Mainboard Versions

CPC464 version 1 (original)

• Board: PT NO Z70100, without any "MCnnnn" code, Copyright 1983
• Original version. Big mainboard, old Gate Array (with cooling plate). Real wires going to keyboard.

• Board: PT NO Z70100, MC0001A, Copyright 1983
• Keyboard connector now has two rows of soldering points (maybe intended to allow to use different connectors)

• Board: PT NO 270100, MC0001A, Copyright 1983
• This one is labelled 270100, not Z70100.

CPC464 version 2 (new gate array)

• Separate soldering points for old and new Gate Array (with changed pin-outs).
• New connector for fragile membrane keyboards (still has optional soldering points for fitting the old more robust keyboard).

• Board: PT NO Z70200, MC0002D, Copyright 1984

CPC464 version 3 (medium-sized)

• Medium sized mainboard. Same components as previous version, except that they are arranged more tightly. Joystick/stereo moved to left edge of board.
• Can be optionally fitted with Amphenol connectors (instead of Edge connectors). The srew-holes have contacts for optional shielding-plate.

• Board: PT NO Z70374, MC0044A

• Board: PT NO Z70375, MC0044D
• Mostly same as MC0044A. The 3 resistors in upper-right are arranged differently, different cassette connector installed, different GND fields.

CPC464 version 4 (cost-down)

• Board: PT NO Z80329, MC0099A, Copyright 1988
• Tiny mainboard. Uses 100pin SMD Gate Array (combines the old Gate Array, CRTC, and some FDC/DRAM/RESET logic in one chip).

CPC664

• Board: PT NO Z70205, MC0005A
• 8pin FDC Data Separator

• Board: PT NO Z70205, MC0005B
• Another 664 version, found in german Schneider CPCs (but might be also used in other countries?)
• This board version typically includes a small patch: A resistor soldered between Pin9 (A0) and Pin14 (/CASADDR) of IC105. The patch is also seen here. The resistor is labeled as R160 in the schematic, but isn't labeled on the PCB, so it was apparently added after designing the PCB.

CPC6128 version 1 (8pin data separator, solder points for old and new gate array)

• Board: PT NO Z70210, MC0009A
• Separate soldering points for old and new Gate Array (as far as known, the old Gate Array was never used in 6128 though, only in 464).
• 8pin FDC Data Separator.
• Can be fitted with Amphenol connectors (as used in german cpcs) (instead of edge connectors).

CPC6128 version 2 (24pin data separator, solder points for new gate array only)

• Board: PT NO Z70290, MC0020B, R1706-94HB, Copyright 1985
• Can be fitted with Amphenol connectors (done in germany) (instead Edge connectors).
• Uses 24pin FDC Data Separator.
• Here's also another picture.

• Board: PT NO Z70290, MC0020I, 94V.0-FR-4, Copyright 1985

• Board: PT NO Z70290, MC0023D, 94HB-R1706, Copyright 1985
• Sold in germany, with Amphenol connectors (and dummy edge-connectors which don't have any contacts, and which are covered by green solder-stop layer), front of mainboard has several vias for giving better contact to shielding plate).
• Note: The board does exists: I do have a CPC with that board, but I've modified it, and putting pictures of modded boards here would look a bit confusing. Does somebody have an unmodded board? --Nocash 23:36, 9 April 2010 (UTC)

• Board: PT NO Z70290, MC...?, 94...?
• Looks almost like the above german board, but the "94HB-R1706" is different
• http://www.1000bit.it/scheda.asp?id=30 (not perfect picture quality; and board numbers are hidden under shielding plate and capacitors)

CPC6128 version 3 (cost-down)

• Board: PT NO Z80330 (1988)
• Uses 100pin SMD Gate Array (combines the old Gate Array and PAL, CRTC, and some FDC/DRAM/RESET logic in one chip).
• Can be fitted with four 64Kx4 RAM chips (or the normal sixteen 64Kx1 RAM chips)
• Printer port consists of 74LS174+74LS175 (instead of 74LS273)

CPC6128 version 1.5 (does it exist...?)

• Board: PT NO Z70250
• Not sure if this version exists, maybe somebody just misread or mistyped the Z70290 board number (?)

CPC 464+

• Board: 2700-016P-3, MC0122D, Copyright 1990
• Same mainboard is used in 464+ and 664+ (though not all components installed in 464+, and with different LK Links. Uses 160pin SMD Gate Array (ASIC).

CPC 6128+

• Board: 2700-016P-3, MC0122D, Copyright 1990
• Same mainboard is used in 464+, but with additional components installed (extra RAM chips, FDC chips, Floppy connector, and with different LK Links).
• Uses 160pin SMD Gate Array (ASIC).

• Board: 2700-016P-3, MC0122B, Copyright 1990
• Another version, MC0122B, is shown in the Service Manuals (Plus series, page 5).

• Board: 2700-016P-3, MC0122A, Copyright 1990
• Yet another version, MC0122A, is shown in the Service Manuals (Plus series, page 16).

GX4000

• Board: 2700-017P-4, MC0123C, Copyright 1990
• Same chipset as CPC+, but lacks Keyboard, Expansion Port, Printer Port, Tape/Disc Interfaces.
• Additional Scart Connector and TV Modulator.

• Board: 27...?, MC...?, Copyright 1990
• Version without TV Modulator installed, and with IC101 replaced by 4 transistors.
• See this picture (might be same mainboard as above, not sure - the photo doesn't show the boards part number; hidden behind the cartridge slot, one thing that IS different is the K1 vs K3 text near the LED).

• Board: 2700-017P-3, MC0123A, Copyright 1990
• Shown in Service Manuals (Plus series, page 24 and page 32/france).

System Cartridge (BIOS of CPC+)

• Board: PT-NO-Z90903-MC0121A
• With custom LKs, and double-sided soldering points.

• Board: PT-NO-Z90903-MS0201A
• With custom LKs, and single-sided soldering points.

• Board: 2700-023P-1
• With hardwired LK1 and LK6, and single-sided soldering points.

DDI-1

• Board: MF0004B, ISS3
• 20pin FDC Data Separator

• Photo of the above Board: MF0004B, ISS3 (and maybe other ISSues, if any?)

Clones

• KC Compact
• East german CPC clone

• Board: PATISONIC ALESTE 520EX 01.003
• Russian CPC clone

See also

• Amstrad part numbers - Part Numbers for PCBs and Chips
• Schematics
• Service Manuals - (cost-down 6128 is in the Amendment manual)

Forum

• http://cpcwiki.eu/forum/index.php/topic,678.0.html - CPC Mainboard Versions related