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S > SIGNETICS > Instructor 50     


Signetics
Instructor 50

The Instructor 50 was a small system designed to teach the use and programmation of the Signetics 2650 CPU. But it was also a real micro-computer with a tape interface to save and load programs, and a S-100 compatible expansion bus.

It actually belonged to a second generation training computers: unlike its predecessors, it wasn't just a raw electronic board, but offered a real plastic case, S-100 bus, tape-interface, etc....

The built-in display was only a eight-digit, seven-segment LED display... When turned on it displays "HELLO". The keyboard was made of an hexadecimal keypad (16 keys) and function keypad (12 keys). Interaction is also made through 8 parallel I/O switches and their corresponding LEDs.

The only software built-in the system was the monitor (called User System Executive or USE), used to program the Instructor 50. Of course, programmation was made in hexadecimal through a simplistic assembler.

The 2 KB ROM was used to store the monitor. RAM was 640 bytes, but 128 bytes were used by the monitor, leaving 512 bytes for programmation. But having 14 address lines, the 2650 CPU was capable of addressing 32K bytes !

We need more info about this computer ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.
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Little counting error: It got 15 address lines, so capable to addresss 32k (14 would result in 16k). Memory was non continous addressed as 4 pages of 8k each.

          
Thursday 21st November 2013
Hans (DE)

I have a Signetics Instructor 50 that works, but was converted to work on 220V I am looking for the original adapter for it. Or simply a full working unit.

          
Friday 7th June 2013
jp (Belgium)

I have a Signetics Instructor 50 that works, but was converted to work on 220V I am looking for the original adapter for it. Or simply a full working unit.

          
Friday 7th June 2013
jp (Belgium)

 

NAME  Instructor 50
MANUFACTURER  Signetics
TYPE  Professional Computer
ORIGIN  U.S.A.
YEAR  1978
BUILT IN LANGUAGE  Hexadecimal Monitor
KEYBOARD  1 hexadecimal keypad + 1 function keypad
CPU  Signetics 2650
SPEED  895 kHz
CO-PROCESSOR  Signetics 2656
RAM  128 bytes (used by the monitor) + 512 bytes (free for the user)
ROM  2 KB (monitor)
TEXT MODES  LED display - 1 line of 8 characters
GRAPHIC MODES  None
COLOrsc  None
SOUND  None
SIZE / WEIGHT  35 (W) x 25 (D) x 7.5 (H) cm / 1.1 kg
I/O PORTS  Tape interface, S100 compatible expansion bus
BUILT IN MEDIA  None
POWER SUPPLY  External power supply (5V or 8V depending on models)
PRICE  350$ (USA, 1978)





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