CONTENTSPage
 
Technical Specification2
Safety Test 2
Self-Test Activitation3
Cabinet Drawing & Parts List4&5
Flow Charts6-9
P.C.B. 10 & 11
Disk Drive Diagrams12 -14
Software Errors15
Diagnostic Flow Chart16
Self Diagnostic Tests17
Circuit Diagram18 & 19
Electrical Parts List20

TECHNICAL SPECIFICATION

MEMORY:

RAM 128 Kbytes as 8 x 16K pages
ROM 64 Kbytes as 4 x 16K pages

CPU:

Z8OA running at 3.54690MHz

SCREEN:

256 x 192 Pixel resolution
24 x 32 Color resolution
8 colors foreground,
8 colors background,
plus intensity and flash settings
Start of buffer switchable
Independently controllable border

SOUND:

Three voices tone and/or noise with 16 envelope settings
One voice CPU generated
Output via TV, Audio or Monitor socket

KEYBOARD:

58 key full travel QWERTY keyboard

STORAGE:

Integral 3 inch disk drive, single-sided reversible media
40 track, 9 sector, 512 bytes/sector.
CP/M compatible structure
Optional second disk drive
Volatile RAM Drive
Interface for external cassette recorder

FIRMWARE:

48K Spectrum BASIC (compatibility mode)
128K Spectrum ZX+3 BASIC, integrated with +3 DOS
Storage selection by reassignable default with optional override

INTERFACES:

UHF PAL TV port
Serial interface (RS232) port
Parallel Printer port (8 bit)
Auxiliary interface port
RGB Monitor (and PERITEL TV) port
MIDI output port
Two Joystick ports
Audio Out/Cassette port
Second Disk Drive port
Expansion I/O port (full Z80 bus)

SAFETY TESTS (POWER ADAPTOR)

Please note: when any work is completed on this unit, the following safety tests must be completed to ensure continued electrical safety.

  1. Flash test from the mains lead with live and neutral joined together to all accessible external metal points at 4kV.
  2. Meggertest at 400V DC from the mains lead with live and neutral joined together to all accessible metal points. The reading must not fall below 2 Mohms.

N. B. Ensure the Power Adaptor is switched on when both these tests are carried out.

AMSTRAD PLC
BRENTWOOD HOUSE, 169 KINGS ROAD, BRENTWOOD, ESSEX CM14 4EF.
Telephone: 0277 230222. Telex: 99541 7 Amaele G.

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