test-drb July 2006

test-drb@ccmp.vtda.org

204 participants
377 discussions

by cctech＠retro.co.za

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

18 years, 4 months

Parallel port bandwidth

by dgy＠DakotaCom.Net

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

18 years, 4 months

MS Network and DOS - was - Source of nifty switches?

by oldcpu＠rogerwilco.org

> 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

18 years, 4 months

Data General/ASR-33 TTY Interface Signals

by ohh＠drizzle.com

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.-

18 years, 4 months

Any former Philips/Magnavox VideoWriter users/owners/hackers?

by suz＠vbe.com

I have a Magnavox VideoWriter. Is there any use for one of these at all? It was my dad's and needs a new home. S Giesen

18 years, 4 months

Heathkit H89 Video Question

by charles.lynch＠ns.sympatico.ca

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

18 years, 4 months

MLP-900

by kossow＠computerhistory.org

> 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.

18 years, 4 months

Mentec PDP-11's

by pat＠computer-refuge.org

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

18 years, 4 months

Source of nifty switches?

by ken＠seefried.com

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

18 years, 4 months

New BASICON MC-1N (INS8073) webpage now online

by ethan.dicks＠gmail.com

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

18 years, 4 months

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test-drb July 2006