Sinclair ZX Spectrum 128kB
Amstrad ZX Spectrum +2

chip pinout IICMEM is a 8kB memory (EEPROM) connected to the AY-3-8912 chip, that works as I2C controller. Used as a "disk" under ZXVGS to store files.
top and bottom view PL3FIX is a through interface that allows to connect interfaces without a need to make internal changes. It is needed only for Amstrad ZX Spectrum +2A i +2B.
top view to the case TI-of-TTL is a Timex Interface M-397 replacer, build from TTL chips only. Apart from TOS (upgraded to work with ZX128, too) in the extended memory there is ZXVGS and also keyboard test code.
TR-DOS console TR-DOS traps are needed to run TR-DOS software under ZXVGS.
  • TRETRAP - wizardly connected EPROM, has also patches to allow fast loading of "*.TAP" files.
  • TRITRAP - mounted inside.
  • TRXTRAP - external interface.
top board view Z80JOY is the Kempston Joystick interface mounted under Z80 chip. The extension board can be soldered over the Z80 chip. Or the Z80 chip can be desoldered, replaced with a GOLD socket, then interface goes into socket and the Z80 chip into it. As the output can be used one of original joystick slot or extra slot somewhere on the case.
ZXMUX is a small board with SMD logic, that replaces 40-pin multiplekser marked PCF1306P (used in ZX Spectrum 128kB) and marked AMSTRAD 40058 (used in ZX Spectrum +2).
© 2004-04-04 02:15:18 Jarek Adamski zx@yarek·com, http://8bit.yarek.pl