Altos ACS 8000-15A

Jay Jaeger cube1 at
Fri Jul 10 21:42:00 CDT 2015

A couple of things.

Firstly, I noticed that my Mini-Pro could only read SOME of the 2716's I
had, not all of them.  So, just because it read as zeros might not mean
it really is.

Secondly, there is a 2K bit Altos-related ROM available at

There is a link to a zip file.  Look for the one labeled ALTOS.ROM in
the zip file - is is the right size (2K Bits).  It is "Monitor Version
6.05" - but it looks like is for a system that could have a hard disk.

I have an Altos 8000-2 (double density) that I just acquired off eBay
that is in a similar state - no floppy activity, nothing on the
terminal.  But I was able to dump its rom with an 8K Bytesaver - haven't
disassembled it yet.

If you weren't aware, Doc on the 8000 series is available at .  But I don't think it covers the 8500.


On 6/21/2015 10:43 AM, Chris Osborn wrote:
> Thanks to Josh Dersch I now have a good copy of the ROM for the Altos 8500 boards. I’ve put it up online here:
> I burned it and popped it in but my Altos still doesn’t come up. Nothing is output on console 1. I’ll have to start walking through everything and check if the Z80 is getting clock, see if it’s running, and so on. I’m sure I can get it fixed, it’s just going to be more work. :-)
> --
> Follow me on twitter: @FozzTexx
> Check out my blog:

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