National NSC800 (8085 pinout CPU with Z80 instruction set)

[Lee Hart]

The Z-100 series used the 8085 for its 8-bit CPU. This is fine, but many
people preferred the Z80 in the H89s. The 8085 required a differnt
version of CP/M (CP/M-85) and didn't run H89 programs that needed the Z80.

National Semiconductor made the NSC800, which was a CPU with (almost)
the same pinouts as the 8085, but it had the Z80 instruction set. There
were adapter boards for the Z-100 to allow it to be used in place of the
8085. There was also an article in one of the magazines (Sextant or
REMark) on how to do it. As I recall, there are only two pins that are
different.

In the hopes of someday doing this, I bought some NSC800 stuff "way back
then". Well, I never got around to using them. If anyone is interested,
it's time to sell them. Too many projects, too little time...

I have the National NSC888 Evaluation board, with an NSC800D-2, NSC810D,
a ROM monitor, 1k of RAM (sockets for 4k), and about a dozen other ICs,
all socketed ceramic ICs. It has a large breadboard area, and RS-232
serial port. I also have a new unused NSC800D-2 and NSC810D, also in a
ceramic package. The NSC810 is a CMOS version of the Intel 8155
(RAM/IO/timer). I have the NSC800 databook with specs and application
notes, but can't find the manual itself for the Evaluation board.

How about $100 for the whole shebang? Contract me directly if
interested. I thought I'd give you guys a crack at it first; if no one
is interested, I'll put it on eBay and see what happens.
--
Anyone can make the simple complicated. Creativity is making the
complicated simple. -- Charles Mingus
--
Lee A. Hart http://www.sunrise-ev.com/LeesEVs leea...@earthlink.net