+SvOlli Posted June 13, 2021 Share Posted June 13, 2021 I've just watched the latest episode of Adrians Digital Basement on YouTube, where he tool the ROMulator for a testdrive on a VIC-20. So there I got the idea: replace the 6507 of the 2600 with a self-built 6507 to 6502 Adapter, and then use the ROMulator to create a VCS with an addressable space of the full 64k without banking. So I ordered one, before I come the the conclusion that this is a dumb idea. I also need to figure out which one of my 2600s will be the hone hosting the Frankensteins monster, or if I want to buy a new one... 1 Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted June 13, 2021 Share Posted June 13, 2021 29 minutes ago, SvOlli said: ...before I come the the conclusion that this is a dumb idea. Why is it a dumb idea? Quote Link to comment Share on other sites More sharing options...
+SvOlli Posted June 13, 2021 Author Share Posted June 13, 2021 23 minutes ago, Thomas Jentzsch said: Why is it a dumb idea? Well, I stated "come" not "came". So I'm still convinced that this will be fun: having a Raspberry Pi Zero W integrated as development system and to configure the behaviour of the "addressmapping". But there might be coming some major drawbacks, beginning with Stella being unaware a CPU with an 16-bit address bus. So there are a couple of downsides, but I still would consider this fun to build. Also the Raspberry Pi can be used to trigger reset, irq and/or nmi for debugging purposes. Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted June 13, 2021 Share Posted June 13, 2021 (edited) Ah, missed the details. Well, a 64K addressing space seems similar to a 7800, no? I remember that I modified my Thrust ROM for @Eckhard Stolberg to be tested on real hardware (7800) back in 2000. Edited June 13, 2021 by Thomas Jentzsch Quote Link to comment Share on other sites More sharing options...
+stephena Posted June 13, 2021 Share Posted June 13, 2021 10 minutes ago, SvOlli said: But there might be coming some major drawbacks, beginning with Stella being unaware a CPU with an 16-bit address bus. Stella passes a full 16-bit 'uInt16' parameter for the addresses, which are masked down to 13-bit in the various subsystems. It should be easy enough to modify the masks to suit your needs. Quote Link to comment Share on other sites More sharing options...
+D Train Posted June 13, 2021 Share Posted June 13, 2021 3 hours ago, SvOlli said: So I ordered one, before I come the the conclusion that this is a dumb idea. this is what separates the high achievers from mere mortals! 2 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
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.