Przelotowe będzie. To tylko prototyp. Ale jednak ja nie kupuję. Nie daje drugiego video-ramu, a kompatybilność jest stosunkowo niska - gry pójdą. Ale to tyle.
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1) Could you specify if there will be a version that - connected to 16K ZX-bus - will give me full compatibility with Spectrum 128K software, without any additional internal modifications?
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External upgrade to ZX128 compatible memory is enable, but compatibility is about 85-90%. This interface can be connect to ZX16 without internal modifications ! Enable ZX128kB compatible memory but videoram switching is impossible, always shou only first videoram.
2) In what speed will it work? ZX16, ZX128 or Pentagon? (Timing and stuff)?
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Timing is 100% same as on ZX48. Code in all 128kB ram pages work at full speed 3.5MHz (as ram 32768-65535 on ZX48.
3) Will it be through/out/in device? I can see only one ZX-bus. I would look for something that is "ready to use" instantly, without wondering about additional interfaces. If possible.
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Yes, this is only prototype. Through ZX bus can be add on back side.
4) Will the gigasceen work? I mean - does it also provides 2 video-rams (necessary for full 128K compatibility)?
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no, only first videoram are used.
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Will exist one version of board, but more variants of used components (more configurations):
a) upgrade to ZX128 memory = 28 EUR
b) upgrade to ZX128/Pentagon 512 memory = 33 EUR
c) upgrade to ZX128/Pentagon 512/Pentagon 1024kB memory = 40 EUR
Different configurations need different firmware for GAL chip.
Next configurations:
d) upgrade to ZX128 memory + 32kB rom = 35 EUR
e) upgrade to ZX128/Pentagon 512 memory + 32kB rom = 39 EUR