!! Preliminary !!


CPU: 80C88 (4.77 MHz)

ROM: 16K bytes

RAM: User RAM: 256K bytes, 512K bytes depending on con-
Video RAM: 16K bytes

CLOCK: Battery-backed clock/calender

Minifloppy Two 3.5"disk drives.
disk drive: Diskettes used:
double sided, double density, 135 t.p.i.
No. of heads: 2
No. of cylinders (tracks): 80
Data transfer rate: 250K bits/sec.

Power supply to 5 V DC (from Power Unit)
Central Unit: 5 V DC (from battery)

System power max. 20 W

Display: 1:2.4 aspect ratio
Liquid crystal display (LCD)
25 lines of 80 characters
25 lines of 40 characters (by selection)
640 x 200 pixels
320 x 200 pixels

Keyboard: 78 keys, including:
10 Function keys
Numeric keypad (integrated into alphanumeric area)
LEDs indicating numeric keypad and upper case mode

Battery: Ni-Cd-Battery set, 5 V
500 charge/recharge cycles
6 hours operation with 10 % use of the disk drives
8 hours recharging time

Interfaces: Parallel (Centronics)
Serial (RS 232C)
Interface for the optional 5.25"disk drive
Common Bus


Ambient Temperature range: from 5 to 35º C (41 to 95º F).
Relative Humidity: from 20 to 80 per cent, non condensing.
Altitude (max.): operating 3000 m. (10,000 feet),
non-operating 10,000 m. (33,000 feet)

Dimensions/ 385 x 276 x 72 mm.
Weight: (15.15 x 10.8 x 2.83 inches)
5,700 Kg (12.5 Ibs).

AC Adapter: Input: AC (voltage, frequency according to the label on the
Output: 5 V DC for battery charging,
5 V DC to system
AC supply current variations tolerated:
Voltage +/-10 per cent
Frequency +/-1 per cent

32/E Installation and Operations Guide

Both the DC and Charge connector are barrel type. Pin is plus, barrel is minus. DC is 5 Volt, Charge is some current limited 12 Volt source.

The 5 Volt power supply is internally converted to +/- 12 Volt, probably for the RS232C port only. The conversion takes place at the shielded conversion board at the top left, connected to the yellow and orange wires.
External power connectors
A topview of the back of the M15. Top left and right are floppy drives. The seven white-wire connector is CN10, the power connector. The white wires come from the shielded conversion board.
M15 internal connector area

The power connectior is CN10. The pinout is:

1. + 5 Volt
2. + 5 Volt
3. GND
4. GND
5. +12 Volt
6. -12 Volt
7. GND?

CN10 closeup
The power supply warns for wrong connection. IMHO with the wrong connection sequence, the computer won't start up at all. I don't know about batttery charging, as I haven't got a battery.
Power supply box
The keyboard uses a 6-pole RJ-11 phone connector. Wire color from left to right; black (GND), yellow, green (sig), red (sig), black, blue (+5V). Data and clock are on green and red. Make sure you test this with a PC (XT) keyboard as AT keyboards are not compatible.
Keyboard connector

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Last update: 2003-11-27