Click Here to visit our Sponsor
The Latest News ! The History of Computing The Magazine Have Fun there ! Buy books and goodies
  Click here to loginLogin Click here to print the pagePrinter ViewClick here to send a link to this page to a friendTell a FriendTell us what you think about this pageRate this PageMistake ? You have mr info ? Click here !Add Info     Search     Click here use the advanced search engine
Browse console museumBrowse pong museum


Ready prompt T-shirts!

see details
C64 maze generator T-shirts!

see details
Spiral program T-shirts!

see details
Pixel Deer T-shirts!

see details
BASIC code T-shirts!

see details
Pak Pak Monster T-shirts!

see details
Pixel adventure T-shirts!

see details
Vector ship T-shirts!

see details
Shooting gallery T-shirts!

see details
Breakout T-shirts!

see details


Digital Equipment Corporation

The Rainbow 100 had a proprietary floppy drive format. Disks formatted for the Rainbow 100 could not be read or written to by other PC computers, even though materially they were the same type of 5'' disk.

Chris Ryan reports:

There were two versions : the model 100 and the model 100+. The 100 had 64 KB soldered RAM and the 100+ had 128KB with a socket expansion for an other option board.

The system was triple boot (in BIOS, and could be set for automatic default boot preference on 100+) and booted in either CP/M, DOS, or VT100 mode.
When booted in DOS, the Z-80 acted as an I/O co-processor for the 8088 side, and visa-versa for CP/M mode.
The 8088 could also be upgraded with an NEC V-20 chip, but it involved either doing an E-PROM hack (published) or manually selecting the boot mode each time. (It was due to the V-20 being so much faster, and the post used a step/increment timing sequence, the system would respond faster than the number of clock cycles it was told to wait until looking for a response.)

MANUFACTURER  Digital Equipment Corporation
TYPE  Professional Computer
YEAR  1984
KEYBOARD  Full-stroke keyboard with function keys, editing keypad and numeric keypad.
CPU  Intel 8088 + Zilog Z80 A
SPEED  4.81 MHz (8088) / 4 MHz (Z80)
RAM  64 KB (up to 896 KB)
ROM  24 KB (includes self-diagnostics)
TEXT MODES  40 x 24 / 80 x 24 / 132 x 24
GRAPHIC MODES  320 x 200 / 640 x 200 / 800 x 240
COLORS  16 among 4096 (optional)
SOUND  Beeper
SIZE / WEIGHT  48.3 (W) x 36.3 (D) x 16.5 (H) cm (system unit)
I/O PORTS  2 x RS-232, keyboard, monitor
BUILT IN MEDIA  Two 400 KB 5.25'' disk-drives
OS  MS DOS + CP/M (+ CP/M 86 - Prologue )
POWER SUPPLY  Built-in switching power supply unit
PERIPHERALS  3 expansion slots
PRICE  £2300 (U.K., 1984)

retro computing t-shirts and goodies
3D Cubes
BASIC code
C64 maze generator
Pak Pak Monster
Pixel adventure
Pixel Deer
Ready prompt
Shooting gallery
Spiral program
Vector ship

Related Ebay auctions in real time - click to buy yours

Click here to go to the top of the page   
Contact us | members | about | donate old-systems | FAQ
OLD-COMPUTERS.COM is hosted by - NYI (New York Internet) -