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Upgraded the cx16 library to the Commander X16 Kernal ROM's prerelease 39.

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This commit is contained in:
Greg King
2022-04-02 09:39:35 -04:00
parent 75ee10478e
commit a5e69e7ea6
18 changed files with 208 additions and 172 deletions
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43
libsrc/cx16/crt0.s
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@@ -1,5 +1,5 @@
;
; Start-up code for cc65 (CX16 r35 version)
; Start-up code for cc65 (CX16 r39 version)
;
.export _exit
@@ -20,7 +20,7 @@
.segment "STARTUP"
Start: tsx
stx spsave ; Save the system stack ptr
stx spsave ; Save the system stack ptr.
; Save space by putting some of the start-up code in the ONCE segment
; which will be re-used by the BSS segment, the heap, and the C stack.
@@ -46,26 +46,14 @@ _exit:
jsr donelib
.if 0 ; (We don't need to preserve zero-page space for cc65's variables.)
; Copy back the zero-page stuff.
ldx #zpspace-1
L2: lda zpsave,x
sta sp,x
dex
bpl L2
.endif
; Restore the system stuff.
ldx spsave
txs ; Restore stack pointer
ldx ramsave
stx VIA1::PRA ; Restore former RAM bank
lda VIA1::PRB
and #<~$07
ora #$04
sta VIA1::PRB ; Change back to BASIC ROM
stx RAM_BANK ; Restore former RAM bank
lda #$04
sta ROM_BANK ; Change back to BASIC ROM
; Back to BASIC.
@@ -79,26 +67,14 @@ L2: lda zpsave,x
init:
; Change from BASIC's ROM to Kernal's ROM.
lda VIA1::PRB
and #<~$07
sta VIA1::PRB
stz ROM_BANK
; Change to the second RAM bank.
lda VIA1::PRA
lda RAM_BANK
sta ramsave ; Save the current RAM bank number
lda #$01
sta VIA1::PRA
.if 0 ; (We don't need to preserve zero-page space for cc65's variables.)
; Save the zero-page locations that we need.
ldx #zpspace-1
L1: lda sp,x
sta zpsave,x
dex
bpl L1
.endif
sta RAM_BANK
; Set up the stack.
@@ -125,6 +101,3 @@ L1: lda sp,x
ramsave:
.res 1
spsave: .res 1
.if 0
zpsave: .res zpspace
.endif