This is your chance to own an operational 'ModelT' ofPersonal Computer history!
Up forsale is this complete workingIMSAI system setup, containing a Godbout Wunderbuss ‘quiet’ active-termination backplane, a TDL ZPU Z80@2.4576MHz, a Netronics 64K DRAM card with added data-in buffer for improved noise immunity, a Tarbell single-density Floppy Controller currently hooked to one CDC 8” floppy drive, a TDL SMB board for I/O (with local memory disabled), and a TDL VDB monochrome ‘TV typewriter’ board set hooked to a 9” NTSC monitor and 'George Risk' ASCII keyboard:
It all works, and boots CPM2.2 from that disk drive with a quick ‘reset’ ‘run’, shown in the monitor picutre running a comprehensive memory test a college friend and I wrote, then running the classic ‘adventure’ game.
Additional included S100 hardware: the original backplane, an extender card, a Bytesaver II, plus an 8K SRAM card to use if the operator wants to go in for toggling in code. Also included is a second CDC 8" floppy drive 'for parts'. It actually reads OK, but needs new felt to write and has trouble accessing track 0 (needs a new stop)-- it is also a little ugly and noisy.
There isa whole stack of original hardware documentation on each part of the system (chassis, each card, and the floppy drives), plus a CD with more documentation and a copy of all 8" diskette data I have. The floppy disks included start witha few booting/working disks and also include a collection of original OEM software disks including CPM 2.2 with full manual set, the MRS OS with documentation, TurboDOS, SuperSoft DIagnostics II, Votrax Software, Deadline Game,Pascal/Z with docs, JRT Pascal with docs, USCD Pascal with several working disks, and Microsoft Basic-80 &Compiler with complete documentation:
Originally, this system was built to run a pair of genuine IBM 33FD floppy drives as from a 3741 system, the ‘grand-daddy of the floppy drive concept’, built into this small teal 19” rack chassis. However, that pair didn’t come thru storage in quite as ‘ready to go’ condition, and will need some particular restoration efforts to get them to work again with the Tarbell controller, but they are ‘historical'!
DISCLAIMERS -- The IMSAI cover has some discoloration along one side, and a few scratches. The monitor 'case' is definitely homebrew. The CDC floppy driver power supplies are just wired-in -- if it is to become permanent, it could use a chassis. Buyer can discuss floppy drive options. This is all 35 years old, and shows a bit of tarnish here and there.
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