test-drb November 2009

test-drb@ccmp.vtda.org

175 participants
194 discussions

by witchy＠binarydinosaurs.co.uk

Folks, Some 'artists' are mental. Discuss. Item 150382954132 -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?

16 years

RGB-to-VGA adapter & docs was: Re: HP "Field Guide" ?

by tanderberg_99＠yahoo.com

Hello Eric: I have been looking for RGB (BNC) to VGA converter. I also found Magenta Research is selling one at $695. I have an old IBM RS6000 computer which used a fixed frequency monitor with BNC RGB input. I would like to connect a modern PC monitor. Would you think your circuit works for my case? If so, could you send me the circuit? Thank you Chungduck Ko

16 years

Motorola EXORset

by lynchaj＠yahoo.com

http://classiccmp.org/pipermail/cctalk/2009-November/278609.html Motorola EXORset Henk Gooijen henk.gooijen at hotmail.com <mailto:cctalk%40classiccmp.org?Subject=Re%3A%20Motorola%20EXORset&In-Reply- To=%3CBAY128-DS3AEB02DB68B6D8DA8B2BB86A50%40phx.gbl%3E> Mon Nov 16 10:04:35 CST 2009 * Previous message: Motorola <http://classiccmp.org/pipermail/cctalk/2009-November/278599.html> EXORset * Next message: IC <http://classiccmp.org/pipermail/cctalk/2009-November/278600.html> DEC8881 * Messages sorted by: [ <http://classiccmp.org/pipermail/cctalk/2009-November/date.html#278609> date ] [ <http://classiccmp.org/pipermail/cctalk/2009-November/thread.html#278609> thread ] [ <http://classiccmp.org/pipermail/cctalk/2009-November/subject.html#278609> subject ] [ <http://classiccmp.org/pipermail/cctalk/2009-November/author.html#278609> author ] _____ From: "Andrew Lynch" <lynchaj at yahoo.com <http://www.classiccmp.org/mailman/listinfo/cctalk> > Sent: Sunday, November 15, 2009 10:40 PM To: <cctalk at classiccmp.org <http://www.classiccmp.org/mailman/listinfo/cctalk> > Subject: Motorola EXORset > Hi! Does anyone have the schematics for the Motorola EXORset? If so, > would > you please either make a scan or look something up for me? > > I would like to know how the MC6840 PTM interfaces with the MC6809 CPU. > > Thanks and have a nice day! > > Andrew Lynch It is fairly straight forward, as with all 68xx chips. The databus goes to ... the databus. The E clock input connects to the E (sometimes called phi2) of the 6809. The RSx pins go to address lines, depending on your decoding scheme. The normal method is RS0 to A0, RS1 to A1 and RS2 to A2. R/W* goes directly to the R/W* pin of the CPU. CS0* and CS1 go to address decode logic. The chip is selected when CS0* = "0" and CS1 = "1". If you want to use interrupts you must tie the IRQ output of the PTM to the IRQ input of the CPU. As several peripheral devices can be connected to the IRQ pin of the CPU, they are all open collector. So somewhere the IRQ line must have a pull-up resistor. - Henk. ----- REPLY FOLLOWS ----- Hi Henk! Thanks for the help! What I am trying to do is build an IO mezzanine board for the N8VEM 6809 host processor board. I currently have a 6809 host processor board with a 6809 CPU, RAM, ROM, and a 6821 PIA to 8255 PPI "bus bridge" to the ECB. The device appears on the ECB as a peripheral to the Z80 "bus controller". What I am building is an IO mezzanine board for the 6809 host processor which will plug in on top of the 6809 host processor and provide some IO devices. Currently, it supports the 6551 ACIA (working), 6840 PTM (working), and a pair of 6522 VIAs (not installed yet). The ACIA is working since I can communicate with the 6809 host processor and IO mezzanine board using my crude monitor (minibug). I've written a small program to make the output of timer #3 make a square wave so I am pretty sure the PTM is working as well. My major goal of the IO mezzanine board project is to be able to run the Motorola ASSIST09 debug monitor to include the hardware single step mode. The PTM is interfaced to the CPU in the usual way however, the output of timer #1 is also connected to the /NMI line of the CPU. I am since the CPU /NMI is active low and the output of PTM timer #1 is active high (I think), I am running the signal through an inverter. That's why I am asking about the Motorola EXORset because I believe the ASSIST09 was released to support that hardware and I would like to check my design with it. If you or anyone else has any information on the hardware ASSIST09 was originally written to run on please let me know. Thanks in advance and have a nice day! Andrew Lynch PS, I just got the ACIA code (sort of) working in the ASSIST09 monitor. There is still some sort of bug as the input handling is rather screwy but I can get some things to work.

16 years

Pics of the industrial PDP stuff + unknown ones

by ethan.dicks＠gmail.com

On 11/16/09, John A. Dundas III <dundas at caltech.edu> wrote: > At 10:13 AM -0500 11/16/09, Ethan Dicks wrote: >>I am unfamiliar with the ACT name, but that's my opinion based on the >>board shape and chips present. > > ACT = Able Computer Technology, Able's formal name. Ah... well then... It's a very good chance it's this... http://www.able.com/qniverter.html -ethan

16 years

Intel 4004 complete schematics and simulator available

by dzubint＠vcn.bc.ca

(I just saw this as a story on Slashdot) The 4004 Schematics, Artwork, and Simulator at: http://www.4004.com/mcs4-masks-schematics-sim.html ----------- Thomas Dzubin

16 years

#2 Fw: RGB-to-VGA adapter & docs was: Re: HP "Field Guide" ?

by tanderberg_99＠yahoo.com

I did not tell you video card info. H freq = 63.35khZ and V = 60Hz fixed frequency. Thank you Chungduck Ko --- On Mon, 11/16/09, ck <tanderberg_99 at yahoo.com> wrote: > From: ck <tanderberg_99 at yahoo.com> > Subject: RGB-to-VGA adapter & docs was: Re: HP "Field Guide" ? > To: > Date: Monday, November 16, 2009, 12:03 PM > Hello Eric: > > I have been looking for RGB (BNC) to VGA converter.? I > also found Magenta Research is selling one at $695. I have > an old IBM RS6000 computer which used a fixed frequency > monitor with BNC RGB input. I would like to connect a modern > PC monitor. > > Would you think your circuit works for my case? If so, > could you send me the circuit? > Thank you > Chungduck Ko > > > > ? ? ? >

16 years

Motorola EXORset

by lynchaj＠yahoo.com

Hi! Does anyone have the schematics for the Motorola EXORset? If so, would you please either make a scan or look something up for me? I would like to know how the MC6840 PTM interfaces with the MC6809 CPU. Thanks and have a nice day! Andrew Lynch

16 years

Industrial PDP boards available

by quapla＠xs4all.nl

I have available a number of what looks like industrial PDP-11 stuff. These board do have a grey handle and are marked 'BH-xxx' instead of 'Mxxxx'. Several boards, single, dual, quad & hex ones. And also a backplane. If interested, let me know off list. Ed -- Certified : VCP 3.x, SCSI 3.x SCSA S10, SCNA S10

16 years

Parts bonanza

by snhirsch＠gmail.com

Anyone within driving distance of Windsor, VT might want to get in touch with Brad Thompson at WinCycle: wincycle at wincycle.org They are nominally a computer recycler who handle the usual castoffs, dead notebooks, off-lease PCs, etc, etc. Recently, a local landlord gave them the entire parts inventory of a local manufacturing company who went bankrupt and abandoned it. They made the entire thing available to local hams and hobbyists for free (or a small donation if you really felt guilty). We went down with a couple of storage tubs and filled them to the brim with tubes of unused 74-series and CD-series logic, machine-pin sockets and more resistors and caps than you could even imagine. All of this is pre-surface-mount through-hole componentry. An entire afternoon's picking didn't really make a visible dent - there's that much stuff. I would estimate many hundreds of tubes of chips and sockets and tens of thousands of caps, resistors and other small parts. I would suspect we were looking at > $100,000 worth of components at original cost. When we left, he mentioned that they might do this again next Saturday. At some point, I'm sure they will sell whatever remains to an industrial auctioneer or serious flea-marketer. So if interested, I would suggest moving quickly. Steve --

16 years, 1 month

Shipping a Tek 'scope

by jules.richardson99＠gmail.com

I'm not reading here much at present, not until I eventually get all my collection moved, but I did just get offered a Tek 545A which is languishing in a garage down in Texas, so figured I'd ask about shipping it safely. Weight seems to be 65lbs according to the manual, but I've not poked any shipping companies yet to see how much it'll cost to get it up here to MN - perhaps it'll end up being just too costly on those grounds. Current owner's happy to pack it for me and drop it off to a shipping company (and apparently they have a Craters and Freighters about 5 miles away from them). Obviously styrofoam "poodle poop" is not a good idea - presumably a higher-density material of some kind would be good, and something that's not going to shift around too much. I wondered about some slabs of that styrofoam stuff they use as house insulation, cut to fit, but maybe that's *too* solid and won't absorb any impacts. Oh, and obviously something softer would be needed on an inner layer to protect all the controls at the front of the 'scope... Do people recommend pulling the tubes/valves and packing and shipping separately, or will they likely be OK in-situ? I'd be doing a strip-down of it anyway (it's not run in a couple of decades) - but with over 100 of them it's a lot of work for the current owner, plus I hate getting stuff already-dismantled and prefer making notes as I disassemble it myself. cheers Jules

16 years, 1 month

← Newer
1
...
10
11
12
13
14
15
16
...
20
Older →

Jump to page:

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb November 2009