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Updated cx16 to match the Commander X16 ROMs and emulator, release 34.

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This commit is contained in:
Greg King
2019-11-16 13:11:40 -05:00
parent 4dda5d2173
commit d78133e1f0
37 changed files with 607 additions and 182 deletions
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21
libsrc/cx16/break.s
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@@ -1,6 +1,6 @@
;
; 1998-09-27, Ullrich von Bassewitz
; 2019-09-08, Greg King
; 2019-11-06, Greg King
;
; void __fastcall__ set_brk (unsigned Addr);
; void reset_brk (void);
@@ -30,6 +30,7 @@ uservec: jmp $FFFF ; Patched at runtime
.code
; Set the break vector
.proc _set_brk
sta uservec+1
@@ -40,9 +41,9 @@ uservec: jmp $FFFF ; Patched at runtime
bne L1 ; Jump if we installed the handler already
lda BRKVec
ldx BRKVec+1
sta oldvec
lda BRKVec+1
sta oldvec+1 ; Save the old vector
stx oldvec+1 ; Save the old vector
L1: lda #<brk_handler ; Set the break vector to our routine
ldx #>brk_handler
@@ -54,6 +55,7 @@ L1: lda #<brk_handler ; Set the break vector to our routine
; Reset the break vector
.proc _reset_brk
lda oldvec
@@ -61,15 +63,15 @@ L1: lda #<brk_handler ; Set the break vector to our routine
beq @L9 ; Jump if vector not installed
sta BRKVec
stx BRKVec+1
lda #$00
sta oldvec ; Clear the old vector
stx oldvec+1
sta oldvec+1
@L9: rts
.endproc
; Break handler, called if a break occurs
.proc brk_handler
@@ -81,14 +83,13 @@ L1: lda #<brk_handler ; Set the break vector to our routine
pla
sta _brk_a
pla
and #$EF ; Clear break bit
sta _brk_sr
pla ; PC low
sec
sbc #2 ; Point to start of brk
sbc #<$0002 ; Point to start of BRK
sta _brk_pc
pla ; PC high
sbc #0
sbc #>$0002
sta _brk_pc+1
jsr uservec ; Call the user's routine
@@ -99,11 +100,9 @@ L1: lda #<brk_handler ; Set the break vector to our routine
pha
lda _brk_sr
pha
ldx _brk_x
ldy _brk_y
ldx _brk_x
lda _brk_a
rti ; Jump back...
.endproc