Any discussions related to the creation of new hardware or software for the ZX80 or ZX81
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Post by gammaray » Mon Dec 04, 2017 3:39 pm

That is true.
Once you have ZXPand with RAM built in the case there is no way to add UDG externaly.
That speaks against internal ZXPand (or add internal UDG as well)
Kind regards Paul
Now I may be really running out of room! Must give pause...
Finish what you start. Truth is over the mountaintop or six feet under.
4 x TS1000, 2 x TS1500 , 2 x timex 2040 printer, 1/2 x timex 2020 cassette deck, ZXPAND+AY, ZeddyNET, ZXBlast..., unfinished Spectrum...Still no life!

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Post by siggi » Mon Dec 04, 2017 8:43 pm

If memory (ZXPand) is inside the case: don't forget to allow disabling that internal memory from outside (via signal /RAMCS). Otherwise it would not be possible to add external ram, e.g. the Chroma81 interface ...

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