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 !
主要参数编辑本段回目录
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 |
COLORS | 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) |