CPC hardware revisions

During the lifetime of the Amstrad CPC there were different hardware revisions. These were made to reduce the cost of manufacturing the machine. All the revisions were based on the same design.

CPC464 revisions

Revision 2

Markings:

Amstrad PTNO. Z70200 ©1984

MC002B

Circuit Reference	Description
IC101	74LS145
IC102	AY-3-8912
IC103	32K ROM; O/S and BASIC
IC104,105	74LS153
IC106	74LS273
IC107	8255 PPI
IC108	6845 CRTC
IC109	74LS153
IC110	74LS132
IC111	Z80A 4Mhz CPU
IC112	74LS32
IC113	74LS153
IC114	74LS373
IC115	74LS244
IC116	40010/40007 Gate-Array (40010 fitted, 40007 not fitted)
IC117-124	4164 RAM
IC125	74HC04
CP001	connector for cassette sub PCB
CP002	connector for keyboard PCB
J101	6-pin DIN socket; video
J102	9-pin socket; joystick
J103	3.5mm stereo socket; sound
J104	2.5mm power line socket; 5v power

Connections:

Side	Order
Top	left to right	Sound, Joystick, printer, expansion, 5v power, monitor
Right	top to bottom	power switch, volume

NOTES:

• This PCB is big and the ICs are not close together.
• This PCB has a space to fit a 40007 and 40010 Gate-Array.
• The keyboard is heavy, has keys that are tall and has wires instead of a ribbon cable to connect it to the main PCB

Revision 3

Markings:

Amstrad PTNO. Z70373

MC004B

Circuit Reference	Description
IC101	74LS145
IC102	AY-3-8912
IC103	32K ROM (O/S and BASIC)
IC104, 105, 109, 113	74LS135
IC106	74LS273
IC107	8255 PPI
IC108	6845 CRTC
IC110	74LS132
IC111	Z80A 4Mhz CPU
IC112	74LS32
IC114	74LS373
IC115	74LS244
IC116	40010 Gate-Array (not fitted)
IC117-124	4164 RAM
IC125	74HC04
IC126	40007 Gate-Array (fitted)
J101	6-pin DIN socket; video
J102	9-pin socket; joystick
J103	3.5mm stereo socket; audio
J104	2.5mm power line socket; 5V power
CP001	connector for cassette sub PCB
CP002,003	connector for keyboard

Connections:

Side	Order
Left	top to bottom	Sound, Joystick
Top	left to right	Printer, 5V power, Monitor, Expansion
Right	top to bottom	power switch, sound volume

NOTES:

• This PCB has a empty space marked for a 40010 Gate-Array
• The PCB is half the size of the other CPC464 PCBs, and uses approx half the space inside the computer keyboard.
• The keyboard has flat keys, and is connected to PCB using a ribbon cable.

Revision 4

Markings:

Amstrad PTNO. Z8032?

MC0099

© 1988

Circuit Reference	Description
IC101	40226 Pre-ASIC
IC102	AY-3-8912 PSG
IC103	8255 PPI
IC104	74LS154
IC105	32K ROM; O/S and BASIC
IC106	Z80A CPU
IC107	74LS174
IC108	74LS175
IC109-116	4164 RAM
IC117,IC118	not used
J101	6-pin DIN socket; video
J102	9-pin socket; joystick
J103	3.5mm stereo socket; audio
J104	2.5mm power line socket; 5V power
CP001	connector for cassette sub PCB
CP002,003	connector for keyboard
CP005	edge connector for printer

Connections:

Side	Order
Left	top to bottom	Sound, Joystick
Top	left to right	Printer, 5V power, Monitor, Expansion
Right	top to bottom	??

NOTES:

• The PCB is about one quarter the size of the older CPC464 PCBs.
• The keyboard has flat keys, and is connected to PCB using a ribbon cable.

CPC6128 revisions

Markings:

Amstrad PTNO: Z70210 ©1985

Furthur details about this PCB are welcome.

CPC6128 revision 1

NOTES:

• This circuit board has a empty space for a 40007 Gate-Array
• The keyboard has flat keys, and is connected to PCB using a ribbon cable.

CPC6128 revision 2

Markings:

Amstrad PTNO. Z70290 © 1985

MC0020B

Circuit Reference	Description
IC101	8255 PPI
IC102	AY-3-8912
IC103	32K ROM; O/S and BASIC
IC104,105, 109, 113	74LS153
IC108	6845 CRTC
IC111	Z80A 4Mhz CPU
IC114	74LS373
IC115	74LS244
IC116	40010 Gate-Array
IC117	74HC04
IC118	16L8 Ram configuration PAL
IC119-135	4164 RAM
IC201	765A FDC
IC202	SED9420
IC203	74HC240
IC204	16K ROM (DOS)
IC205	74LS08
IC206	74LS38
IC207	74LS32
IC208	74LS38
IC209	74LS136
IC210	74LS32
IC211	74LS136
IC212	74LS74
J101	6-pin DIN socket; video
J102	9-pin socket; joystick
J103	3.5mm stereo socket; sound
J301	5V power (keyboard)
J306	5-pin DIN socket; cassette

Connections:

Side	Order
Left	top to bottom	Cassette, Joystick, Sound
Top	left to right	Printer, Expansion, 12V power, 5V power, Monitor,2nd disc drive, power switch, volume

NOTES:

• The keyboard has flat keys, and is connected to PCB using a ribbon cable.

CPC6128 revision 3 - the "cost-down"

Markings on PCB:

Amstrad. PTNO. Z80330 1988 ©

MC0100A

Circuit Reference	Description
IC101	40235 Pre-ASIC
IC102	8255 PPI
IC103	AY-3-8912
IC104	74LS145
IC105	Z80A 4Mhz CPU
IC106	74LS273?
IC107	74LS??
IC108	32K ROM; O/S and BASIC
IC109-IC125	4164 RAM
IC126-IC129	unknown; not fitted
IC201	765A FDC
IC202, 203	74LS38
IC204	74HC74?
IC205	16K ROM; DOS
IC206	SED9420
IC301	??
IC302	??
CP001	Printer connector (not fitted)
CP002	Expansion connector (not fitted)
CP003	2nd disk drive connector (not fitted)
CP101,102	Keyboard connector
CP304	Disc drive power lead
CP305	Keyboard power switch connector
J100	9-pin socket; joystick
J103	3.5mm stereo socket; sound
J201	??
J202	??
J306	5-pin DIN socket; cassette
RY301	cassette motor relay

Connections:

Side	Order
Left	top to bottom	Cassette, Joystick, Sound
Top	left to right	Printer, Expansion, 12V power, 5V power, Monitor,2nd disc drive, power switch, volume

NOTES:

• This circuit board is approx 2/3 the size of the original CPC6128 PCB.
• This circuit board has the Pre-ASIC, the ASIC which proceeds the ASIC in the CPC+
• This CPC was made in Taiwan.
• The keyboard has flat keys, and is connected to PCB using a ribbon cable.