boot4x
reset4x = $e000 ; reset routine
boot4x = $e180 ; boot routine
nbtfail = $e400 ; new boot fail
rom4x_disp = $e000 ; main dispatch code
banner = $fb60 ; 'Apple //c'
testsize = $d99f ; test ramdisk size (rom 3 = $d995)
monitor = $ff59 ; monitor