ZX01 with tape implementation

[Harbaum]

I have written a cassette tape implementation for the ZX01 (ZX81 in VHDL) so one can upload programs:

http://youtu.be/2_50EPIwVIc

The timing of the ZX01 (either the T80 cpu core or the ZX97) isn't perfect, so many screens refuse to display it correctly.

More infos here
http://code.google.com/p/mist-board/

the zx01 source code incl. the tape is here:
http://code.google.com/p/mist-board/sou ... res/zxgate

It has 16k RAM and even runs Bodos 25thanni although the first two screens have a line-to-line offset of one pixel. And even the standard screen isn't perfect as line 0 and line 32 are 8 pixels wider than the other lines.

But it's working!