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Don't hardcode the address of the SYS call for the startup code of the

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Commodore machines.


git-svn-id: svn://svn.cc65.org/cc65/trunk@4474 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz
2009-11-23 12:01:24 +00:00
parent 61b2834508
commit c7a33334ba
6 changed files with 47 additions and 28 deletions
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32
libsrc/c128/crt0.s
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@@ -28,52 +28,56 @@ IRQInd = $2FD ; JMP $0000 - used as indirect IRQ vector
; BASIC header with a SYS call
.org $1BFF
.org $1BFF
.word Head ; Load address
Head: .word @Next
.word .version ; Line number
.byte $9E,"7181" ; SYS 7181
.byte $9E ; SYS token
.byte <(((Start / 1000) .mod 10) + $30)
.byte <(((Start / 100) .mod 10) + $30)
.byte <(((Start / 10) .mod 10) + $30)
.byte <(((Start / 1) .mod 10) + $30)
.byte $00 ; End of BASIC line
@Next: .word 0 ; BASIC end marker
.reloc
.reloc
; ------------------------------------------------------------------------
; Actual code
; Close open files
jsr CLRCH
Start: jsr CLRCH
; Switch to the second charset
lda #14
jsr BSOUT
lda #14
jsr BSOUT
; Before doing anything else, we have to setup our banking configuration.
; Otherwise just the lowest 16K are actually RAM. Writing through the ROM
; to the underlying RAM works, but it is bad style.
lda MMU_CR ; Get current memory configuration...
lda MMU_CR ; Get current memory configuration...
pha ; ...and save it for later
lda #MMU_CFG_CC65 ; Bank0 with kernal ROM
sta MMU_CR
sta MMU_CR
; Save the zero page locations we need
ldx #zpspace-1
L1: lda sp,x
sta zpsave,x
dex
L1: lda sp,x
sta zpsave,x
dex
bpl L1
; Clear the BSS data
jsr zerobss
jsr zerobss
; Save system stuff and setup the stack
pla ; Get MMU setting
sta mmusave
pla ; Get MMU setting
sta mmusave
tsx
stx spsave ; Save the system stack pointer