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 ??? -- The contents of this e-mail and any attachments are intended solely for the use of the named addressee(s) and may contain confidential and/or privileged information. Any unauthorized use, copying, disclosure, or distribution of the contents of this e-mail is strictly prohibited by the sender and may be unlawful. If you are not the intended recipient, please notify the sender immediately and delete this e-mail.