Mainboard Versions

• Size: 405x155 mm
• Big mainboard, old Gate Array with cooling plate and with VCC2; supplied from VCC via two 12 ohm resistors, R138 and R139, which are seen (with white coating) near the cooling plate.

PCB Top	PCB Bottom	Description
		Board: PT NO Z70100, without any "MCnnnn" code, Copyright 1983 Original version. Real wires going to keyboard.
		Board: PT NO 270100, MC0001A, Copyrigh 1983 Same as "Z70100 MC0001A", but with uncommon text layer: labeled "270100" (not "Z70100"), says "Copyrigh" (not "Copyright"), and, unlike all other boards, its text has slashed zeroes.
		Board: Prototype with Gate Array Simulator (more pictures) The Gate Array Simulator board (mounted on top of the mainboard, and almost having the same size as the mainboard) contains four 8K EPROMs, and a Gate Array prototype made of several logic chips. In later versions these evolved into a normal 28pin 32K ROM chip, and the custom 40pin Gate Array chip.

• Size: 405x152 mm
• Separate soldering points for old and new Gate Array (with changed pin-outs).
• New connector for new 6128-style 2x10pin dual-foil membrane keyboards (still has optional soldering points old 19pin foils).

PCB Top	PCB Bottom	Description
		Board: PT NO Z70200, MC0002B, Copyright 1984 The cooling plate and cooling paste are removed on the photo, revealing the normally hidden 40007-4 gate array chip
		Board: PT NO Z70200, MC0002C, Copyright 1984 Notice that the 472 board below uses other Gate Array model but the board is the same.
		Board: PT NO Z70200, MC0002C, Copyright 1984 with MS0043A daughterboard (more pictures) The Spanish CPC472, with nonfunctional 8K RAM on the daughterboard
		Board: PT NO Z70200, MC0002D, Copyright 1984 another picture.
		Board: PT NO Z70200, MC0008D French board with shielding plates, and additional filtering loops, and french AZERTY rom. Without old 19pin keyboard connector.

• Size: 240x150 or 238x145 mm
• Medium sized mainboard. Same components as previous version, but arranged more tightly. Joystick/stereo moved to left side.
• Can be optionally fitted with Amphenol connectors (instead of Edge connectors, as far as known, this option was never used for the 464). The screw-holes have contacts for optional shielding-plate (this option was used in german Schneider models).

PCB Top	PCB Bottom	Description
		Board: PT NO Z70374, MC0044A
		Board: PT NO Z70374, MC0044B Another picture: Media:CPC464 Z70374 MC0044B cpcmania.jpg
		Board: PT NO Z70375, MC0044D Mostly same as Z70374. The 3 resistors in upper-right are arranged differently, different cassette connector installed, tinned GND fields. Another picture: Media:CPC464 Z70375 Tomdalby.jpg
		Board: PT NO Z70378, MC0046A Additional filtering loops near cassette, monitor, keyboard connectors. Used in german Schneider models. Another picture: Media:CPC464 MC0046A Markus top.jpg
		Shielding as found in german Schneider models

• Size: 237x108 mm

PCB Top	PCB Bottom	Description
		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).

• Size: 475x155 mm

PCB Top	PCB Bottom	Description
		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.

• Size: 320x155 mm

PCB Top	PCB Bottom	Description
		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).
		Board: PT NO Z70210, MC0009A Centronics Version Separate soldering points for old and new Gate Array.
		Board: PT NO Z70210, MC0009C Separate soldering points for old and new Gate Array.
		Board: PT NO Z70210, MC0012A Centronics Version Separate soldering points for old and new Gate Array.
		Board: PT NO Z70210, MC0012B Centronics Version Separate soldering points for old and new Gate Array.

• Size: 320x155 mm

PCB Top	PCB Bottom	Description
		Board: PT NO Z70290, MC0020A, ECMKI-94HB, Copyright 1985
		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, MC0020F, Copyright 1985
		Board: PT NO Z70290, MC0020G, Copyright 1985
		Board: PT NO Z70290, MC0020I, 94V.0-FR-4, Copyright 1985 Here's also another picture.
		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, seen on bottom side), front of mainboard has several vias for giving better contact to shielding plate). Note: The via in the text makes it easy to misread the part number (it's Z70290, not Z70250).
		Board: PT NO Z70290, MC0023G, 94HB-R1706, Copyright 1985 Fitted with Amphenol connectors, and with an english rom.
		Board: PT NO Z70290, MC0026B, 94V0-ECMM1, Copyright 1985 Fitted with Amphenol connectors. It has some weird resistors directly below the video connector, and an extra ferrite ring by the audio jack.
		Board: PT NO Z70290, MC0057A, Copyright 1985 An uncommon version. The cooling plate suggests that this CPC 6128 board would be downgraded for supporting the pin-outs of the old gate array. Most bizarre, the /INT resistor, R144, has white coating, seen at lower-left edge of the cooling plate. On 464 boards similar coating is used on VCC2 resistors. This board was thought to be a joke but we found it in another unit. Here's also another picture.
		Shielding as found in german Schneider models

• Size: 310x145 mm

PCB Top	PCB Bottom	Description
		Board: PT NO Z80330, MC0100A (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) another picture.

• Size: 282x142 mm
• 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).

PCB Top	PCB Bottom	Description
		Board: 2700-016P-3, MC0122B, Copyright 1990 IC16 is 74HCT02 with two extra resistors between pins 2+14 and 3+4 extra diodes near R71-R75 (below right edge of expansion port) (other picture)
		Board: 2700-016P-3, MC0122C, Copyright 1990 IC16 is 74LS27 without extra resistors other extra diodes near R71-R75, and R73 is not installed
		Board: 2700-016P-3, MC0122D, Copyright 1990 New D29/D30 (instead of the "extra" diodes near R71-R75)

• Size: 282x142 mm
• Same mainboard is used in 464+, but with additional components installed (extra RAM chips, FDC chips, internal/external floppy connectors, and with different LK Links).
• Uses 160pin SMD Gate Array (ASIC), and 24pin data separator.

PCB Top	PCB Bottom	Description
		Board: 2700-016P-3, MC0122C, Copyright 1990 (other picture)(other picture)
		Board: 2700-016P-3, MC0122D, Copyright 1990 (other picture)
		Board: 2700-016P-3, MC0122E, Copyright 1990

Other Plus versions are shown in the Service Manuals (Plus series, page 5 = MC0122B, and page 16 = MC0122A).

• Size: 205x150 mm
• Same chipset as CPC+, but lacks Keyboard, Expansion Port, Printer Port, Tape/Disc Interfaces.
• Additional Scart Connector and TV Modulator.

PCB Top	PCB Bottom	Description
		Board: 2700-017P-3, MC0123B, Copyright 1990, K1 R153 installed (near SCART connector) handmade NR2 (between CPU and PSG)
		Board: 2700-017P-4, MC0123C, Copyright 1990, K1 (other picture) R153 not installed (near SCART connector) D135-D142 instead of NR2, R1/R2/C2 rearranged (between CPU and PSG) bigger R181 (3 Watts), C32/D180 rearranged (near RGB monitor connector)
		Board: 2700-017P-4, MC0123C, Copyright 1990, K2 Looks same as above (only the "K2" text near the LED changed). (other picture)
		Board: 2700-017P-4, MC0123C, Copyright 1990, K2 The same board as the above one, but without the modulator.
		Board: 2700-017P-4, MC0123C, Copyright 1990, K4 Looks same as above (only the "K4" text near the LED changed).
		Board: 2700-017P-4, MC0123C, Copyright 1990, K4 The same board as the above one, but without the modulator.
		Board: 27...?, MC...?, Copyright 1990, K3 (without TV modulator) Version without TV Modulator installed, and with IC101 replaced by 4 transistors (used in French models; where the PAL modulator would be useless).

Another GX4000 board (2700-017P-3, MC0123A, Copyright 1990) is shown in Service Manuals (Plus series, page 24 and page 32/france).

• Size: 52x60 mm (more pictures)

PCB Top	PCB Bottom	Description
		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.
		Board: 2700-023P-1 - Fitted with a 27C512 Eprom. Notice the LK3 setting.
		Board: Nonamed - Spanish cartridge without text-layer on PCB (otherwise same as 2700-023P-1).
		Board: AMSTRO1 (LK1-LK6 are called L1-L6 here) - With hardwired LK1 and LK6, and double-sided soldering points.

• Size: 160x65 mm

PCB Top	PCB Bottom	Description
		Board: MF0004B, ISS3, (C) Amstrad 1984 (more pictures) 20pin FDC Data Separator

• The last letter of the PT NO Znnnnn, MCnnnnX board numbers does not seem to indicate a revision (the boards appear to be identical regardless of that letter, as long as the other digits are same). So, the last letter may indicate the manufacturing date or manufacturing location.

• http://cpcwiki.eu/forum/index.php/topic,678.msg9509.html#msg9509 - some more precision values for Mainboard sizes. Add them to this page!

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

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