breakintoprogram / agon-projects

Official AGON QUARK Firmware: Projects

Hi, I’m @breakintoprogram

I'm an ex-games developer who worked at various companies in the UK in the 80s and 90s

I now repair, code, and blog about retro computers as a hobby

You can find me on social media:

• Blog: breakintoprogram.co.uk
• Twitter: @breakintoprog
• YouTube: youtube.com/BreakIntoProgram
• Mastadon: oldbytes.space/@breakintoprogram
• Blue Sky: @breakintoprogram.bsky.social

I am quite happy contributing to the various communitiies I'm involved in with no obligations

However, if you like what I am doing and would like to contribute, you can do so at ko-fi.com/breakintoprogram

I am also raising money in memory of my good friend Geoff Follin in aid of Pancreatic Cancer UK

agon-projects's Issues

I'm working on a sprite editor (firmware 1.0.4)

Hi,
I'm working on a sprite editor called 'spredit', under agon light emulator. (waiting for the real one)
I program it in asm. It will be MIT license. So, where can I share the source code, please ?

ESC not working in disassembler

A listing file

I have a newly minted Z80 (legacy) cross-assembler I'm trying to finalize.
I can assemble the hello world 16 program, using macros for RST.LIS and the like.
I would love to see a listing file of that project from someone that has the Zilog assembler installed.
I don't, for some reasons. What I am really after is to cross check my work against a known standard.

• Wes

C "Hello World" example displays an extra empty parameter when called from BBC BASIC

[disassembler]: decode bug in LD [rp],(Mmm)

agon-projects/C/Disassembler/main.c

Line 779 in e8a375c

sprintf(t, "LD %s,(&%06X)", decodeWord(address, opcode), t_rp[0][p]);

Little copy-pasta bug here, should be:

sprintf(t, "LD %s,(&%06X)",  t_rp[0][p], decodeWord(address, opcode));

Update demos to run on MOS 1.03

Check and update the standard demos to run on MOS 1.03 RC1 and above.

• hello_16: pass
• hello_24: pass
• hello_c: pass
• memdump: fail - pausing after each line, presume checking esc
• disassemble: pass

Add the new C params code to the ASM examples

The 16-bits asm sample should be broken

Unless I misunderstood something (which is very possible) the starting code in init.asm of Hello World 16 doesn't make sense :
_start: PUSH.LIL IY ; Preserve IY
LD IY, 0 ; Preserve SPS
ADD IY, SP
PUSH.LIL IY
LD SP, 8000h ; And set to 8000h, top of the MOS command area

Saving the SP on the stack is not a problem per se, but to restore the SP you will need to restore the SP first, which sounds ... circular. So when LD SP,8000 destroys the SP at the next instruction, the corresponding POP.LIL IY ; LD SP,IY is popping a random value @8000h and 8001h and is not restoring the SP, so the APP crashes.

I seems to me that the SP save and init to 8000h has been added as a quick fix and not tested (commit 3c089b6), but blame me it I am just too ignorant (the ADL/Mixed thing is tricky)

Thank you if someone can explain this to me...

C "Hello World" sometimes displays wrong number of parameters

To replicate

• hello_c param1 param2 param3 param4
• hello_c param1

The first call works, the second call still displays 4 parameters