20-10-2022, 10:39 AM
(19-10-2022, 03:28 PM)Under4Mhz Wrote: Can you tell us more about it? Is it a conversion from the ZX spectrum version? Did you do it? If so, what was involved? Does it need particular hardware to run (teletext, 256tc etc?)
Yes.
Yes.
Someone had to do it.
The CRTC is reconfigured to display 40 columns by 32 rows of 8x8 matrix characters with only 32 columns of 24 rows used for the ZX Spectrum video.
Yes. It requires an Alpha Plus (Premium Series) and above.
Porting ZX Spectrum games should be much easier, perform much quicker and be more efficient with the Microbee Classic Plus.
It is planned to incorporate some of the simple yet powerful features that were omitted from the Alpha Plus production model including:
- Addressing the PCG, CHAR, ATTR & Colour RAM in a contiguous 16K window (to minimise the overhead of Video Memory Bank switching).
- Displaying 8x8 PCGs defined at raster row #8 (increasing PCG efficiency for 8x8 chars from 50% to 100%).