adam242 Posted September 26, 2021 Share Posted September 26, 2021 Is it possible to set Altirra BASIC to run at regular Atari BASIC rev C speed? I would LOVE to burn an EPROM with Altirra BASIC in my XE remake but not if my favorite BASIC games will become unplayably fast.. Quote Link to comment Share on other sites More sharing options...
Rybags Posted September 26, 2021 Share Posted September 26, 2021 It'd probably be easier to do an asm VBlank routine that has a delay loop for a selectable number of scanlines. Though plenty of potential for conflict with games that have their own asm routines, DLIs or custom VBlanks. Maybe something that can be called with a USR, and sits at the bottom of the stack or in the printer buffer. Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted September 26, 2021 Share Posted September 26, 2021 You'll need an adapter PCB anyway to use common EPROMs to replace the BASIC ROM, so you can have the best of both worlds... Burn a 16K EPROM, and install a switch to toggle between Atari BASIC rev C and Altirra BASIC... Install a 32K EPROM and add Atari Assemberl/Editor and an 8K Game like Star Raiders or Frogger. Here's the PCB of the adapter: https://store.go4retro.com/2364-adapter/ Here's 8K games tested to work as an 8K basic ROM replacement: https://atariage.com/forums/topic/280177-game-roms-that-work-in-place-of-basic/?do=findComment&comment=4059311 If you don't have the means to program one yourself, PM me I can help you out. 4 Quote Link to comment Share on other sites More sharing options...
FifthPlayer Posted September 26, 2021 Share Posted September 26, 2021 (edited) I think you could just plug an actual Atari BASIC cart into the XE and it will override the built-in Altirra, for the occasions you want to play games that need the slower speed. Edited September 26, 2021 by FifthPlayer 3 Quote Link to comment Share on other sites More sharing options...
adam242 Posted September 27, 2021 Author Share Posted September 27, 2021 19 hours ago, Nezgar said: You'll need an adapter PCB anyway to use common EPROMs to replace the BASIC ROM, so you can have the best of both worlds... Burn a 16K EPROM, and install a switch to toggle between Atari BASIC rev C and Altirra BASIC... Install a 32K EPROM and add Atari Assemberl/Editor and an 8K Game like Star Raiders or Frogger. Here's the PCB of the adapter: https://store.go4retro.com/2364-adapter/ Here's 8K games tested to work as an 8K basic ROM replacement: https://atariage.com/forums/topic/280177-game-roms-that-work-in-place-of-basic/?do=findComment&comment=4059311 If you don't have the means to program one yourself, PM me I can help you out. That's not a bad idea.. The motherboard in question already accepts standard EPROMs and EEPROMS, so this should be even easier to implement. Quote Link to comment Share on other sites More sharing options...
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