Altos ACS 8000-7 (8200) mainboard wanted / Shugart 4008 motor pulley

wulfman wulfman at
Sat Jul 11 14:42:01 CDT 2015

no not a software emulator  a hardware emulator you remove the Z80 and
plug in a cable
lets you step through the code test memory and run the board at full speed
hardware emulators are for the debugging of the hardware.

unlike software emulators that run on a host PC that let you run old

i have a ZAX Z80 emulator and a Applied microsystems Z80 emulator for
just that purpose

On 7/11/2015 8:32 AM, Jay Jaeger wrote:
> I use emulators as well, and have written some, but I also enjoy working
> with the real hardware.
> The Altos ACS-8000 series are all Z80's .
> On 7/10/2015 10:05 PM, wulfman wrote:
>> On 7/10/2015 7:50 PM, Jay Jaeger wrote:
>>> Long story, but....
>>> I recently acquired an Altos ACS 8000-2 with an 8100-01 mainboard (which
>>> currently is not functioning).   Acquired it on eBay where it was
>>> represented as an ACS-8000-7, along with an Altos 8000-7A 29MB hard disk
>>> (a Shugart 4008).  The hard disk was fine, but the computer wasn't the
>>> one shown in the photo.  (I arranged for a partial refund.  At least the
>>> disk was the one in the photo.  ;) ).
>>> I was wondering if anyone had an 8200 mainboard (the one with the logic
>>> for the hard disk on it) that they would be willing to sell at an
>>> affordable price?
>>> Also, I have a second Shugart 4008 hard disk, but it was configured for
>>> 50Hz - so the motor pulley is the wrong size.  Anyone out there have a
>>> dead 4008 that they would be willing to have part with its motor pulley
>>> and belt (and get the 50Hz set in return)?  (For example, I saw a
>>> posting on youtube with a wobbly platter set that probably is a good
>>> candidate...  ;) ).
>>> Any tips on troubleshooting the mainboard on a double density Altos 8000
>>> computer (mainboard 8100) would also be appreciated.  I have already
>>> reseated the chips, polished the tarnish off some chips the apparently
>>> had silver-plated pins, etc., to no avail.  Have dumped the ROM (2708).
>>>  Next plan is to disassemble that, and slap a logic analyzer on "J2"
>>> which has all of the bus signals on it.
>>> Thanks in advance...
>>> JRJ
>> This is why i collect cpu emulators. I have almost every kind made. I do
>> however need some jumper headers for a 68000 HMI unit
>> thats set for 68008 mode but thats another story.
>> what main CPU does this use, 8080 or a Z80 or ???

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