test-drb July 2018

test-drb@ccmp.vtda.org

148 participants
163 discussions

by aek＠bitsavers.org

https://www.ebay.com/itm/292646012304 local pickup only the reserve is >$1500 I would guess the CDC Winchesters are toast if they haven't had their heads locked

6 years

Tektronix 4113

by jacob.ritorto＠gmail.com

Any interest in a Tek 4113 terminal (minus display)? I have one collecting dust here and would like to trade for older Tek restoration help / other pdp11 stuff. The keyboard is damaged but otherwise it's just old and dirty, haven't opened it up. Located in western Pennsylvania. thx jake

6 years

68k development, Avocet Development

by carlojpisani＠gmail.com

hi does anyone happen to use Avocet Development Tools for m68k? how good/bad is it?

6 years

GoTEK SFR1M44-U100...

by jnc＠mercury.lcs.mit.edu

> From: Liam Proven > one of the questions was about "the early days of the old-time > internet, if you're old and you've been online forever." > It was about Myspace. Yikes. Send them this: http://www.chiappa.net/~jnc/tech/sflovers/ Noel

6 years

SMUFDDV4@1104

by bill.gunshannon＠hotmail.com

I asked this in the GOTEK thread but I think it got lost in the chatter. Does any of this apply to the equivalent devices with the board labeled SMUFDDV4 at 1104? I have a few of them and would love to make them work with non-PCs as well. bill

6 years

Info needed: CMI 1600, CDC Omega/480, IPL Systems, Olivetti 5300

by johannesthelen＠hotmail.com

Anyone familiar with these PCMs? I got a CMI 1640 and little help needed. Here's photos: https://drive.google.com/drive/folders/1w74AYe6lRSn9gJhyKVlBYAq5zRDWybSw?us… What this 370 clone is exactly? If I have understood right, Steven Ippolito's IPL Systems Inc developed the original machine and CMI (Cambridge Memories Inc) made them. Also these sold as Omega/480 and Olivetti 5300 series. Later CMI made their own versions and I believe this one of those. But I haven't found model 1640. So is this 1641..? What is difference between CMI and others? Microcode? I got belong with the machine a couple manuals, Maintenance and Theory of Operation. Unfortunately original microcode disk is missing (and 8" drive...), so that would be needed if I ever want to fire this thing up. Any ideas where I could find a one? All ideas & info are welcome! - Johannes Thelen johannesthelen at gmail.com Finland Before microcomputers blog (Finnish) http://ennenmikrotietokoneita.blogspot.fi/

6 years

Anyone have a HALstation 300 install CD?

by aek＠bitsavers.org

I'm evaluating two that came in as a donation, and the donor didn't have any passwords

6 years

GoTEK SFR1M44-U100...

by cctalk＠gtaylor.tnetconsulting.net

Does anyone have any experience with the GoTEK SFR1M44-U100 floppy drive emulator that reads ""images from a USB flash drive? Good? Bad? Indifferent? Run for the hills? -- Grant. . . . unix || die

6 years

Reading HP2000 tapes

by dan＠ekoan.com

Hello, I recently received the following request: > I just recently found a (9 or 7 track?) tape of mine made on an > HP2000 (probably C, maybe F) in 1977 from a DUMP of two accounts. > I've had it for 40 years with nothing to process it. Now I have > simh to process it on, but nothing to read it with. Does anyone have experience and the ability to read such a tape? Cheers, Dan

6 years

Info, spice model parameters for DEC pulse transformers?

by josephoswald＠gmail.com

I'm trying to model the PDP-1 DEC system models, first with SPICE (ngspice on Linux), then with VHDL. I'm struggling to understand the properties of various transformers in the system module circuits, most importantly (at least, the ones I see in schematics I want to model) 2 winding T2003 (used in the 1304 delay, 1410 pulse generator, 1540 sense amp, 1607 pulse amplifier) 2 winding T2026 (used in the 1410) 4 winding T2029 (used in the 1201 flip-flop) 3 winding T2033 (used in 1204 flip-flop) 2 winding T2048 (used in the 1607 pulse amplifier, but the maintenance manual suggests this might be substituted with a T2010?) The maintenance manual also suggests uses for T2006, T2012, T2017, T2018, T2019, T2020, T2021, T2023, T2024 are used in modules I don't have schematics for yet. Is there any source for information about these? Basic specs? I don't even know what the turns ratios are for these parts, much less plausible inductances, so my spice models misbehave pretty badly. I've also posted a question on Reddit about this https://www.reddit.com/r/AskElectronics/comments/8zsyuq/reverse_engineering… --Joe

6 years

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test-drb July 2018