> Some are labeled "MRX", "CP/M", "Isis",
"Chip-?","PROM?", I do not
> see any that are labeled "Terak", "UCSD", or "Pascal"
> At least some of them say, "single-sided, soft-sectored double
> density", some say "double sided", so they would physically work in
On Fri, 13 Dec 2019, Dave Mabry wrote:
There are three that appear to be Intel MDS
diskettes.?? The ones
marked ISIS V4.3 is, as I remember, the last version of ISIS-II that
Intel released.?? ASM51 and RL51 appear to be assembler and relocater
for the 8051 series of microcontroller.?? And ICE51 was the in-circuit
emulator software for the 8051 series as well.?? None of the other
labels mean anything to me, but those three are likely for the Intel
Development System.?? Those systems could have single-sided,
single-density FM drives, and/or single-sided double-density M2FM.
The Intel MDS could, of course, run CP/M-80.?? So many of those other
diskettes could have CP/M software/files and still be used on the
Some are labeled double sided. Unless the user punched additional jacket
holes (many of us did), the double sided disks would not have been usable
in a single sided drive. (Unlike 5.25" disks, 8" disks had index hole in
I never had one, but I have heard that there were drives with two sets of
index sensors that could use both.
So, they might be from more than one system.
Unless Dave Barto has some insider information about this group of disks,
I don't see anything to support the contention that they are Terak UCSD
Pascal. Although, if reformatted, they certainly could be usable.
The content? It certainly is not inconsistent with system(s) being used
in some hardware development.
Since none of them are commercial release disks, they may contain personal
content or personal unreleased projects, raising some issues of the ethics
of releasing the content publicly. (ethics, not legality, for trade
secret information that was acquired accidentally)