mirror of
https://github.com/badvision/lawless-legends.git
synced 2024-12-26 19:29:27 +00:00
Relocated ProDOS to aux bank.
This commit is contained in:
Martin Haye
parent
de5fce5414
commit
53b956eccc
@ -314,10 +314,12 @@ saneCheck: !zone {
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lda $BF00
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cmp #$4C
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beq +
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+prChr 'S'
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brk
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+ lda $E1
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cmp #$BE
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bcc +
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+prChr 's'
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brk
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+ rts
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}
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@ -420,6 +422,8 @@ init: !zone
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inx
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bne -
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+
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; relocate ProDOS to the aux LC bank
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jsr moveProDOS
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; close all files
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lda #0
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jsr closeFile
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@ -429,6 +433,7 @@ init: !zone
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.clr: sta prodosMemMap-1,x
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dex
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bne .clr
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; clear the segment tables
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- sta tSegLink,x
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sta tSegAdrLo,x
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@ -529,6 +534,15 @@ init: !zone
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dey
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lda #LOCK_MEMORY ; lock it in place forever
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jsr mainLoader
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; Reserve hi-res page 1
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lda #SET_MEM_TARGET
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ldx #0
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ldy #$20 ; at $2000
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jsr mainLoader
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lda #REQUEST_MEMORY
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ldx #0
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ldy #$20 ; length $2000
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jsr mainLoader
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; Load PLASMA module #1
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ldx #0
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lda #START_LOAD
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@ -548,6 +562,135 @@ init: !zone
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.gomod: jmp $1111 ; jump to module for further bootstrapping
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.welcomeStr !text "Welcome to MythOS.",$8D,0
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;------------------------------------------------------------------------------
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moveProDOS: !zone
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; only do this once
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lda $BFBB
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cmp #$4C
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bne +
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rts
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+
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; copy the ProDOS code from main memory to aux
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ldy #0
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ldx #$D0
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bit $C08B ; turn on language card
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bit $C08B ; for writing
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.pglup stx .ld+2
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stx .st+2
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.bylup sta clrAuxZP
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.ld lda $D000,Y
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sta setAuxZP
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.st sta $D000,Y
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iny
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bne .bylup
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inx
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bne .pglup
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sta clrAuxZP
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bit $C081
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; patch into the main ProDOS MLI entry point
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lda #$4C ; jmp
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sta $BFBB
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lda #<enterProDOS1
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sta $BFBC
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lda #>enterProDOS1
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sta $BFBD
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; patch into the interrupt handler
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lda #$4C ; jmp
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sta $BFEB
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lda #<enterProDOS2
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sta $BFEC
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lda #>enterProDOS2
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sta $BFED
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; patch into the shared MLI/IRQ exit routine
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lda #$4C ; jmp
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sta $BFA0
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lda #<exitProDOS
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sta $BFA1
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lda #>exitProDOS
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sta $BFA2
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; now blow away the main LC area as a check
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bit $C089
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bit $C089
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ldx #$D0
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lda #0
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tay
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.clrlup stx .st2+2
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.st2 sta $D000,Y
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iny
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bne .st2
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inx
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cpx #$F8
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bne .clrlup
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; it's very convenient to have the monitor in the LC
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.cpmon stx .ld3+2
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stx .st3+2
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.ld3 lda $F800,Y
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.st3 sta $F800,Y
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iny
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bne .ld3
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inx
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bne .cpmon
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; all done
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.done rts
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;------------------------------------------------------------------------------
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; Normal entry point for ProDOS MLI calls. This patches the code at $BFBB.
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enterProDOS1: !zone
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pla ; saved A reg
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sta .ld2+1
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pla ; lo byte of ret addr
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sta .ld1+1
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pla ; hi byte of ret addr
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sta setAuxZP ; switch to aux stack/ZP/LC
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pha ; hi byte of ret addr
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.ld1 lda #11 ; self-modified earlier
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pha ; lo byte of ret addr
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.ld2 lda #11 ; saved A reg
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pha
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lda $E000 ; this is what the original code at $BFBB did
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jmp $BFBE ; jump back in where ProDOS enter left off
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;------------------------------------------------------------------------------
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; Entry point for ProDOS interrupt handler. This patches the code at $BFEB.
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enterProDOS2: !zone
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pla ; saved P reg
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sta .ld2+1
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pla ; ret addr lo
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sta .ld1+1
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pla ; ret addr hi
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sta setAuxZP ; switch to aux stack/ZP/LC
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pha
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.ld1 lda #11 ; self-modified earlier
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pha
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.ld2 lda #11 ; ditto
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pha
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bit $C08B ; this is what the original code at $BFEB did
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jmp $BFEE ; back to where ProDOS left off
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;------------------------------------------------------------------------------
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; Shared exit point for ProDOS MLI and IRQ handlers. This patches the code
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; at $BFA0.
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exitProDOS: !zone
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sta .ld4+1 ; preserve A reg
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pla ; saved A reg
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sta .ld3+1
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pla ; lo byte of ret addr
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sta .ld2+1
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pla ; hi byte of ret addr
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sta .ld1+1
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pla ; saved P reg
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sta clrAuxZP ; back to main stack/ZP/LC
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pha
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.ld1 lda #11 ; self-modified earlier
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pha
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.ld2 lda #11 ; ditto
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pha
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.ld3 lda #11 ; ditto
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pha
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.ld4 lda #11 ; ditto
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eor $E000 ; this is what the original code at $BFA0 did
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jmp $BFA3 ; back to where ProDOS left off
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;------------------------------------------------------------------------------
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!if DEBUG {
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printMem: !zone
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@ -631,7 +774,7 @@ reservedErr: !zone
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ldx #<+
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ldy #>+
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jmp fatalError
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+ !text "Mem reserved", 0
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+ !text "Mem already alloc'd", 0
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;------------------------------------------------------------------------------
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main_request: !zone
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@ -1252,6 +1252,8 @@ def loadTitle()
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puts("Loading Lawless Legends.\n")
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// Load the title screen
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loader(UNLOCK_MEMORY, MAIN_MEM, $2000)
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loader(FREE_MEMORY, MAIN_MEM, $2000)
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loader(SET_MEM_TARGET, MAIN_MEM, $2000)
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loader(QUEUE_LOAD, MAIN_MEM, 1<<8 | RES_TYPE_SCREEN) // title screen is fixed at #1
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loader(LOCK_MEMORY, MAIN_MEM, $2000)
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