6502 chip

[Stowe, Ted-SEA]

just to show my age, I've built a lot of z-80 stuff, but today I see z-80
computers, in the form of 'kaypros' in flea markets and thrift stores for
5-8 dollars, that type of thing. maybe 10, usually they work. 

they were a mod of something called 'the big board' which was a z-80 system
with 64kb of ram. the monitor code for the big board was very standard and
was published, and works fine in a kaypro, it had more or less the whole
z-80 family on that board. might be an inexpensive way to start. and you
probably couldn't buy a switching power supply for that type of money.

you could just lift the whole cpu board right out of it.

-----Original Message-----
From: Don.F.Broadus at ucm.com [mailto:Don.F.Broadus at ucm.com]
Sent: Friday, October 02, 1998 8:21 AM
To: diy_efi at efi332.eng.ohio-state.edu
Subject: RE: 6502 chip


Great Stuff ! I would like to build a Z-80 trainer my self, if you have any
bare bones Z-80 info I would appreciate it.

 
Thanks 
 
Don
	-----Original Message-----
	From:	Terry_Sare at dell.com [SMTP:Terry_Sare at dell.com]
	Sent:	Friday, October 02, 1998 9:10 AM
	To:	diy_efi at efi332.eng.ohio-state.edu
	Subject:	RE: 6502 chip


	If your realllly curious about what computers looked like back then
-- this
	guy designed and build one using ttl.
	http://www.iinet.net.au/~daveb/simplex/simplex.html
	however, note that IC were newfangled critters back in the 60s.
Imagine
	doing this all with transistors and core memory, not with neat
little ICs
	that have it all build in. Somebody posted a NASA page that
described the
	details -- scary what they did. The 6502 is a real supercomputer
compared to
	what they had available. 

	BTW, the 6502 on a AIM65 was the first micro I got to use/program
and was a
	very good processor for its time. You would be surprised to find out
just
	how many 4bit and 8bit micros are still in use for embedded systems.
My
	personal preference is Z80 and CPM.:-)  Simple and easy to use -- at
the
	time.

	Terry Sare