Hi all
> >
> >
> > The second is an Apple-labeled 12k ROM card with part number 960-9104. It
> > has six sockets and appears to be ORGed at $D000. There's a jumper labeled
> > "2716" and a small red toggle switch. Maybe it can program EPROMS? Five of
> > the six slots are filled with Apple ROMs - the D8 ROM is missing.
>
>My guess would be this is the AppleSoft ROM card. It goes in slot 0
>(IIRC) on a machine with Integer BASIC on the motherboard. The switch
>selects between AppleSoft and Integer BASICs.
http://www.retro.co.za/ccc/apple2/apromcrd.jpg ?
W
Hi,
Does anyone know what the available bandwidth of "standard"
parallel ports might be? E.g., on PC's I believe bus speed
is emulated at 8MHz (?) for I/O instructions (legacy). But,
what about other machines with parallel (printer) ports?
Thx,
--don
> From: "Chuck Guzis" <cclist at sydex.com>
>
> Actually, it's pretty amazing how an 8088 at 8MHz is entirely usable under
> DOS (or CP/M-86).
>
> Does anyone know if MS Network can be run on an XT or does it have
> 286-specific code? I can't recall.
>
>
On review, looks like I missed the intent of your actual question, Chuck...
IIRC, the mid-80's IBM's PC Lan and MS's LAN Manager both ran on 8088's using DOS 3.3 and above and NETBIOS. I don't believe that a 286 was required.
Jared
Hi, all:
I've got a DEC PDP-8/I with the typical current-loop TTY interface. I also
have an ASR-33 teletype. The teletype, though, isn't a DEC-modified
version; it's got a Data General card in it instead of the 4915 card DEC
installed in their teletypes.
I'm Data General ignorant, I'm afraid. :/ So here's my questions:
-Do your typical Data General systems use a 20ma current-loop to talk with
ASR-33s?
-What's the pinout for DG/Teletype connections? Is it something that can
be made DEC-friendly by simply wiring a different connector to the DG
TTY's cables, or are the differences in signals more extensive?
-If the solution isn't that simple, does somebody have a 4915 card they
wanted to part with (or a schematic of one) (or a DEC-outfitted ASR33 they
wanted to trade for a DG-outfitted ASR33 <g>)?
Any help appreciated. Thanks!
-O.-
Hello,
I have a Zenith version of the Heathkit 89. Inshipping the tube fell back and pulled some wires out of the board. Can you help? I need eith a photo or a description of where they go. The wires in question plug straight into the back of the tube. That part is fine. I need to know where they go on the board. There are 2 browns (still fastened) 1 yellow(fastened) green, black, red and white (unfastened) The places where they come out of the bard are labeled G1,G2,G,G4 but I don't know which wire went to wich board location.
Your assistance would be appreciated.
thanks, Charlie
> Anyone know anything about the MLP-900 from Standard Computer Corporation?
There may be some things at CHM from Gordon's archives.
It is doubtful one has survived. The only surviving QM-1 I know of is in
Canada.
So, has anyone ever heard of a MENTEC SBC-100? I just acquired a pair of
DEC-clone boxes, each has a Mentec board, which has screen printed on it "SBC
100-04" and a label that says "SBC 104B" on it.
The board is a quad-height QBUS module, with a J11 chip, 4x 10-pin headers for
serial ports, and 4MB (2MW) of ram soldered onboard. There's also a 8-pin DIP
on the board labelled "19.660M" which I'm guessing is a 19.660MHz oscillator,
a 16-switch dip switch, and a pair of 27C128 EPROMs that are
labelled "R10-70A (C) 1991 MENTEC", and R10-71A.
Pat
--
Purdue University ITAP/RCAC --- http://www.rcac.purdue.edu/
The Computer Refuge --- http://computer-refuge.org
While not strictly OT, I figure if any crowd would know an answer to this,
this one would. I'm building some electronic toys that need a retro look.
I'm looking for some toggle switches (SPST) with long paddle handles, very
old school. All I can find in the regular catalogs have anemic small
paddles. Any pointers?
Ken
After over two years, I have finally completed converting scanned docs
for my BASICON MC-1N from JPEG (!) to ASCII and put up a small page
describing this somewhat obscure INS8073-based microcontroller. The
docs (posted _with_ permission) will probably be interesting to anyone
who is looking for information on the INS8073. There is, naturally, a
lot of material that relates specifically to the MC-1N and its memory
map and its on-board peripherals (an 8255 PPI and an MM58174A
clock/calendar), but the bulk of the manual is about NSC Tiny BASIC.
One of the motivations for finishing the docs was to better understand
the RB5X (INS8073 w/*3* 8255 PPIs and 8K of SRAM). The memory map may
be different, but that's trivial to transpose.
http://www.penguincentral.com/retrocomputing/INS8073/
If anyone has any questions, stories, ideas, etc., for INS8073
projects, I'm interested, on-list or off-list.
-ethan
