IBM 4331 [Was: MFM floppy and HD emulator DREM]

Ethan Dicks ethan.dicks at
Mon Oct 17 17:29:35 CDT 2016

> On Mon, 17 Oct 2016, Guy Sotomayor Jr wrote:
>> Oh and did I mention that I?ve acquired (just need to move it) an IBM 4331
>> mainframe including *all* of the peripherals (3340 disk drives + lots of
>> packs, 1403 printer, IBM tape drives, card reader/punch, 029 keypunch,
>> manuals, terminals, etc, etc)?

Nice.  We had a 4331 at Software Results from some time in the early
80s (it was already set up when I started in 1984) until it went
off-lease in the late 1980s.  We used it for, essentially two things -
debugging connectivity to our own products (3780, HASP, and SNA
connections) and for circuit boards design for our products (using
PADS?)  It was the smallest machine we could get that was an SNA PU
Type 5 with a PU Type 4 I/O front end.  We didn't even come close to
making it work hard.

Ours just had a couple of disks, some sort of interface for the
printer and some 3278 tubes (3174?), and a tape drive.  No punchcards.
It had the same datacenter footprint as our largest VAX system that
ran 50+ users.



More information about the cctalk mailing list