test-drb

test-drb@ccmp.vtda.org

101090 discussions

by lists＠glitchwrks.com

Does anyone recognize this EPROM programmer: https://imgur.com/a/GcmefTl It appears to be for 1702A EPROMs. Working on cleaning it up and figuring it out! Thanks, Jonathan

4 years

Tape Belts, was: FTGH: FH disk drives (and one HH) - Toronto + Scotch DC 300XL tapes

by lists＠glitchwrks.com

The belts are more or less all failing at this point, even on the newer multi-gigabyte QICs. I finally had to stop extracting the good ones from newer tapes, boiling, and reusing because that was not reliable anymore. Seems everyone is using these nowadays: https://www.amazon.com/gp/product/B08536J6Y5 Thanks, Jonathan ??????? Original Message ??????? On Saturday, October 30th, 2021 at 22:30, Nigel Johnson Ham via cctalk <cctalk at classiccmp.org> wrote: > Toby, will those 300XL tapes move the tape if you turn the capstan?? I > > got my drive working but when I tried to see if the tapes would read, > > the rubber band that moves the tape just shattered due to age. > > Try turning the wheel with your finger and see if it moves the tape, if > > it does i would like them. > > Cheers, > > Nigel > > On 2021-10-30 10:28 p.m., Toby Thain via cctalk wrote: > > > On 2021-10-30 1:14 p.m., Toby Thain via cctalk wrote: > > > > > Hi, > > > > > > Located in Toronto Canada, for shipping cost only: > > > > > > - 3 x Hitachi DK516-15 > > > - 2 x Computer Memories Inc (CMI) 6426-S > > > - Microscience HH-1060 (half height; marked bad) > > > - Tandon TM-502 > > > > > > Unknown working condition, but have been stored well. > > > > > > First come, first served, etc. > > > > > > --Toby > > > > Also: 2 x Scotch DC 300XL tape cartridges, good condition. > > > > --Toby

4 years

PDT-150 miniminc floppies wanted.

by scott451＠gmail.com

I have a PDT-150 with a box of blank 8? floppies. Is there someone in this group who can image miniminc BASIC and a system disk onto floppies? Preferably in the Bay Area ?

4 years

Sun-2 and Sun-3 mice (eBay)

by michael.99.thompson＠gmail.com

> > AFAIK, the posts are there so you don't plug your mouse into a phone > jack or a modem port. There are cutouts on the back of the Sun3 > keyboard to admit that connector. > My Sun 2/120 server has an RJ mouse connector next to the RJ keyboard connector on the back of the chassis. My Sun 2/50 desktop client has a DA-15 keyboard connector on the back and has the mouse plugged into the keyboard. I have a black Mouse Systems mouse with a Sun sticker on the front. P/N 900783-002/01. Maybe for a Sun-1? -- Michael Thompson

4 years

Sun-2 and Sun-3 mice (eBay)

by bear＠typewritten.org

https://www.ebay.com/sch/xi_jinping/m.html?item=334195034340&hash=item4dcf9… Hadn't realized before that there were Sun-2 mice which weren't black (were white/beige). I know some folks are looking. No connection with the seller, apart from having bought one of them already. ok bear.

4 years

Vt131 4 sale in St.Louis

by dillera＠dillernet.com

https://www.estatesales.net/marketplace/items/579642 <https://www.estatesales.net/marketplace/items/579642> ADM-3a. Some interesting stuff to be sure. too bad it too far from me. -andy > On Oct 26, 2021, at 2:59 PM, Wayne S via cctech <cctech at classiccmp.org> wrote: > > VT 131 for sale at auction in St. Louis. It?s local pick up only which means they won?t ship. > Some other interesting stuff too. > I have no affiliation to the seller. > > > https://www.estatesales.net/marketplace/items/579633 > > Sent from my iPhone >

4 years

Programming Bipolar PROMs (Tom Hunter)

by mark＠markesystems.com

From: Tom Hunter <ccth6600 at gmail.com> Subject: Programming Bipolar PROMs > The part is an Intersil IM5600CP, but these were also made by others, for > example Signetics and Philips made the 82S23 and TI and NTE made the > faster > SN74S188N. Some vendors still sell these parts and there are even a few on > Ebay. > > How do I program these PROMs? I found one somewhat obscure description of > the algorithm in the NTE datasheet, but I suspect that each manufacturer > had (somewhat) different algorithms. I built a project using Russian clones of the 74188, and ended up building a programmer for them. The programming process is slow (over a minute to program 32 bytes), draws quite a bit of power (the chip is uncomfortably warm afterwards), and it took a while to work out the programming algorithm. Also, as Tom Hunter mentioned, the programming process isn't perfect - about 5% don't program correctly; I don't know if this is my algorithm or the fact that the clones aren't so good. However, once programmed, they seem to work just fine. I bought the Russian devices off eBay for cheap - I think they were about $0.20 apiece, so I got a hundred of them, which I've been slowly nibbling away at as my little product sells. I still have several dozen left; if you'd like you could send me the hex file (or listing - it's only 32 bytes, which I could type in), and I could program a couple for you. I'm not sure I could recommend building your own programmer. It's obviously possible, and there are hand-operated versions floating around on the internet (really hand-operated: set a rotary switch for the bit and five address switches, turn on the power, and push a button for 1-1/2 seconds; repeat for every "1" bit in the PROM), but you'd need more than just the Arduino. You need eight high-side drivers that will handle an amp apiece, plus another driver to switch the power supply voltage between 5 and 13.5 volts, as well as writing a program to implement the algorithm. (actually, it's slow enough that you could get by using relays for all the higher voltage switching.) I don't believe that any modern programmer handles these - if the Data I/O does, then that's probably your only option. ~~ Mark Moulding

4 years

Maybe - re- DMX11

by bobsmithofd＠gmail.com

I left in 79, I designed the AUtodin II mode 1A//Mode VI line usints. Those were synchronous comms interfaces for Bisync.ADCCP/ etc connections while CSS did the Mode 1 I think it was Asynch interface line unit. I suspect DMX is the commercial version of that Autodin II Asynch design, using the KMX/COMMIOP cpu and a dedicated unibus system unit set to support the lineunits BUT I could be wrong maybe DMX was something completely different but it seems to tickle my memory. bb

4 years

Linux and the 'clssic' computing world

by c.murray.mccullough＠gmail.com

To my knowledge the Linux kernel was released to the public 30 years ago around this time. My dear friend swears by it and will never go back to Windows even though WIN 11 is much more secure than previous Windows versions. Prior to Linux there were other much-earlier operating systems for 8-bit and 16-bit machines we classic computer users could use. For emulators now we have a choice but do they work better in Linux or Windows? Happy computing. Murray ?

4 years

Looking for manual for MDB MLSI-LP11

by g4ajq1＠gmail.com

Does anybody have any sources other than bitsavers and vcf? cheers, Nigel

4 years

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