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Updated the cx16 start-up to the emulator's release 32.

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Made the Kernal ROM be visible when programs start.
This commit is contained in:
Greg King 2019-09-28 00:54:27 -04:00
parent 18afc7c703
commit 6cae84a25d
1 changed files with 13 additions and 5 deletions
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18
libsrc/cx16/crt0.s
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@ -7,7 +7,7 @@
.import initlib, donelib .import initlib, donelib
.import zerobss, callmain .import zerobss, callmain
.import BSOUT .import CHROUT
.import __MAIN_START__, __MAIN_SIZE__ ; Linker-generated .import __MAIN_START__, __MAIN_SIZE__ ; Linker-generated
.importzp ST .importzp ST
@ -58,8 +58,11 @@ L2: lda zpsave,x
ldx spsave ldx spsave
txs ; Restore stack pointer txs ; Restore stack pointer
ldx banksave ldx ramsave
stx VIA1::PRA2 ; Restore former RAM bank stx VIA1::PRA2 ; Restore former RAM bank
lda VIA1::PRB
and #<~$07
sta VIA1::PRB ; Change back to BASIC ROM
; Back to BASIC. ; Back to BASIC.
@ -71,11 +74,16 @@ L2: lda zpsave,x
.segment "ONCE" .segment "ONCE"
init: init:
; Change from BASIC's ROM to Kernal's ROM.
lda VIA1::PRB
ora #$07
sta VIA1::PRB
; Change to the first RAM bank. ; Change to the first RAM bank.
lda VIA1::PRA2 lda VIA1::PRA2
sta banksave ; Save the current bank number sta ramsave ; Save the current RAM bank number
lda #$00 ; Choose RAM bank zero lda #$00 ; Choose RAM bank zero
sta VIA1::PRA2 sta VIA1::PRA2
@ -97,7 +105,7 @@ L1: lda sp,x
; Switch to the second charset. ; Switch to the second charset.
lda #$0E lda #$0E
jsr BSOUT jsr CHROUT
; Call the module constructors. ; Call the module constructors.
@ -109,7 +117,7 @@ L1: lda sp,x
.segment "INIT" .segment "INIT"
banksave: ramsave:
.res 1 .res 1
spsave: .res 1 spsave: .res 1
zpsave: .res zpspace zpsave: .res zpspace