website/content/museum/imsai-pcs-80.md at c6c5bd85634476b519265536921db5ab4f90b8d4

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yann64andClaude Opus 5.5 b274874139 All machines linked to their forum thread (full comment import)

1,289 discussions, 9,527 archived comments; pages no longer carry the comments themselves.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ

2026-10-13 17:26:43 +02:00

2.7 KiB

Raw Blame History

title, categories, types, origins, years, cpus, params

title

categories

types

origins

years

cpus

params

IMSAI PCS 80

Computers

Professional Computer

U.S.A.

1977

Intel 8080 - IMSAI PCS 80

name

image

company

company_name

specs

tabs

forum_thread

photos

oc_id

source

PCS 80

/media/museum/photos/imsai0.jpg

/companies/imsai

IMSAI

label	value
NAME	PCS 80

label	value
MANUFACTURER	IMSAI

label	value
TYPE	Professional Computer

label	value
ORIGIN	U.S.A.

label	value
YEAR	1977

label	value
BUILT IN LANGUAGE	None

label	value
KEYBOARD	Video terminal

label	value
CPU	Intel 8080 - IMSAI PCS 80/30 came with

label	value
SPEED	3 MHz

label	value
RAM	2.25 KB (up to 64 KB thanks to RAM boards, there are 4K, 16K, 32K and 64K memory expansion boards).

label	value
ROM	3 KB (Including monitor)

label	value
TEXT MODES	12x40, 12x80, 24x40 and 24x80 (128 characters of either 5x7 or 7x10 dot matirx fonts)

label	value
I/O PORTS	Serial ports (2) - Parallel Port (1) - Monitor - S100 Bus (8 expansion slots)

label	value
OS	8K DOS based upon CP/M

label	value
POWER SUPPLY	built-in 28AMP power supply unit

label	value
PERIPHERALS	Floppy drives inteface, Single or dual 8'' drives in a separate housing same size as main frame unit

photos

346

title	subtitle	text	image
THE PCS-80 COMPONENTS			/media/museum/photos/imsai_pcs80_components_1.jpg

title	subtitle	text	image
THE PCS 80 MODEL 15			/media/museum/photos/imsai_pcs80_model15_1.jpg

title	subtitle	text	image
THE PCS-80 MODEL 30			/media/museum/photos/imsai_pcs80_mod30_1.jpg

342

url	date
https://web.archive.org/web/20230608155226/http://www.old-computers.com/museum/computer.asp?c=342	2023-06-08

The PCS 80 came with a lot of peripherals: line and character printers, CRT terminals, intelligent keyboards, ACR storage, 8" and 5.25" floppy disks and with several languages: TTY BASIC with OS, 4K, 8K and 12K BASIC, audio cassette BASIC with OS, & a scientifically oriented disk BASIC and level 2 Fortran IV compiler.

Greg Bober stil have an extended working configuration including:
• External 5.25" quad density 380Kb Micropolis floppy with BASIC,
• Faster memory & "I" tempgrade CPU, speed could goto 7MHz,
• 58K 10MHz RAM,
• Custom boot operating system,
• 64K of extended RAM/ported PROM containing the DOS & BASIC operating system to have 1 second versus 30 second floppy boot up,
• Extrernal 12" monitor since 24x80 is hard to see on tiny screen,
• Spare parts.
Numerous photos of his system may be seen here.

2.7 KiB Raw Blame History

2.7 KiB

Raw Blame History