Jump to content
Sign in to follow this  
adam242

Altirra BASIC at normal speed

Recommended Posts

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..

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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.

  • Like 4

Share this post


Link to post
Share on other sites

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 by FifthPlayer
  • Like 3

Share this post


Link to post
Share on other sites
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.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...