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Hazelwood Uniquad

gottahack

gottahack

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Joined
May 14, 2022
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I've been working on a project lately to bring my old Hazelwood UniQuad computer back up to useful operating condition. I bought back in 1985, so that makes it 40 years old. The single-board computer uses the Motorola 68008 processor running at 8MHz with 512K of DRAM. On-board I/O provides four RS-232 serial ports and two parallel ports. Storage is either floppy drive (WD1770 controller) and SCSI hard drive. It's currently operational with a 30MB Seagate ST138N and running OS-9, but I'm going to try to make a CompactFlash to SCSI converter to replace the drive hopefully before it up and dies of old age. The floppy disk is having problems reading back some sectors, so it's going to be hard to get the OS back up and running if the HD dies.
 

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Wednesday, March 26th, 2025 @ 4:07 PM

To: gottahack

Re: Your Hazelwood Uniquad 68008 SBC

GottaHack -
I am currently working on a 68008 CPU SBC for the S-100 / S100 Bus. Creating one because
of my interest in Motorola 68000 Family and the lack of a 68xxx SBC in the current "family" of
the Google Group for S100 here:
https://groups.google.com/g/s100computers
and on John Monahan's website:
http://www.s100computers.com/My System Pages/68000 Board/68K CPU Board.htm

I'm sort-of a "beginner" in S-100 though I did own an Altair 8800 about 40 years ago.

I am interested in any further information about your "Hazelwood Uniquad", beyond what I
can see from the photo you provided. Close inspection makes me think that you chose to
use the 6800-Family chips - Serial, Parallel, Timers, etc. I have been thinking more along
the lines of 68681, etc. Chips a little more up-to-date for 2025. I have also looking at the
RetroBrew ECB Mini-68k - also a 68008 CPU, as well as thoroughly searching for any other
68008 and 68000 CPU SBC's I can find. So anything further that you could Please share
about your 68008 SBC would be Very Welcome to me.
Thanks,
Harry S. Speer
 
I'm working on a 68008 board for my SWTPC clone (Corsham SS50/SS30 boards). I call it the MP-A8 (SS50 bus) and MP-A8A (68Retro SS50ish bus, has 1M on board SRAM, ROM and MC68681). While the MC6850 and MC6821 are 6800 chips, the MC68681 (2681) are 68K chips. They support the DTACK and interrupt handshaking. The MC6800 chips are interfaced by using the MC68K's Peripheral Interface. Circuits look similar but are slightly different. First link below has a good reference for this (MC68B50 & MC68230). I'm not using DRAM.

References:
 
BTW, I used the 68008 and 68000 Hazelwood Uniquad. Nice boxes with OS9/OSK. We used them for development. Would love to get one but will settle for the 68K boxes I do have. :)
 
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