zilog system 8000

I have one model 21 and one model 11. Finch drive and ST506 drive respectively. Not sure about the status of disks, but I have a spare Finch drive. I also have three install tapes. One Sadie 3.5 and two ZEUS 3.21. When time permits I will read those. AJ Palmgren read a tape with a tar archive I made myself on this machine many years ago. The ouput I got from AJ was Saleae logic analyzer dumps. One per track read. He is using a quite standard Wangtek 5099 drive where he is able to control the head in more detail. Some dumps were from tracks which were spot on one of the tracks on the tape. Others were not a full hit. I had to test all of them. I created a small program that decoded the MFM data off the tracks. It processed gigabytes worth of samples. Checked the CRC and wrote it to file so I could recover the archieve. http://www.datormuseum.se/computers/others/zilog-s8000/extract-s8000-tapes Credits goes to AJ Palmgren for reading the tape and to David Gesswein from whom I stole and modified the MFM decoder. And as Al wrote: No it is not at all QIC. The drive has four fixed tracks and the encoding is MFM. /Mattis fredag 20 juli 2018 skrev Al Kossow via cctalk <cctalk at classiccmp.org>: