27 Sep
2001
27 Sep
'01
4:42 p.m.
Tony Duell wrote:
Yes, but hang on a second. If I don't keep the
BASIC (I'd prefer Forth,
and yes I know there was a forth ROM for the ZX81), I modify the display
(so I don't really use the ULA)
The ULA does a lot more than handle the display ;>)
I replace the keyboard, and upgrade the
internal RAM, then all I am really using is the Z80. And those are not
hard to find :-)..
Okay, you are absolutely correct given the FORTH. I use calls to the BASIC
ROM routines from assembly and machine code, so I'm using more than just
the Z80 MPU.
In other words, if I'm going to do that level of
hacking, I might as well
start from scratch. Not that there's anything
wrong in doing that, of
course.
Of course not ;>) But a ZX81 kit is still faster than starting from
scratch.
If I start
with a pre-built unit I have to work around the existing parts.
Or desolder them (which is not impossible, generally).
Try desoldering the RF modulator from a ZX81 board ;>)
Glen
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