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Spectravideo 738 X'Press to MSX-2 upgrade

There are two mainboard models. The earielr (3.2, most popular in Poland) has no space for additional hardware, the other has spare places for extra chips.

128kB VRAM

In version 2.3, desolder both 4416 (IC22, IC25), solder precise sockets and plug the SVI128V board with 128kB DRAM on it. (For test purposes, you can just replace 4416 with 4464.) The /CAS of the second 4464 pair should be connected to pin 60 of VDP (IC37).

In newer board replace 4416 memory with 4464 and add next two 4464 in spare space.

Z80 CPU @ 6MHz

To be continued...

MSX2+ ROM

To be continued...


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Files for download

svi128v.zip 15.5kB (2005-04-13 20:42)
Board for 128kB VRAM upgrade - 4×4464 memories. Board picture and Eagle data files.

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CPC
4MB RAM
Flash ROM
To 128
Sam Coupé
SAM512
Portfix
YABUS.Z80RTC
Z80JOY
MSX
Mapper 4MB
MSX-2 SVI738
Spectrum
FlashD0
8251
AY
Eniac'owe
Dock
Gama 192
Keyboard
ROM replacer
SamRam
TC2144
To 128K
To +3
Wonder RAM
Z80JOY
ZX 4MB
ZXMUX
Timex
Memory
Timex FDD
YABUS.TF
YABUS.TF3
TI-of-TTL
ZX81
Memory

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© 2009-12-28 21:50 Jarek Adamski, http://8bit.yarek.pl