Amstrad PC - PPC512 and PPC640 Motherboard Option Links

PPC motherboard links

The PPC has seven option links on its motherboard. Some of them have jumper pins already present; others would need the jumpers soldered on to be used.

LK1-LK3: Language

LK1 LK2 LK3 Language for BIOS messages
Off Off Off English
Off Off On German
Off On Off French
Off On On Spanish
On Off Off Danish
On Off On Swedish
On On Off Italian
On On On Diagnostic mode (English messages; most of the power on self test is skipped)

LK4: Memory size

This link has a jumper on three pins. If it is on the left-hand pair of pins, then the memory size is 512k. If it is on the right-hand pair, the memory size is 640k (the extra memory chips must actually be present on the motherboard!)

LK5: Unknown

According to the service manual, this link has three pins: Ground, +5 Volts, and the NDMACS line (which runs between the bus gate array and the DMA controller). The Ground pin is marked "512K" and the +5V pin is marked "640K". Whether this is a setting that varies with memory size, or whether the service manual is in error, I do not know.

LK6,7: Builtin graphics adaptor fonts

The links affect the built-in MDAand CGA fonts.

LK6 LK7 Font
Off Off Normal: Codepage 437
Off On Norwegian: Codepage 865
On Off Portugese: Codepage 860
On On Greek