[Intel-devsys] irmx-80 diskettes

Herb Johnson hjohnson at retrotechnology.com
Thu Aug 15 17:19:48 MDT 2019

Thanks Bill, this is very comprehensive. A few comments.

You might do the easy thing first: read off the single-density disks. 
YOu could do that in CP/M on a CP/M box, or with Dunfield's imagedsk on 
an MS-DOS box. In any event you can verify the disk scheme.

DD M2FM is harder. But you might ask Mark Ogden about it. (now this 
conversation is in the Intel-dev list, Mark can speak for himself.)

He's created a lot of files from Intel disk sources. He's rewritten 
Dunfield tools to run under Windows. He may have a tool to run under 
ISIS, or be willing to write one.


Unpacks an isis .imd or .img file into the individual files.

There is an old CP/M program to read ISIS diskettes, look in the CPMUG. 
I retrieved it decades ago to read DEC RT-11 diskettes. (And I did 
tonight, it's in CPMUG #1. I'll zip it up and send it to Bill.)

No hurry on this, Bill of course, you have a full plate.


On 8/15/2019 5:38 PM, Bill Beech (NJ7P) wrote:
> Herb,
> Indeed I have 5 each 8-inch disks here for RMX/80.
> They are:
> 9500013-03 Ver 1.3, RMX/80 Real-time Multitasking executive for iSBC 
> 80/20 and 80/20-4, SD.
> 9500018-03 Ver 1.3, RMX/80 Real-time Multitasking executive for iSBC 
> 80/10, SD.
> 9700016-03, Ver 1.3, RMX/80 Real-time Multitasking executive for iSBC 
> 80/20 and 80/20-4, DD.
> 9700020-03, Ver 1.3, RMX/80 Extensions for iSBC 80/10, iSBC 80/20, 
> 80/20-4, and 80/30, DD.
> 9700021-03, Ver 1.3, RMX/80 Real-time Multitasking executive for iSBC 
> 80/10, DD.
> The SD disks should not be hard to copy.  The DD may be trickier.  I 
> suspect they are in 3740 format SD but M2FM format DD.  I suspect I will 
> need to write a program for the MDS II to create an image file on the 
> PC.  I need to think about it some more, once I get the other board for 
> Jon H. done and both tested. And I need to get some simulators to 
> compile again and run, at least as far as the monitors are concerned.  I 
> also need to get versions of CP/M-80 to run on the OEM simulators.  I 
> also have several books I have collected to scan. So my queue is pretty 
> full!
> Bill
> On 8/15/2019 9:34 AM, Herb Johnson wrote:
>> Biil, someone asked me about 8-inch diskettes with iRMX-80 on them. Of 
>> course I don't have them. So I started looking around for this. This 
>> doesn't seem to be available "on the Web" or among the intel-dev 
>> archives.
>> I searched your Intel Google Drive and then the archive of our 
>> Intel-dev discussion, for mention of iRMX-80. The only significant 
>> mention is your Sept 2018 purchase of five iRMX-80 diskettes from 
>> eBay. I didn't find subsequent email traffic on your results with 
>> those diskettes. And I don't see any iRMX80 disk images in any of the 
>> by-person folders in your Google drive. I checked Mark Ogden's gethub; 
>> no iRMX80 stuff there. One other reference but it seems a dead end. 
>> I'll detail it as a PS.
>> Bill, it is still a good "find" to have disks with iRMX-80. Thanks for 
>> spending the $$$ to get them. I know doing work is tough for you; 
>> there's no priority for this just because somebody asked me about it. 
>> But what's the status of those physical diskettes, and were you able 
>> to image them in some fashion?
>> Regards, Herb
>> PS: Jon Hales did something with a bunch of Intel diskette 
>> label-descriptions posted around Aug 2018. Mark Ogden commented about 
>> the list, and mentioned this:
>> 950017.06 looks like irmx80 v2.4
>> I have no idea what Jon was doing. But I could not find a disk-image 
>> with that 950017.06 designation.

Herbert R. Johnson, New Jersey in the USA
http://www.retrotechnology.com OR .net
preserve, recover, restore 1970's computing
email: hjohnson AT retrotechnology DOT com
or try later herbjohnson AT retrotechnology DOT info

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