this was cutting edge technology for 1977
some side vents, unused DB9 and DB25 holes are covered to control air flow, RCA plug is to an external 12" monitor
out of reset, the system askes to boot from extended address PROM, disk or ISMAI prom
IMSAI MPU-B with 8085 CPU, 2Kb RAM (not installed), 2Kb ROM, 8253 Timer, 1 Parallel, 8251 Serial Port and spare card
IMSAI VIO Rev 1 text display, spare card is VIO-D Rev 21, can provide 12x40, 12x80, 24x40 and 24x80 display format sizes
IMSAI 16Kb RAM, very slow 1000nS access time, about 15W of power (3 of these were in the original system configuration)
Tanner Computer 56Kb installed out of 64K RAM card 100nS access time (replaced 3x of above 16Kb RAM cards)
two Digital Research 32Kb extended PROM cards
Micropolis 5.25" 77track, 314Kb Floppy Drive and FDController Card
I/O Technology Multi Port 2 Serial and 4 Parallel Port Card
Morrow Designs Switch Board, 2 Serial, 4 Parallel Ports with 2Kb PROM and 2Kb RAM installed
QT Computers PROM100, Programmer card for 1702, 2708, 2716 and 2732 type UV PROMs
Computer Watch 24hr Clock, Day, Week and Month Calendar uses MSM58232RS
Ackerman Digital's Sound Maker, dual channels of GI AY-3-8910 sound generators
Mullen Computer's Extender to elevate cards high enough to allow live signal debugging
spare 16Kb QT Computer board for 2708s
this system still works, here it is self playing the game called Towers of Hanoi (I've seen it referenced as Brahman's Pyramid a few times)
I let it periodically calculate PI to 58 digits of accuracy for exercise using a MacLaurin Summation Series equation.
I've only verified this to 26 digits... PI=3.141592653589793238462643383279502884193414824689553904675