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Al, Just updated my Shugart post but wanted to let you know what I found in my research, It turns out that due to the nature of the data recovery circuitry in the Shugart drive, that it is entirely possible to have a stream of random pulses present at TP16 when there is no floppy inserted or...

Long overdue update: I took a long break from working on the Shugart drive problem; partly frustration and partly other priorities. When I got back into it I ended up getting a lot of help from Herb Johnson (retrotechnology.com). Thanks Herb! The short version of the story is, after chasing a...

Update: I had to leave this problem alone for quite a while (out of frustration and having to deal with other priorities). I got back to it a couple of months ago and eventually figured out (after much circuit probing and testing along with great support from Herb Johnson at...

geowar1, Not sure if the OP is still around but I appreciate your hints regarding the floppy drives. My system is working OK (including the 2 Shugart 801 drives with Rev. 25136-1 PCBs). I wasn't having problems with a RST ERROR but when I first re-started my setup I did have disk problems. It...

Phillip, I was searching for some CCS documentation and came across this post and wondered if you ever solved it. I know it was quite a while back but, to paraphrase the CCS Controller Unique Software manual: "A RST ERROR (Restart Error) is triggered when a program does a restart to a location...

I have a California Computer Systems S-100 system with dual 8" Shugart SA800/801 drives (picture attached) along with a newly purchased Lotharek HxC RevC Emulator. My objective is to be able to boot and run from either floppy or the HxC emulator. My problem is that the 8" floppy drives have...

The saga continues! My two SA801 drives have gradually become unable to read data from my disks. The current status is that my CCS computer is only able to run the MOSS Monitor (basic utilities). This means the most I can do with the floppy drives is basic Seek and Read tests. It looks like my...

Just a follow up on the floppy drives. First item: I have both drives working, but with intermittent problems. I thought I had things going quite well after my initial glitch (above) but both drives are now giving me occasional BDOS Errors (B: drive quite consistently now). I am working from...

Greetings, Just joined the forum today! I'm in the process of reviving my S-100 system, originally put together in 1981, worked on and experimented with until IBM PCs took over in the late 80's and in storage until this week. I vaguely remember that the event that caused me to abandon it was...