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)

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, MC0002C, Copyright 1984 with MS0043A daughterboard (more pictures)
The Spanish CPC472, with nonfunctional 8K RAM on the daughterboard

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.

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.

Board: PT NO Z70378, MC0046A
Additional loops near cassette, monitor, keyboard connectors. Used in german Schneider models (the board on the photo is fitted with spanish rom though).

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).

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.

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 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, 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)
Note: The via in the text makes it easy to misread the part number (it's Z70290, not Z70250).

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)

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)

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).

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).

Same chipset as CPC+, but lacks Keyboard, Expansion Port, Printer Port, Tape/Disc Interfaces.
Additional Scart Connector and TV Modulator.

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).