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https://github.com/badvision/lawless-legends.git
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Now can actually make use of the RAM freed by moving ProDOS.
This commit is contained in:
Martin Haye
parent
53b956eccc
commit
a8e501c51b
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@ -468,8 +468,10 @@ init: !zone
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; 3: aux $C000 -> 0, active + locked
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; 4: main $0xxx -> 5, inactive (xxx = end of mem mgr tables)
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; 5: main $2000 -> 6, active + locked
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; 6: main $6000 -> 3, inactive
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; 7: main $BF00 -> 0, active + locked
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; 6: main $6000 -> 7, inactive
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; 7: main $BF00 -> 8, active + locked
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; 8: main $E000 -> 9, inactive
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; 9: main $F800 -> 0, active + locked
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; First, the flags
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lda #$C0 ; flags for active + locked (with no resource)
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sta tSegType+0
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@ -477,6 +479,7 @@ init: !zone
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sta tSegType+3
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sta tSegType+5
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sta tSegType+7
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sta tSegType+9
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; Next the links
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ldx #2
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stx tSegLink+1
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@ -490,6 +493,10 @@ init: !zone
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stx tSegLink+5
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inx
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stx tSegLink+6
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inx
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stx tSegLink+7
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inx
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stx tSegLink+8
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; Then the addresses
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lda #2
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sta tSegAdrHi+2
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@ -505,10 +512,14 @@ init: !zone
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sta tSegAdrHi+5
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lda #$60
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sta tSegAdrHi+6
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lda #$E0
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sta tSegAdrHi+8
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lda #$F8
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sta tSegAdrHi+9
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; Finally, form a long list of the remaining unused segments.
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ldx #8
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ldx #10
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stx unusedSeg ; that's the first unused seg
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ldy #9
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ldy #11
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.loop: tya
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sta tSegLink,x
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inx
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@ -573,8 +584,8 @@ moveProDOS: !zone
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; copy the ProDOS code from main memory to aux
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ldy #0
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ldx #$D0
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bit $C08B ; turn on language card
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bit $C08B ; for writing
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bit setLcRW+lcBank1 ; turn on language card
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bit setLcRW+lcBank1 ; 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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@ -586,7 +597,6 @@ moveProDOS: !zone
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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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@ -609,8 +619,8 @@ moveProDOS: !zone
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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 $C089
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bit setLcWr+lcBank1 ; only clear bank 1, because bank 2 is PLASMA runtime
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bit setLcWr+lcBank1 ; write to it
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ldx #$D0
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lda #0
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tay
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@ -671,25 +681,23 @@ enterProDOS2: !zone
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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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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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pla ; P-reg for RTI
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sta .ld2+1
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pla ; hi byte of ret addr
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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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pla ; lo byte of ret addr
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sta clrAuxZP ; back to main stack/ZP/LC
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bit setLcRW+lcBank2 ; switch in PLASMA
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bit setLcRW+lcBank2 ; for write as well as read
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pha ; lo byte of ret addr
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.ld1 lda #11 ; self-modified earlier
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pha ; hi byte of ret addr
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.ld2 lda #11 ; ditto
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pha ; P-reg for RTI
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.ld3 lda #11 ; self-modified earlier (the saved A reg)
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rti ; RTI pops P-reg and *exact* return addr (not adding 1)
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;------------------------------------------------------------------------------
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!if DEBUG {
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@ -2074,7 +2082,6 @@ doAllFixups: !zone
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; 8. Store A=lo/Y=hi into PLASMA return value
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; 9. Return to PLASMA
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__asmPlasm: !zone
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bit setROM ; switch to ROM
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pla ; save address of calling routine, so we can call it
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clc
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adc #1
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@ -2095,7 +2102,6 @@ __asmPlasm: !zone
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lda evalStkL,x ; get last param to A=lo
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ldy evalStkH,x ; ...Y=hi
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.jsr jsr $1111 ; call the routine to do work
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bit setLcRW+lcBank2 ; read from language card (where PLASMA runtime lives)
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sta tmp ; stash return value lo
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pla
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tax ; restore adjusted PLASMA stack pointer
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@ -479,7 +479,6 @@ end
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// Jump straight to the system monitor
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// Params: None
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asm goMon
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bit setROM
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jmp $FF69
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end
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@ -487,7 +486,6 @@ end
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// Execute a monitor breakpoint
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// Params: None
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asm brk
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bit setROM
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bit setText
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bit page1
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brk
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@ -1617,9 +1617,7 @@ loadTextures: !zone
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; finally, init the scripts.
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!if DEBUG { +prStr : !text "Calling script init ",0 : +prWord .scInit+1 : +crout }
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ldx plasmaStk
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bit setLcRW+lcBank2 ; switch PLASMA runtime back in
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.scInit jsr $1111 ; self-modified earlier
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bit setROM ; back to ROM so we can work normally
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!if DEBUG { +prStr : !text "Back from script init. ",0 }
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rts
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.get: lda $1111
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@ -321,9 +321,7 @@ LOAD_SCRIPTS_NO_CALC:
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+finishLoad 0 ; all done
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!if DEBUG { +prStr : !text "Calling init script.",0 }
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LDX PLASMA_X
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BIT setLcRW+lcBank2 ; switch PLASMA runtime back in
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JSR .callit ; perform script init
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BIT setROM ; switch out PLASMA so we're ready to render
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!if DEBUG { +prStr : !text "Back from init script.",0 }
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RTS
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.callit JMP (SCRIPTS_LOC) ; the init function is always first in the script module
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