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Path: utzoo!linus!decvax!harpo!floyd!clyde!ihnp4!ihuxq!covert
From: covert@ihuxq.UUCP (covert)
Newsgroups: net.micro.cpm,net.micro.zx
Subject: Wanted:zx-81 as a controller
Message-ID: <397@ihuxq.UUCP>
Date: Fri, 2-Dec-83 11:16:15 EST
Article-I.D.: ihuxq.397
Posted: Fri Dec  2 11:16:15 1983
Date-Received: Sun, 4-Dec-83 03:31:01 EST
Organization: AT&T Bell Labs, Naperville, Il
Lines: 30

I have an application for a microprocessor based controller and would
like to know some things about the sinclair zx-81:

1)How much RAM,ROM is avialable?

2)Can standard 2732/2716/2764 EPROMS be used in it?

3)How easy is it to interface to??

4)Does it have any real-time interrupts? (I want to implement a soft-ware
clock with it).

5)How is the doc?? Any good books??

6)I plan to write my control program in z-80 assembly, are there any
defined entry points to the io in it??

I had originally planned to buy a STD-buss z-80 card but they
run about $300, and i think that i can get a zx-81 for under $100.
The nice thing about staying with a z-80 based controller is that I
can used my cp/m system to develope the software for it.

Has anyone used a zx-81 as a controller??

If so please respond by mail.

Thanks in advance . 
-- 
			richard covert
			ihnp4!ihuxq!covert