FANTASTIC!Moggy wrote: ↑Sun Aug 07, 2022 12:50 pm A 20Mhz ZX81 was made by Andy Rea as a one off experiment, sadly having spoken to Andy he, like Sir Morris, is not likely to be back any time soon but just for reference there is a thread about the device.
It included things such as....
QUOTE
"20Mhz Z80
128K static ram ( split into 8K pages )
the full 64K can be RAM
0-16K is fully pageable
16-48K is always pages 2,3,4,5
48-64K is fully pageable ( but during video pages 2,3 )
turbo (20Mhz)
8-16K ram wrx/udg switchable
m1not switchable
ZxPand-a-like (very very alike Thanks SirMorris) possible to page zxpand rom (once loaded to ram by special boot program) in and out
erm think thats about it... oh runs Sponzy slightly faster than original 48K spectrum !..."
Details can be found here.
viewtopic.php?f=6&t=961
Youtube video.
https://www.youtube.com/watch?v=ba8_jqBDSkU
A proposal. Just an idea.
Re: A proposal. Just an idea.
-sanello