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I'm completely stumped. I can not get an SA850 drive to read the 2nd head on a DOS machine. This drive should act like an 80 track drive up till tk 77 but it fails when it switches to the 2nd head on tk 0. It formats side 0 then fails after switching to side 1 with invalid media (general...

I need a chip 70200-11 from a Televideo 910, 912, 920, 925, 950

Yes, I can R/W 3.5 and 5.25 DS drives on this Adaptec controller just fine. But can't confirm 8". 8" SS works fine, IMD, 22DISK, ANADISK.

Yep, trying both SS and DS media with the index hole more off-center. I've tried configuring it as a 1.44 but I wouldn't expect that to work due to the spindle speed of 300RPM, the software can tell by reading index. I'm just stumped, I should be able to config an MSDOS machine for 1.2M drive...

Wow I'm just stumped here trying to prove my 8" SA850 can actually r/w head #2. If there is something wrong with my setup this would prove why I'm getting a bogus ibex disk reading on imagedisk. I thought I could just format a DSDD 8" diskette in DOS as 1.2m and have it error out at tk 78 but...

Update, I'm trying to confirm my SA850 drives can access the 2nd head and am having lots of trouble. Adaptec 1522CF on a DOS PC with imagedisk and 22disk and anadisk. No trouble reading/writing 5.25, 3.5 drives. I'm using the S2 option jumper, everything looks right. I SHOULD be able to...

To fully test my hardware, I'm looking for an 8" DSDD .IMD file that I can write with ImageDisk that also has a definition in 22disk so I can DIR and COPY to check both sides for data. Wasn't able to find anything obvious in Dunfield's archive. I don't really see a way in IMD to to do an...

So here's anadisk with the IBEX 7202 boot disk: It shows all side 1 blank, CPM dir at 37 (which we knew), Says 8x1024 which is right, except 1st track. Says it's a non-system disk, but it is.

I don't understand the imd files for these disks. All the data for side 2 is "N". I see side-select pin 14 on 50pin drive connector going high/low as it tries to read. I don't have a non-ibex DSDD disk to read for testing. These disks are suppose to be DSDD with 8 sectors per track at 1024 bytes...

Ok, I re-read the IBEX 7202 and 7301 disks. Hopefully this got both sides. I had to set IMD's "FULL ANALYZE" to do this. Please check it out and feedback. The 7202 disk had no errors. (this is for a dual FD machine) The 7301 disk had errors on Trk 7. (this is a FD/HD machine)...

Mid-morning update - My hardware is good, jumpers on SA850 are right. But what is happening is that IMD is reading track 0/head 0 and finding data (CPM boot) at SD, Then moving to head 1 of that track, finding E5's and concluding the rest of the disk is empty, and finishes. Of course this...

Morning update - I've about decided that I had the drive jumpers right but that IMD is reading Track 0/head 0, reading that fine, Then going to Head 1 and finding only EF's, and saying done. That would explain what I'm seeing. So today I'm going to investigate the Full Analyze option of IMD...

I have some new progress on this - thanks for all yalls help: MarkO on FB CPM group noticed the data in the iBex 7301 8x1024 IMD file is the same on both sides. I checked and that appears to be true per IMDV. -Please confirm. Which means my disk isn't head selecting. So I goofed with jumpers...

That looks like a pretty good directory you got but I wonder how cpmls did it? The disk parameters of 77 tracks, 26x256 mfm are right but I need the CPM parameter block to read the DIR in 22DISK. 22DISK needs the CPM parameters which start with bit shift to define the dir and files. BSH 5 BLM...

This sounds similar to my IBEX 7202 CPM computer. I've lost the disk drives but they were Dual 8" DSDD. I have some disk images. The system could work with 8x1024 DSDD disks or 26x256 disks. Let us know the status of this project.

This .IMD file was created using Imagedisk and an SA850 drive reading a diskette that was written by my IBEX machine 40 years ago. I'm trying to preserve some old disks and want to use 22DISK but need a definition that works. I've gotten as far as getting a DIR. IBEX 7202 was the dual 8" 1.2m...

Would someone care to solve parameters for this IBEX7301.IMD ? I've tried everything I can think of and calculate. I can get close enough to DIR with 22DISK but can't copy or TYPE files with 22DISK. This is a disk worth preserving. So far I know: CPM 2.2 for IBEX 7301 computer 8" Double...

Mike: That's cool. I have an affinity for development systems and have an intel MDS888 and MDS-II. Would like to ultimately get an exorbus system and a Mostek. Just ran across your documentation of it, very good.

IMD files created from the original disks along with all their boot sector information would be a good addition to bitsavers. Can that happen? I'm moderately concerned about attempting to recreate IMD files in various other ways. Again, I have gotten all the individual files from the RT11 and...

From your previous postings I've collected all the files within the file structures to create the 3 diskettes, but not any boot tracks for the 2 CPM diskettes. I'll await my D100Q shipment and maybe I'll be surprised that the diskettes are included, and if they are I will IMD them. Should...