Date   : Sun, 28 Dec 2008 17:09:12 +0000
From   : zeem.uk@... (Alex Taylor)
Subject: OT: ZX80 ROM ?

2008/12/28 Jules Richardson <jules.richardson99@...>:

> I think the key mappings get a little changed around in doing that, though.
> ISTR I've got both ZX80 and ZX81 ROMs for my machine, but also have a
> ZX81-style keyboard template which fits over the top of the original ZX80 one
> for use with the ZX81 ROM.

Yes, the ZX80 uses a 4K integer BASIC written by John Grant of Nine
Tiles Networks in Cambridge. The ZX81's 8K floating-point BASIC (which
also works in the ZX80, only without the SLOW mode) was written almost
from scratch by Nine Tiles' Stephen Vickers, who later went on to
write the Spectrum's 16K ROM using the ZX81's as a basis.

The official upgrade consisted of a ROM, ZX81 manual (which Vickers
also wrote) and the keyboard overlay you mention.


-- 
Alex Taylor