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101090 discussions

by jruschme＠hiway1.exit109.com

A while back I picked up a Mac IIsi which included the adapter for a DayStar accelerator (but no accel.). Given that, I hace a few questions: 1) I notice that there are two ports on the board. One is obviously for the accelerator. What is the other one? A IIsi PDS? 2) Since I don't have a DayStar card, what else (if anything) can I do with the adapter? Can I plug in a IIci cache card? 3) Anybody want to swap it for a Nubus adapter? :-) Thanks in advance... <<<John>>>

27 years, 10 months

Do You Have a PDP-11/03L?

by pete＠dunnington.u-net.com

Hi, Kevin. On Nov 3, 21:46, Kevin McQuiggin wrote: > I have an 11/03L carcass and am hoping to use the backplane for a set of > 11/73 boards I've acquired for a friend. > > I need info on the power supply, hopefully a print set, or in the least > some info on the pinout of the 10 conductor ribbon cable that runs from the > supply to the front panel. My machine has _no_ front panel! The front panel pin numbers match the PSU numbering at the other end, so as long as you can identify pin 1, here are the connections for a real 11/03 panel: 1 BPOK H 2 BEVENT L 3 SRUN L 4 not used/not connected on the front panel 5 GND 6 GND 7 +5V 8 SPARE 9 BHALT L 10 BDCOK H On a real 11/03 panel, SPARE is connected to one end of a 220-ohm resistor; the other end of that resistor is connected to the cathode position of an LED position -- the LED isn't actually fitted -- and the anode of the LED is connected to the +5V line. The other signals are connected to a small circuit containing bus buffers and some inverters to drive 2 LEDs (POWER OK and RUN) and be driven by two toggle-switches (AUX ON grounds the BEVENT line and RUN/HALT is connected via a bus buffer to BHALT L) and a momentary changeover switch (which feeds a pair of monostables to regulate the pulse width, which then drives BDCOK H). > I want to determine which lines are the (presumably) DC OK, HALT, RESTART, > etc, so that I can install the 11/73 gear and control the system. See above. > Secondly, the +12 VDC line from the supply is sitting at 9.5V, no load. > There may be a problem, I can fix it but the print set would be most helpful. Yes, that's definitely a fault, though you should test it under load and look at the BDCOK signal from the PSU. Sorry, I only have diagrams for H876 and H780; the H8761 is a switch mode (as is the 786) but fairly different, I think. Anyway, sending a copy of the print set over the Atlantic might be slow and expensive :-) BTW, a 7861 is not original equipment for any 11/03, it came off an 11/73S or 11/23plus. Perhaps you have a 22-bit backplane as well? What's the backplane H-number? -- Pete Peter Turnbull Dept. of Computer Science University of York

27 years, 10 months

KIM-1 (Was: Apple I clone (was Re: Apple I Computer For

by franke＠sbs.de

>>> I knew someone who built a KIM-1 from schematics. His departure is that >>> he did it all on the S100 bus. He ran it for a number of years while we >>> were in school together. I need to find out what happened to that >>> machine. >> KIM-1 from schematics ? And where did he get the >> 6530-2 and -3 without taking them from a real KIM ? >> I guess it was more like a KIM alike with 6532's >> (with a bit of additional decoding, changing two >> lines and just not using half of the RAM they could >> work as 6530 without ROM) and a 2716 (also with >> additional address decoding). > I'm not sure how he got around this but I know he did this at a time when > the KIM was still in production and as I recall he did buy some specific > parts directly from the KIM-1 manufacture. I remember the kim keyboard > being genuine. Ah ja. The hardest to find parts today are the 6530-x chips, a multi fonction chip with 1 K mask programmable ROM, mask programmable chip select, I/O lines, timers and 64 Bytes of RAM. They are only available by scraping a real KIM. The nearest replacement is the 6532, witch utilizes I/O, Timer and 128 Bytes RAM. The I/O is almost the same - just two pins have to be shortened, but the chip select is fixed and not equal to none of the 6530-x. I made a design for a KIM clone years ago, but I never did build it actualy. These 6530s are just hard to replace - and if I start to replace, I could also drop most of the other additional stuff not needed today, like cassete interface or 50 mA loop, exchange the direct controlled LED by some 'intelligent' ones and the and would be a 199x KIM but no replika ... So where is the sense... Gruss H. -- Ich denke, also bin ich, also gut HRK

27 years, 10 months

Acorn BBC Micros

by pete＠dunnington.u-net.com

On Nov 3, 21:23, D. Peschel wrote: > > US UK > > NTSC -- smooth and flaky PAL -- flickery but more reliable 60Hz vertical scan - smooth 50Hz vertical scan - more flickery NTSC - flaky PAL - more reliable > VHF frequency bands: VHF frequency bands: > channels 2-13 ? > (1 was scrapped in short order) 2-13 (or was it 2-12?) TV was removed from the VHF band in Europe some years ago. The frequencies have been reallocated for various comms uses. > UHF frequency bands: UHF frequency bands: > channels 14-99? ? > (not sure -- little-used, many > conflicting terms and marketing) 15-65 IIRC > Satellite and cable TV bands: Satellite and cable TV bands: > Too complicated for me to guess ? Mostly C-band? Ku-band > "tuning in" may be required to relate ideal > channel number with actual band number > (which changes from area to area) although they are published in various places > Devices attached to ch. 3 or 4 Devices attached to ch. 36? > (whichever is unused) in past Ch.36 is actually allocated to other uses, so when the "Channel 5" TV station went live, mainly using channels around ch.36, lots of people had problems :-) Most of the TV stations use channels separated by 3 chanels (so 33, 36, 39) to minimise interference effects. > To keep this on the topic of the thread, I *am* interested in getting a BBC. > I guess I'd need a PAL monitor and a 220-volt, 50-hz power supply to run it > though. Does anyone have any ideas? There was a U.S. version with a 110VAC PSU. The standard PSU is a switcher, though, and I know of one person who (inadvertantly) used it successfully on 120V. I got a phone call one day (in my capacity as engineering support person at an Acorn distributor) from a guy who'd bought a BBC and a monitor. He was having trouble with the monitor; it turned out he was working in Saudi Arabia, and had been using a TV originally. All was well, until he upgraded to a monitor bought in the UK. It turned out the monitor was intended for 240V, and didn't like Saudi electricity. Then it dawned on us -- the Beeb was OK, even though it was also running on the same Saudi 120V. YMMV :-) I think the 50/60Hz difference *may* be a problem, since a US monitor will prefer to sync to 60Hz. The US BBCs had a modified MOS ROM, with US scan rates and "colour" changed to "color" in the messages and BASIC keywords. That was about the only difference, AFAIR. The line frequency won't bother the Beeb PSU, but the monitor may not like the scan rate. It's very similar to a CGA-style monitor, BTW. An Amiga colour monitor should work well (Philips CM8833 or equivalent). -- Pete Peter Turnbull Dept. of Computer Science University of York

27 years, 10 months

Acorn BBC Micros

by Roger＠Sinasohn.com

One of the advantages of a web site -- you get tips like this: >From: Crispin Boylan <viewtronix(a)easynet.co.uk> >To: roger(a)sinasohn.com >Subject: Your Computer Collection > >Hi > >Love the site, great to see someone preserving computing history :) > >I live in the UK, and I noticed you don't have our best Micro in your >collection - The Acorn BBC Micro Model B! This is a real charmer, a bit >like the Apple II really, I don't believe it sold well in the states >though due to the aforementioned puter. If you want to put one in your >collection, I know a site selling them: > >http://www.karoo.co.uk/8bs/8bsad.htm >These are really good and refurbished, ?30 excluding postage to foreign >countries, but I know you will get a good deal if you buy one. > >Hope this helps you! > >Cheers. >Cris. > > > > --------------------------------------------------------------------- O- Uncle Roger "There is pleasure pure in being mad roger(a)sinasohn.com that none but madmen know." Roger Louis Sinasohn & Associates San Francisco, California http://www.sinasohn.com/

27 years, 10 months

Classic != IBM AT

by kaikal＠MICROSOFT.com

> -----Original Message----- > From: John Ruschmeyer [mailto:jruschme@hiway1.exit109.com] > There was also, however, a 286 version of the Model 30 which came out a > little later. (I'll let the IBM experts come up with the model#.) "Model 30/286", strangely enough :) Kai

27 years, 10 months

Spring Cleaning - Revisited

by Anthony.Dellett＠Staples.com

>Just to inject a little levity... > >$30 > >Epson HX-20 - Brand new, never used. Works great. >Excuse me, but if it's never been used, how do you know it worksgreat? :-) >(reminds me of an actual classified ad - > "Parachute, used once, never opened, small stain. - $100") Hahahaha! Sorry. I turned it on once to make sure it worked, put it back in the carrying case, and never touched it again :) Tony

27 years, 10 months

PDP11 training troubleshooting

by mbg＠world.std.com

>Were you give (or allowed) a KM11 maintenance card? For those who've not >seen one, it's a board (acutally 2 boards...) that you stick in special >slot in some DEC machines. It's got 28 lights and 4 switches on it. In >the 11/45 it'll let you single-step the microcode (or even the clock >sequencer), display flag signals, etc. You can get the uPC on the panel, >of course. I actually have one of those boards with the unibus signal overlay. It also plugs into a connector on one of the control boards in an RX01 drive. Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+

27 years, 10 months

Spring Cleaning - UPDATE

by Anthony.Dellett＠Staples.com

I have removed stuff that is sold or is pending sale. $10 plus shipping, the RAM cards alone are worth $10 :) Atari 800 (not working, parts?) $30 Atari 1050 Disk Drive (SIO cable included) $30 Atari 1050 Disk Drive (SIO cable included) $30 Commodore 64 (complete in box) $30 Commodore 1541 Disk Drive (in box, works, grey model) $10 Commodore 1541 Disk Drive (in box, dont work, white model) $25 Commodore 1541 II Disk Drive (complete in box) $35 Commodore 128 (complete in box) $600 IMSAI 8080 With: 8080 Processor Card (IMSAI) SIO4 (Godbout w/docs) RAM64 (Godbout w/docs) PIO8 (IMSAI) (it works, it needs a DPST toggle switch (whomever owned it before me moved power off the front panel to a toggle switch in back, it broke recently) or you can move the power back to the front panel.) $40 Kaypro I (incl. boot disk) $40 Kaypro II (incl. boot disk, this has a third party RTC upgrade in it, it needs new batteries) $40 Kaypro IV (incl. boot disk) Make offer NorthStar Horizon (not working, The cards are in pretty good shape but the disk drives are shot and the power supply needs restoration) $200 NorthStar Advantage (Works perfectly, comes with Graphic CP/M 2.2) $20 Osborne I (not working, good for parts. Might actually be repairable. Has the modem upgrade) $30 Sanyo CP/M System (with software, cute little all-in-one system) $30 TI-99/4A Computer (beige model, in box) $60 TRS-80 Model III (with some software) $150 8" SS/SD Dual Drive Subsystem (ICOM, it's a really nice subsystem) $50 "Fat" Macintosh (Mac 512K, works great, in original box with original packing) $20 CoCo 2 (Works peachy) Buyers pay shipping charges FOB Lawrence, Massachusetts. I'm willing to pay parts of shipping on larger items. Whatever isn't spoken for here by next monday (11/9) will be posted on Ebay. Thanks Tony

27 years, 10 months

Classic != IBM AT

by franke＠sbs.de

>> I wish I could forget the Cassiopeia; I don't know if Windows CE is >> significant out of dozens of other OSs but I think that's a good bet. > Come on, it's Microsoft. The first version of anything from Microsoft is > collectible. (I'm hoping that I can collect the last version of Microsoft > software some day soon.) First version yes, especialy when it is a gigantic flop like Windows for Pen Computing :) But when it comes to be a success - or at least it is not floping, I think there is no urgend need to find it. And until now, CE seams to stay as a Me To product (After the Newton retreat the Pilot is just the standard pen device). Gruss Hans P.S.: I'm still looking for a Cristal Newt (MP120 in clear case), and a _reasonable_ priced eMate (And of course any hard and software around the Newt, especialy development tools etc). -- Ich denke, also bin ich, also gut HRK

27 years, 10 months

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