Janus Atari ST Emulator

General discussions or ideas about hardware.
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Janus Atari ST Emulator

Post by keli » Thu May 02, 2019 11:01 am

I was reminded of the Janus ISA card that contained a 68000, some RAM, and an MFP on a 16 bit ISA card. The card made it possible to run TOS using a 386 PC as a host providing graphics and input.


From a quick glance at images of the board it looks to me the supporting logic is mostly built out of 74xx series chips (plus 4 GALs). Could this be a good start for a modern remake of the board? Does anyone have high rez images of both sides of the board or even schematics? I looked at the library section of this forum and dev-docs.org, but could only locate installation manuals.

Edit: The DMA I originally assumed was there was actually a MC68901 MFP
Edit 2: Counted the number of GALs to 4

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Re: Janus Atari ST Emulator

Post by rubber_jonnie » Thu May 02, 2019 11:32 am

I'm guessing (And I could be wrong here) that the DMA is not present because the hard drive and floppy access is handled by the PC and whatever software runs on the PC.
Collector of old Atari things:
800XL + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...

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Re: Janus Atari ST Emulator

Post by DrF » Thu May 02, 2019 1:44 pm

I was wondering about if such a thing existed a few days ago. We know there are PC cards for Atari/Amiga but never the other way around.

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