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Mamlas_CPLD - how to make ZX SPECTRUM_48 a ZX SPECTRUM_128 compatible computer ?

(almost...i can only presume 95% of games will work)

ZX 48/48+ SRAM / CPU MODULE is my next step to help ZX Spectrum owners to repair their computers home, as in most of the cases faulty is dynamic ram. Also, device adds to Your ZX new CPU, AY chip and generates ULA sound as well

mounted in place of CPU
completly solderless /as long orginal CPU is socketed/
replaces CPU and it`s ram of 32KB
adds 512KB of RAM
CPLD based
AY 3-8910 chip
new Z80 CPU in TQFP44
installation consists of 3 steps:
- remove old rams 32kB
- remove cpu
- insert module into CPU`s socket ( in Timex/ZX48 solder into the motherbard directly)
ULA sound on both channels /generated by device`s CPLD/

USAGE:

during power on hold key "1" - device will set ram size to 128kb from 512 (default)
during power on hold key "2" - device will set AY channels mixing from ABC (default) to ACB

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