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Print Peeks to determine ROM version?

Posted: Sat Nov 30, 2019 6:46 pm
by Erm
Hello. I've just installed a ROM-el in a Power 3000. I wrote 4 different ROMs to it the other week. I used the following:

Lambda 8300 ROM modded for ZX81 compatibility
Lambda 8300 (Std)
Power 3000
Power 3000 with colour kit commands

And I've now forgotten in which order I put them on the ROM! Obviously the ZX81 compatible one seems to show the familiar ZX81 'K' so that's easy to spot. The others all show the 'READY' at the top left.

Without having to go through the ROM data to find differences, does anyone have an easy way to tell which is which, e.g. with Print Peeks or something?

Re: Print Peeks to determine ROM version?

Posted: Sat Nov 30, 2019 6:58 pm
by mrtinb
Number 2,3 and 4 are the same. That’s why they all show READY.

Re: Print Peeks to determine ROM version?

Posted: Sat Nov 30, 2019 6:59 pm
by Erm
What, exactly the same in every way, surely not?! What are the colour kit commands and how so I tell for example if that one is selected?

Re: Print Peeks to determine ROM version?

Posted: Sat Nov 30, 2019 7:03 pm
by mrtinb
Look at this post
viewtopic.php?f=18&t=2839&start=10#p31682

You have number 5,2,2,2.

It’s just that ROM 2 has many names.

If you still have the ROM files on your pc, you can check their CRC, to see if they are equal all the way through.

Re: Print Peeks to determine ROM version?

Posted: Sat Nov 30, 2019 7:06 pm
by mrtinb
If you type the command

Code: Select all

INK 1
and don't get an error, you have the color ROM.

Re: Print Peeks to determine ROM version?

Posted: Sat Nov 30, 2019 7:09 pm
by Erm
Right, so basically I just need 2 ROMS on the chip. One 'normal' one and the ZX81 compatible version. I think that's the easiest thing to do.

Re: Print Peeks to determine ROM version?

Posted: Sat Nov 30, 2019 7:14 pm
by mrtinb
You can have 3.
  • Lambda ROM first version without color commands
  • Lambda ROM second version with color commands
  • ZX81 compatible ROM for Lambda

Re: Print Peeks to determine ROM version?

Posted: Sat Nov 30, 2019 7:15 pm
by mrtinb
You could also try one of the Russian ROMs with READ, DATA, RESTORE, but I have no documentation for them.

Re: Print Peeks to determine ROM version?

Posted: Sat Nov 30, 2019 7:20 pm
by mrtinb

Code: Select all

PRINT PEEK 999
  • Original Lambda ROM gives: 23
  • Lambda second ROM with color commands gives: 63
  • ZX81 compatible ROM gives: 33

Re: Print Peeks to determine ROM version?

Posted: Sat Nov 30, 2019 8:50 pm
by Erm
Excellent, thanks.