Xerox 820-II help needed

[daverand]

I've been working on getting MAME machines fixed. Currently working on the 820-II (there were some issues with the 820, but they were minor). I have the keyboard working and now dealing with the SA1403D interface. Unlike other big board-style systems, the Xerox appears to use the SA1403D SASI controller for both floppy, and hard drive support. The available scanned schematics are quite hard to read.

If you have experience with these systems (or better, good schematics for the host adapter section), please drop me a note.

 

[daverand]

I've got the floppies "working" now, and can boot to the A> prompt. I'm going to need some help with the various 8" and 5" disk formats, though - if you have interest, please let me know.

 

[daverand]

I've posted the PR - everything is fully working now.

But I *am* looking for the MK-83 boot media - this is a different beast, and the Big Board software will not run on it.

xerox/xerox820.cpp: working Xerox 820-II with SASI hard disk and PWB floppy variants by davidlrand · Pull Request #15457 · mamedev/mame

Stack: #15459 (floppy accessor) → #15456 (SA1403D) → this PR. The diff includes those commits until the lower PRs merge; I will rebase as each lands. Brings the Xerox 820-II up to working — includ...

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