Technical Specification - AMSTRAD CPC6128 Service Manual

TECHNICAL SPECIFICATION
LSI CHIPS:
Z80A processor running at 4MHz
128K bytes of RAM arranged in two 64K banks (over 41K
available to user in BASIC, 61K available TPA to
CP/M Plus)
48K bytes of ROM containing BASIC, the operating system
and disc extensions
6845 CRT controller device
AY-3-8912 sound generator chip 3 voice, 8 octaves
8255 parallel |/O device
7653 floppy disc controller
DISPLAY SPECIFICATION:
Display Mode Mode 1 Mode 2 Mode 3
No. of colours 4 from 27 2from 27 16 from 27
Vertical dots 200 200 200
Horizontal! dots 320 640 160
Horizontal characters 40 80 20
KEYBOARD:
74 Keys — qwerty style, numeric cluster, cursor and copy cursor,
return, enter, shift, caps, lock, tab, delete, clear, control.
CASSETTE HANDLING:
Write speed software selectable — 1K baud or 2K baud, read speed
automatically established by software. Motor on/off contrclled by
software.
ADD-ON ABILITY:
Additional compact floppy disc drive system, type FD-1.
Centronics compatible printer.
Joystick(s).
Various peripherals including up to 252 additional 16K ROMs.
EXTERNAL SOCKETS:
PCB edge connectors for general purpose expansion and Centronics
parallel printer.
Disc drive 2 socket (Use DI-2 connecting lead).
9 Pin D-type socket for joystick (Amsoft type JY2).
6 Pin DIN Socket for
— RGB and sync
— Luminance + sync
5 Pin DIN socket for external cassette recorder. (Use CL1 lead).
3.5mm stereo socket for stereo sound output.
5mm plug and lead to connect 12V (disc) power socket on the
monitor.
5mm socket for CPC6128 5v power supply (supplied exclusively
from monitor).
DIMENSIONS (mm):
w h d
Keyboard 510 48 170
CTM644 375 340 365
GT65 305 315 335
Joystick 90 170 100
Modulator 120 70 170
WEIGHTS (Kg):
Keyboard 2.0
CTM644 10.6
GT65 6.3
Joystick 0.3
Modulator 1.4
POWER SUPPLY:
Screen System: 240V AC 50Hz (keyboard and disc drive power
supplied by screen system).
CP/M usually assumes an 80 column screen is available. The
CPC6128's ability to present text in 80 column format is a prerequisite
for the majority of CP/M applications.
Disc System Specification:
The disc drive is a 3 inch system, conforming to the Hitachi/
Panasonic standard. The software is configured for a 12mS step
rate, and 30mS settling time.
The system is designed to control a maximum of 2 drives. A ROM
contains the extensions for AMSDOS and the machine dependent
elements of CP/M and Dr LOGO.
The ruggedly constructed 3 inch discs are usable on both sides,
each side is provided with a reusable write protect clip which is slid
into position as required.
AMSDOS & CP/M Plus
AMSDOS is a disc operating system which expands Locomotive
BASIC, adding additional commands to make full use of the disc files.
AMSDOS enables BASIC programs to access disc files in the same
manner as cassette files, in fact the same commands are used with
file names conforming to CP/M and CP/M Plus conventions.
AMSDOS and CP/M both share the same file structure and can read
and write each other's files. The Digital Research CP/M Plus
operating system is supplied with the CPC6 128, permitting the user
to access the wealth of applications software written to run under
CP/M. In addition to the usual CP/M Plus utilities, additional
features have been included for the CPC6128.
Disc Organisation:
Both AMSDOS and CP/M Plus support two different disc formats:
System format, and DATA only format.
Format selection is automatic on disc access. Both formats use the
same framework, but have different sector configurations.
Common to all:
Single-sided, double density.
512 byte sector size.
40 tracks. a
Sectors interleaved 2:1.
SYSTEM format:
The most frequently used format, since CP/M 2.2 and CP/M Plus
may only be loaded from a system format disc. 2K is used for the
directory, and 9K reserved for the system.
9 sectors per track.
2 reserved tracks for CP/M.
169K byte file capacity.
DATA only format:
All the tracks are used to store data.
2K bytes reserved for the directory.
9 sectors per track.
No reserved tracks.
178K byte file capacity.
The CPC6128 is compatible with programs developed for Amstrad
CP/M 2.2 and willrun Amstrad CP/M 2.2 discs. Programs developed
specifically for CP/M Plus with GSX will not run on Amstrad CP/M
2.2. The term CP/M Plus is synonymous with CP/M 3.0.
Either side of'an AMSTRAD CP/M Plus or AMSDOS disc may be
accessed by the disc controller, depending on which way round the
disc is inserted.
Please note that while every care has been taken to ensure
compatibility with existing CP/M software, some packages available
make use of undocumented features of the CP/M operating system,
and these may not be supported by the CPC61 28 implementation.
Protected cassette files may not be occupied on disc, and care
should be taken to observe the copyright conditions of any software
when transfering programmes between cassette and disc.
In keeping with our policy of continually improving our service, and
the technical quality of our products, we reserve the right to change
component types, manufacturers, sources of supply or technical
specification at any time.
Keyboard/computer unit, Colour Monitor, Monochrome Monitor —
Designed in U.K, Made in Korea.
Joystick — Designed in U.K, Made in Taiwan.
Power Supply/Modulator — Designed in U.K., Made in U.K.
Software — Written in U.K. and U.S.A., Made in Korea and the U.K.
CP/M Plus, CP/M and Dr Logo are trade marks of Digital Research Inc.
AMSTRAD, AMSOFT, AMSDOS, CPC464, and CPC6128 are trademarks
of AMSTRAD Consumer Electronics PLC.
AMSTRAD CONSUMER ELECTRONICS plc.,
Brentwood House, 169 Kings Road,
Brentwood, Essex CM14 4EF.
Telephone: (0277) 228888