test-drb

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101090 discussions

by peacock＠simconv.com

Kai Kaltenbach wrote: >Other front panels... hmm. > >The Ithaca InterSystems DPS-1 had one. > I still have a DPS-1 in (mostly) good shape. Unlike the IMSAI flat toggle switches it had the triangular ones like DEC PDP-15s. Personally I preferred the IMSAI ones (memories of bloody fingers after toggling in a long binary on an Altair front panel with it's knife edged switches). The DPS-1 works but the motherboard connectors are shot...I got it from a plating/foundry company, covered with crud from the sufuric acid vats next to it. Now if anyone has a nice new pristine Morrow 20 slot motherboard to replace the "etched" one... The other nice feature of the DPS-1 was an o-scope trigger mode on the front panel, sort of a poor man's one channel logic analyzer. If I remember correctly, it also knew something about 24-bit addresses.

28 years, 4 months

Computers that have appreciated (RE: Altair price check)

by kaikal＠MICROSOFT.com

> -----Original Message----- > From: Yowza! [SMTP:yowza@yowza.com] > Besides the Apple 1, does anybody know of a computer system that has > actually appreciated in value? :-) > I assume you mean machines that are worth more than their original purchase price. That would be a pretty short list... notably: - IMSAI 8080 (assuming a base system; a fully configured setup would have cost thousands) - MOSTech KIM-1 (it was so cheap originally it can hardly avoid appreciating since it's a significant historical piece) - Rockwell AIM-65 (ditto) - RCA COSMAC VIP (ditto) If we adjust 1970s dollars to today's rate, not even the Altairs go for more than the purchase price. That leaves only the Apple I in the appreciating column. The only other micro systems (besides the Altair 8800s & Apple I) that fetch significant money, but are nowhere near appreciating from original cost, are: - IBM 5100 - Altair 680 - Processor Technology SOL - Commodore PET (chiclet version) - Apple Lisa - Unproduced prototypes of Atari 8-bit or Commodore equipment Kai

28 years, 4 months

Altair price check

by jfoust＠threedee.com

Regarding the three Altair machines that were recently posted to the net auction at ebay.com - they went from $1525 to $2025. Mind you, these weren't complete systems. The software, extra drives, etc. were auctioned separately. - John Jefferson Computer Museum <http://www.threedee.com/jcm>

28 years, 4 months

front panels

by peacock＠simconv.com

On Mon, 23 Feb 1998, Sam Ismail Replied: >> I also had one homebrew S-100 with the Wameco front panel, which used hex >> displays for address and data but otherwise was identical to the IMSAI front >> panel. Does anyone remember other front panel S-100 cards besides MITS, >> IMSAI, Ithaca, and Wameco? Wasn't there a Byte-8 sold by Olson Electronics >> for a while that also had a front panel? >Yes, the Byte-8 had a front panel with, I believe, a hex keypad and a two >digit 7-segment LED display. Was that just a display driven from a boot ROM or was it a real front panel, with displays directly driven from the bus, examine/deposit, single step, etc.? Usually a hex keypad meant a simulated front panel (CPU actually running a debug program in the boot ROM). A true front panel needed 16 LEDs or 4 hex digits for address, 8 LEDs or 2 hex digits for data, and at least 8 status LEDs for bus signals (SINP, SOUT, MEMR, INTA, etc.). All the panels I have seen also had an extra 8 LED latched output port and sense switch input port. >From cad at Mon Feb 23 17:06:14 1998 From: cad at (Charles A. Davis) Date: Sun Feb 27 18:32:11 2005 Subject: front panels References: <61AC5C9A4B9CD11181A200805F57CD54D09C92(a)red-msg-44.dns.microsoft.com> Message-ID: <34F200E6.40C2(a)gamewood.net> And then there is the Astral 2000. Full front panel (16 address/data switches, 16 leds) and a 4 digit hex display also. Switches to 'load' address or data, run/step, int. etc. When the machine is running normaly, the hex display is used as a 'clock' This machine uses a MC6800 chip. Chuck -- ----------------------------------------------------------- He, who will not reason, is a bigot; William Drumond, he, who cannot, is a fool; Scottish writer and he, who dares not, is a slave. (1585-1649) While he that does, is a free man! Joseph P. 1955- ----------------------------------------------------------- (be sure to correct the return address when using 'reply') Chuck Davis / Sutherlin Industries FAX # (804) 799-0940 1973 Reeves Mill Road E-Mail -- cad(a)gamewood.net Sutherlin, Virginia 24594 Voice # (804) 799-5803

28 years, 4 months

front panels

by kaikal＠MICROSOFT.com

>Yes, the Byte-8 had a front panel with, I believe, a hex keypad and a two >digit 7-segment LED display. The Byte Systems' BYT-8 didn't have a keypad or LED display, just 24 toggle switches and the usual binary LEDs. The front panel plugs directly into the backplane. > On Mon, 23 Feb 1998, Jack Peacock wrote: > Does anyone remember other front panel S-100 cards besides MITS, > IMSAI, Ithaca, and Wameco? Wasn't there a Byte-8 sold by Olson Electronics > for a while that also had a front panel? Other front panels... hmm. The Ithaca InterSystems DPS-1 had one. Somewhere kicking around I do have another "front panel" card that could hardly have been used as a literal front panel... I believe it was made by Jameco or somesuch. It's a full-and-a-half-length S-100 Z80 single board computer card (it's so long, it couldn't have fit in any case) with several segments of alpha display, and a 24- or 30-key keyboard-style keypad. Kai

28 years, 4 months

Panasonic Exec. Partner information wanted

by Marty＠itgonline.com

I was just given a Panasonic Exec. Partner. It looks like a laptop on stearoids. It should have been called a lugtop. It has a red plasma display, full keyboard, twin 5 1/4" floppy drives and a built-in printer. It comes with a convenient folding handle that swings out of the way (so as to not destroy its sleek lines presumeably) and boots fine. Unfortunately no paper came with it so I'd appreciate any information on when this was marketed. It's PC DOS compatible so that dates it post 1981 at least. Marty Mintzell

28 years, 4 months

KNOXM5 RSTS Rides Again!

by allisonp＠world.std.com

<From: "Daniel A. Seagraves" <DSEAGRAV(a)toad.xkl.com> <KL0: 176510 300 <<< What is that? real time clock or line time clock <DM0: 170500 440 DH0 DM is the DH mux and is 8lines <KB9:KB24 disabled - no DH0: controller You have to have 3 controllers for that many lines I believe and it only found one. <And wasn't DM0: a disk controller? Am I supposed to reset the CSRs to th Its that DH muxed serial line thing you looking for. you may have set CSRs though Tim S may know the specifics for U-bus. Allison

28 years, 4 months

Modern Minimalism (Was: Future Computing Trends)

by jfoust＠threedee.com

Roger Ivie <IVIE(a)cc.usu.edu> wrote: >On the other hand, CP/M-68K is available from http://cdl.uta.edu/cpm/. >A lot of it is written in C; with some work, it can be modernized and >updated. What could be more retro than building the ability to port >CP/M to anything with a C compiler? Darn, I had this idea, too. I was going to port it to the Palm Pilot. I looked at the code, and discovered a few things that the owner of that page (Tim Olmstead) hadn't found. I think CP/M-68K was cross-compiled under Alcyon C on a VAX 11/780. (Alcyon also produced an OS called Regulus that was available for Smoke Signal Broadcasting's 68000 systems.) The source contains the name "Tom Saulpaugh", and a web search turned up a book "The JavaOS? Design and Architecture" he wrote. He's at Sun as the architect of JavaOS for Network Computers. Tom Mason also works at Sun, and he worked at DRI on CPM-86, Concurrent CPM-86, and CP/M-86+. Novell appears willing to release source, but Tim suspects that there's no one around willing to discover or document what's available - if anything. For example, the source to CBASIC should be around, but they haven't released it. - John Jefferson Computer Museum <http://www.threedee.com/jcm>

28 years, 4 months

Found a decent use for a PC...

by allisonp＠world.std.com

<No, it's just something about REALLY LARGE frontpanel boxes that rules. <The KA-10 is plain awesome. It's not only a real good hack, but it's <the foundation of timesharing and the ARPAnet. I'll probably never see o <in action, so I'm amassing as much information as I can - maybe it can b I have and it's more than awesome. <re-built? Who knows, they used discrete components... Half the problem is finding one that is complete enough with minimim peripherals. The peripherals also eat power. just the cpu with a hack to use modern disks for power and space savings wouldn't be out of line. As to being discrete, the answer is mostly not completely. It's a hackable machine. <Of course, this is WAY out of my league, but if I keep docs around... You never know. Allison

28 years, 4 months

BBC Model B - video help

by Philip.Belben＠powertech.co.uk

On the subject of BBC video problems, it occurs to me that the BBC micro does scrolling by moving the pointer to the start of the screen (under some conditions?). If you can get it to do this, and see how the display behaves, you may be able to determine easily if it's an addressing problem. Just a thought. Philip.

28 years, 4 months

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