21 Apr
2000
21 Apr
'00
6:38 p.m.
Hi All,
Mike paid a visit from Jacksonville today and we had a llloonnggg day of
digging for computer relics. Mike found a Grid laptop and a NIB Grid MODEM.
I found a 1801A CPU! This is the predecessor to the COSMAC 1802. I never
expected to see one of these. I also found a HP 45 calculator, a HP 9816
computer, a pair of HP 9121 disk drives and a National Semiconductor RM-665
computer. The NS computer uses MultiBus cards and has an Intel 80/20 CPU
card with a 8080 CPU. It also has Analog Devices card with several D-A and
A-D devices on it. I've never heard of a National Semiconductor computer
before. Does anyone know anything about them? Mike also got a Motorola
HDS-200 Hardware Developement system with the plug ins for a 6502 CPU. Does
anyone have any information about these?
Joe
21 Apr
21 Apr
8:12 p.m.
On Fri, 21 Apr 2000, Joe wrote:
The NS computer uses MultiBus cards and has an Intel
80/20 CPU card
with a 8080 CPU. It also has Analog Devices card with several D-A and
A-D devices on it. I've never heard of a National Semiconductor
computer before. Does anyone know anything about them?
NS was a second source for the 8080. I've got one of their SBC clones
somewhere (I think it's an 80/10 clone).
Cheers,
Doug
22 Apr
22 Apr
3:57 a.m.
Doug,
Are you back on the list now?
The card in this one in an Intel card but I'll take a closer look and
see who made the CPU.
Joe
At 01:12 AM 4/22/00 -0400, you wrote:
On Fri, 21 Apr 2000, Joe wrote:
The NS computer uses MultiBus cards and has an
Intel 80/20 CPU card
with a 8080 CPU. It also has Analog Devices card with several D-A and
A-D devices on it. I've never heard of a National Semiconductor
computer before. Does anyone know anything about them?
NS was a second source for the 8080. I've got one of their SBC clones
somewhere (I think it's an 80/10 clone).
Cheers,
Doug
21 Apr
21 Apr
8:48 p.m.
New subject: Interesting finds; 1801, National Semiconductor RM-665, Grid,HPs..
I doubt that Motorla made a development system for the 6502. MOS technology
was stealing LOTS of their business, and they'd certainly not support a
competitor's products.
National Semiconductor built lots of 8080 stuff, including the processor
once the market took off. I have several cardcages (4-slots) that bear the
National logo. They are Multibus-1, of course.
If I were you, Joe, I'd hang onto the iSBC 8020 boards. I've used them and
their successor, the iSBC 8020-4 (4 MHz CPU) and its 8085 incarnation, the
iSBC-8024 MANY times, for things that could use the on-board peripherals.
The normal complement of memory ws only 2K, though I've never seen a board
from this series that didn't have 4K in the form of
8 2114's. They're
extremely useful and quite straightforward once you learn
where everything
is. You don't have to use them with other Multibus boards, but it's
certainly possible.
One of these days I'll put the ol' 8024 together with a RAM board and the
Central Data FDC, and it will boot CP/M.
I've got quite a number of Multibus-1 boards, of which more than half are
802x boards.
Dick
----- Original Message -----
From: Joe <rigdonj(a)intellistar.net>
To: <classiccmp(a)classiccmp.org>
Sent: Friday, April 21, 2000 9:38 PM
Subject: Interesting finds; 1801, National Semiconductor RM-665, Grid,HPs..
Hi All,
Mike paid a visit from Jacksonville today and we had a llloonnggg day
of
digging for computer relics. Mike found a Grid laptop
and a NIB Grid
MODEM.
<snip>
HDS-200 Hardware Developement system with the plug ins
for a 6502 CPU.
Does
anyone have any information about these?
Joe
22 Apr
22 Apr
12:13 a.m.
New subject: Floppy storage boxes
I found something I have been looking a long time for, floppy storage
boxes. These are the corrugated units that fold into a drawer and box tube
that the drawer slides into, and that can be stacked several high. I bought
a case each of 5.25 inch and double drawer 3.25 inch, so if anybody else is
looking for this type of storage, email me and I will share some of what I
have.
5.25" CD/Diskette Storage Drawer Stores 32 CDs or 150 Diskettes
Dimensions: 6*"W x 6*"H x 14*"D
3.5" Diskette Storage Drawer Stores up to 175 Diskettes
Dimensions: 8*"W x 4*"H x 14*"D
12:44 a.m.
New subject: Interesting finds; 1801, National Semiconductor RM-665, Grid,HPs..
----- Original Message -----
From: Joe <rigdonj(a)intellistar.net>
To: <classiccmp(a)classiccmp.org>
computer, a pair of HP 9121 disk drives and a National
Semiconductor RM-665
computer. The NS computer uses MultiBus cards and has an Intel 80/20 CPU
card with a 8080 CPU. It also has Analog Devices card with several D-A and
A-D devices on it. I've never heard of a National Semiconductor computer
before. Does anyone know anything about them?
National Semiconductor was a 8080 secondsource outlet for quite a while.
(~1975-1980) So it stand to reason that they also supplied development
systems for it. I also recall them selling I/O and memory boards for the
multibus
Sipke
2:10 p.m.
Joe wrote:
I found a 1801A CPU! This is the predecessor to the
COSMAC 1802. I never
Cool, could you put a photo on your web site?
A few years ago in a surplus store I found the RCA CMOS databook that
contained (sketchy) specs for the 1801. However, the idiots were not
willing to accept an offer of $5 each for various data books I wanted,
apparently believing them to be more valuable. (I would have understood
if they had been trying to keep a reference library, but they claimed to
be trying to sell them.)
The databook indicated that the 1801 is a two-chip set, which consists of
the CDP1801C and CDP1801R, the former containing the control circuitry and
that latter containing the registers. Apparently RCA designed it as a
production prototype, and did not intend it for commercial use, instead
recommending that customers design in the 1802 which was due out soon
thereafter.
8858
days inactive
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6 comments
6 participants
participants (6)
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doug＠blinkenlights.com -
edick＠idcomm.com -
eric＠brouhaha.com -
mikeford＠socal.rr.com -
rigdonj＠intellistar.net -
sipke＠wxs.nl