IBM ROM Basic - option ROM for PC clones

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Reply 20 of 20, by analog_programmer

Posted on 2025-09-14, 20:33

analog_programmer Offline

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analog_programmer wrote on 2025-09-14, 08:50:

P.S. I may try something to see, if I can make the Tronix's OpROM compression from this post to be applied on these...

P.S.2: I had a partial success with the 32 kB compressed versions and the lz4 decompression stub from this post - the boot loader was executed, but ROM BASIC didn't load. Then I tried the "COM2ROM" form this post with the default settings for starting segment and starting offset with no success - no boot loader was executed. So, probably I need the right starting segment and starting offset memory addresses.

Changed tactics and now finally everything works. 32 kB size for OpROM is better than 64 kB 😀

Here are three 32 kB versions of ROM BASIC OpROMs with Predator99's boot loader compressed by Tronix's method for XT clones:

The attachment OpROM IBM Basic for Clones 32 kB.zip is no longer available

The attachment OpROM PRAVETZ-16 BASIC For Clones 32 kB.zip is no longer available

The attachment OpROM PRAVETZ-16 BASIC For Clones (translated EN) 32 kB.zip is no longer available

Enjoy!

P.S. In case if someone's sick and tired of ancient BASIC programming - I made compressed no-boot drive OpROMs of some already published here ancient CGA DOS games: Re: CGA game on option ROM

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