Closed cdacunha71 closed 1 year ago
GeorgRottensteiner
commented
2 years ago Can you show an example where it doesn't work?
I'm using it for other architectures (e.g Mega65, where it starts with $2001) and it works fine. Also just tested with a different address, the line pointers and the SYS address are correct.
cdacunha71
commented
2 years ago Hi Georg,
I'm using to refresh my C64 assembler skills, so nothing fancy in combination with WinVice GTK3VICE-3.6.0-win64
Here the sample that doesn't work
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lda #$FF sta $d40e sta $d40f lda #$80 sta $d412
loop lda $d41b ror a lda #205 adc #0 jsr $ffd2 jmp loop
Disassembly from prg file yields
Notice the $08 missing after $0B, the SYS line is correct
Same program other address, this one works when you do build and run
lda #$FF sta $d40e sta $d40f lda #$80 sta $d412
loop lda $d41b ror a lda #205 adc #0 jsr $ffd2 jmp loop
Disassembly from prg file yields
Maybe I forgot to mention the architecture somewhere ?
Wait, I'm not using a new solution, I'm just using new file - ASM file
Regards
Carlos
On Wed, Jan 26, 2022 at 4:52 PM Georg Rottensteiner < @.***> wrote:
Can you show an example where it doesn't work?
I'm using it for other architectures (e.g Mega65, where it starts with $2001) and it works fine. Also just tested with a different address, the line pointers and the SYS address are correct.
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GeorgRottensteiner
commented
2 years ago Ahh, you're using the in built disassembler? This one only assumes a BASIC start with $0801. That's where I should fix things.
The actual data is correct:
0B C0 0A 00 9E 34 39 31 36 35 00 00 00
$C000: 0B C0 = Pointer to next BASIC line
$C002: 0A 00 = line number 10
$C004: 9E = SYS
$C005: 34 39 31 36 35 = 49165 ($C00D)
$C00A: 00 = end of line
$C00B: 00 00 = pointer to next BASIC line (00 00 marks the end of the listing)I'm not sure C64 will work with a BASIC listing at $c000. Never tried that actually. I guess that could work if you change all pointers for the heap, etc.
cdacunha71
commented
2 years ago Hi Georg,
I don't think it will, the basic listing needs to sit a $0801. No worries I'll continue using it as the start address for the things I'm doing. Thanks for sharing this great tool.
Regards
On Wed, Jan 26, 2022 at 6:09 PM Georg Rottensteiner < @.***> wrote:
Ahh, you're using the in built disassembler? This one only assumes a BASIC start with $0801. That's where I should fix things.
The actual data is correct:
0B C0 0A 00 9E 34 39 31 36 35 00 00 00
$C000: 0B C0 = Pointer to next BASIC line $C002: 0A 00 = line number 10 $C004: 9E = SYS $C005: 34 39 31 36 35 = 49165 ($C00D) $C00A: 00 = end of line $C00B: 00 00 = pointer to next BASIC line (00 00 marks the end of the listing)
I'm not sure C64 will work with a BASIC listing at $c000. Never tried that actually. I guess that could work if you change all pointers for the heap, etc.
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According to documentation it should be able to cope with other start addresses
This pseudo op adds a BASIC start line with a sys call to either the given jump address or the first statement after the pseudo op. If not provided otherwise the added BASIC line always has line number 10 and a 4 digit target address. This way the BASIC line will always require 12 bytes. If the jump address is 5 decimal digits the line will use 13 bytes.