Sharp MZ

I think the RAM chips are socketed rather than soldered so should be fairly easy to pull off the board and clip a new one in. If you're unconfident with hardware, like I am, then you could get a chip removal tool and a chip insertion tool (these are what I use).

Ahmed is using an MZ-80A so should be 48K. Thanks for the extra info Hlide.

Brilliant, thanks !

Hi,

Can new users join the forum at the moment? Do they have to be manually approved? I'm aware of somebody who hasn't heard back about their application to join the forum.

I think I have some Japanese games in Hu-BASIC somewhere, will have to transfer from tape though. Otherwise, you could look at archive.org and search for the Japanese magazines like "I/O" and "Oh! MZ", they sometimes published listings in Hu-BASIC.

HL is already saved in stack and that may be the only thing which needs to be preserved when calling USR - that is, no need to save/restore in the code called by USR. That would be very cool if so! It's annoying having to begin every machine code routine with PUSH AF, PUSH BC, PUSH HL, PUSH DE, etc...

I found this game on a random cassette tape. I don't know who wrote the game but it's not a bad version of Pontoon really. It's for SA-5510. Unfortunately it does seem to be slightly bugged if you play it for long enough (too many nested FOR.NEXT loops) but if someone wants to correct that then feel...

Interesting, thanks! I suppose that means that any machine code routine needs to begin with storing all the registers on the stack in case any which BASIC is using get overwritten. And then obviously POP them back off the stack again before returning to BASIC.

Hey all,

Does anyone know if the USR() command in BASIC actually preserves the Z80 registers and BASIC stack before jumping to a machine code routine?

Think it'd be nice to have a full disassembly of the BASICs really.....

Numbertron is now available to download:

https://spillhistorie.no/2020/11/06/na- ... -for-alle/