View Full Version : IMS 8000 floppy controller pictures

October 2nd, 2016, 06:45 AM
Hi - I had a PM from a member asking about floppy controller model numbers for the IMS 5000 / 8000 machine. I have an IMS8000 so took some pictures of the floppy controller/8" drive and thought I would share...


October 2nd, 2016, 06:51 AM
...Sorry, I just notices some pictures are upside down. I tried editing the post with corrected pictures but there was no change after pressing the save button. Oh well - you should get the gist?

October 2nd, 2016, 07:58 AM
The IMS c00401 is the standard 8" floppy controller for the IMS 8000. The smaller model - IMS 5000 - uses the C00431 floppy controller for 5,25" floppies.
Early IMS 8000 were configured with the Shugart 800 single sided drives, later with the double sided drives. The IMS 5000 uses both double sided 5,25" drives but also 'Quad-drives' with 720kb like the Tandon TM100-4 or the Teac FD55F. Later especially for Turbodos!

October 2nd, 2016, 09:21 AM
Every surviving IMS board I've ever seen has weathered the years in great condition. I've never found one that had bubbling solder mask or lifted traces. They seemed to use very high quality components and meticulous assembly.

What is the smaller connector to the right of the 50pin floppy ribbon cable for? I have not seen that connection on the board populated on other ones.

I believe I have a TurboDOS 1.2 boot disk for this machine if you are interested.

Anyone else have a spare floppy controller like this one laying around? PM me.

October 2nd, 2016, 11:01 AM
Not sure what the second connector is for. I will dig out the documentation and report back.

The data sheet for the NEC D8257C-5 DMA Controller is Here:


and for the NEC D765 floppy controller is here:


for anyone interested.

A Turbo DOS 1.2 boot disk would be most interesting! If you mean a copy I can send you a blank 8" floppy? Are you in the US? I am UK based.

October 2nd, 2016, 11:12 AM
...oh you are quite correct about the quality of Industrial Microsystems kit. This machine is built like a tank! Its 36 years old now and still on its original linear power supply. All I had to do when I got it off ebay 9 years ago was make a null modem cable, work out hyperterminal settings, swap the a drive for the b drive as a: was non functional and re seat some creepy chips and then it booted up to the cp/m prompt! It actually took me about 2 weeks to work all that out but I was elated when it finally worked!

October 2nd, 2016, 03:25 PM
A Turbo DOS 1.2 boot disk would be most interesting! If you mean a copy I can send you a blank 8" floppy? Are you in the US? I am UK based.

I found the box of disks for the IMS 8000, there's 3 different TurboDOS 1.2 boot disks, 2 are single sided, 1 is double sided. Also in the same box is WordStar for the system CP/M 2.2 and ZBasic. Further, there are 2 disks labeled MP/M 1.0, but I cannot say for sure if it's for the IMS 8000, but it was in the same box. Check the ROM chip on your 440 I/O card, I believe TurboDOS used IPL V1.4. TurboDOS also needs 64K of memory, do you have that?

October 2nd, 2016, 03:40 PM
I defiantly have 64Kb RAM, I will check the ROM version in the morning and let you know - that box sounds most interesting. I was thinking of starting a website for each of my vintage computers, documenting getting them up and running, pictures, video, documentation and software. This stuff needs sharing with others here on the forum. I already have a website on a different subject..

http://marconitype730vintagecommunicationsreceiver.itsupp ortsolutions.co.uk/

I could do something similar for the IMS 8000 and share disk images or something or offer to post out copied disks if people send me blank disks or something? This is non profit by the way. That site I made for a vintage radio I sold on ebay. My computers aren't for sale though!

October 2nd, 2016, 06:34 PM
Are you able to read/write 8" disk images? I could just email you the images of these disks if that's the case.

October 2nd, 2016, 07:45 PM
Are you able to read/write 8" disk images? I could just email you the images of these disks if that's the case.

As I had an IMS5000 years ago I would like to get the images too.
I have no IMS any more but will store the images at


for archiving and can test the 8" tandon drive I have.

October 2nd, 2016, 10:40 PM
At the moment all I can do is read/write real disks. I can have a go at building Dave Dunfields adapter though and see if I can get the Compaq portable II I have working in some fashion to read the 8" floppy drive. Having all those disk images would be an incentive!