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SvOlli

ROMulator @ Atari 2600

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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...

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29 minutes ago, SvOlli said:

...before I come the the conclusion that this is a dumb idea. ;-)

Why is it a dumb idea?

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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.

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Posted (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 by Thomas Jentzsch

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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.

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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!

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