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Maplin ZX81 Voice PCB
Posted: Fri May 03, 2019 1:26 pm
by hinotor1
Hi All,
I have a Maplin ZX81 Voice unit for the I'm keen to test with my ZX81. It looks like I will need to build an expansion I/O board as I can't find any available.
Has anyone else built their own DIY I/O board and has any recommendations or advice?
Many thanks!
Re: Maplin ZX81 Voice PCB
Posted: Fri May 03, 2019 3:20 pm
by 1024MAK
This photo shows the Maplin expansion bus type card:
These links should help:
http://k1.spdns.de/Vintage/Sinclair/80/ ... vzx81.html
viewtopic.php?f=7&t=2493
Mark
Re: Maplin ZX81 Voice PCB
Posted: Fri May 03, 2019 4:04 pm
by Moggy
Another alternative is to solder an edge connector onto the board. Also the link provided by Mark for the Maplin board is really important as this board doesn't use the standard allophone codes(0-63 decimal) for the SPO256 chip (a quick glance shows 192 decimal is added to a standard allophone code for this board), some of the standard codes do work for individual ooo's and aas etc but not all, especially in constructed sentences .
SPO256 data sheet for comparison ...
http://spatula-city.org/~im14u2c/sp0256 ... 56-AL2.pdf
An item that may be of interest can be found here....
http://www.schematicsforfree.com/archiv ... sizers.pdf
Re: Maplin ZX81 Voice PCB
Posted: Fri Aug 20, 2021 6:08 am
by XavSnap