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It has been proved that the decode chip in the Z88 Flash/RAM card is too slow. Existing users who wish to use OZ v4.6 (or later) will need their cards modified with the chip being replaced with this card.
Full 74xx139 Version Build Concept
Tiny url http://tinyurl.com/zf9haly
A new opportunity or a waste of time?
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| 16 pin DIL | 16 pin SO 16 |
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Using the PCB above with pins Z88 Turbo Card fitting pins or wires to connect the PCB 74xx139 Card piggybacked below both footprints may be accommodated.
Build 74xx139 on a 16 pin DIL footprint
This should be possible, 3 chips on each side of the PCB with 2 rows of 8 pins on either side. The PCB will be designed to see if this is possible on a 2 layer board.
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