ZX81 kits (was Re: Keep or assemble???)

From: Glen Goodwin <acme_ent_at_bellsouth.net>
Date: Thu Sep 27 23:42:46 2001

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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Received on Thu Sep 27 2001 - 23:42:46 BST