test-drb June 2012

test-drb@ccmp.vtda.org

193 participants
237 discussions

Microvax connecting from console (MMJ) to DB25(female) DCE port

by jeffj＠panix.com

Re: Microvax connecting from console (MMJ) to DB25(female) DCE port >> I've even seen one device which powers down its transmitter unless >> it sees at least one input pin being driven. > Just to jump in...I don't know about machines, > but at least one of the later MAX232 family chips can be configured to do this. > It's a power-saving measure; it shuts down the charge pump. > Note that this is not the "MAX232", but one of that family, > which comprises upwards of thirty completely different chips now. And someone mentioned another driver chip that can tri-state the drivers. I once worked in an environment that kinda used that feature to allow many RS232 devices to share one line. It was a broadcast-mostly hub-network where clients could send requests, but they were normally transmit-disabled. It was collision NON-detect: lack of an ack implied a transmit collision. Mfgrs such as Black Box also made MSU: Modem Sharing Unit. The dumb ones just "or-ed" together the inputs. The "smart" ones used a protocol for multiplexing many serial ports to one. I guess EIA-422 or 485 would be better suited for that, but I suspect the network evolved >from single point to point links to multidrop. -- jeffj

12 years, 1 month

BASIC rom compatibility

by rampaginggreenhulk＠yahoo.com

You (Chuck) and Dave are speaking specifically of so called 100% clones. That I fully expect to be a given. That there exists the mechanism to default to a batch of code in a rom address is news to me though, even in a hundred percenter. But since there is so much compatibility amongst BASICS, as was mentioned recently, and given an empty socket (curious to know which mobos had them, probably few if any) or a board that would extend an existing socket, is it likely an IBM chip would work, even if you had to manually transfer execution.

12 years, 1 month

SCSI-1 DB37

by fast79ta＠yahoo.com

Does any one have a pinout of the DB37 SCSI connector? Might be what my old scanner has on it. Especially if all the ground pins and shields line up. Thanks!

12 years, 1 month

P800 boards

by iamcamiel＠gmail.com

I?ve completed a list of boards in the P800 haul: CPU BOX 1 ? labeled P859 ? CP7RA : 5111 199 62019 (P857R/A CPU for P858,P859) ? MCU3 : 5111 199 77442 (Paper tape, serial control unit (partially populated)) ? 2 x M128E : 5111 199 67592 (128Kx21 RAM) ? MCU2 : 5111 199 78181 (Line printer, card reader control unit) ? MTCU : 5111 199 72467 (Pertec 9 track magnetic tape control unit) ? 2 x M128ES : 5111 199 58622 (128Kx21 RAM) ? MCU3 : 5111 199 77444 (Paper tape, serial control unit (partially populated)) ? AMA-8A : 5111 199 75318 (Asynchronous line multiplexer) ? SLCU2 : 5111 199 69373 (Synchronous serial line control unit) CPU BOX 2 ? labeled P859 ? 2 x CP7RA : 5111 199 62019 (P857R/A CPU for P858,P859) ? M128E : 5111 199 67592 (128Kx21 RAM) ? MCU2 : 5111 199 78185 (Line printer, card reader control unit) ? MCU2 : 5111 199 78186 (Line printer, card reader control unit) ? MCU3 : 5111 199 77445 (Paper tape, serial control unit (partially populated)) ? BIGD : 5111 199 73289 (Big disk (40/80MB CDC) controller) ? BIGD2A : 5111 199 57852 (Big disk) The weirdness of Box 2 is ? obviously ? a second CPU in the same box. This can?t be right. CPU BOX 3 ? labeled P859 ? CP7R : 5111 199 67589 (P857R CPU for P858,P859) ? M128E : 5111 199 67593 (128Kx21 RAM) ? TIMER CARD : 4022 422 20091 ? ? : 4522 107 62304 ? CU-ADIOS : 8222 255 50942 Box 3 has three cards with part numbers in different series from the normal 5111 199 xxxxx CPU BOX 4 ? unlabeled, P856 type M4M box ? 2 x CDD : 5111 199 78176 ? CDD : 5111 199 78177 ? CDD : 5111 199 78178 ? 2 x MCU3 : 5111 199 78198 (Paper tape, serial control unit fully populated)) ? MMU : 5111 199 75183 (Memory Management Unit) ? GPC : 5111 199 79382 (Custom card) Box 4 just looks wrong. I don?t know what the CDD cards are, but there doesn?t appear to be a CPU or memory in there. However, there are P856 CPU?s in the spare cards box, and I found references to the P856 being able to use MOS memory as well as core, so all might not be lost here. EXPANSION BOX ? E2 type (6 slots) ? BIGD2A : 5111 199 57852 (Big disk) ? MTCU : 5111 199 72467 (Pertec 9 track magnetic tape control unit) ? BIGD : 5111 199 59755 (Big disk (40/80MB CDC) controller) ? MTCU : 5111 199 72462 (Pertec 9 track magnetic tape control unit) ? 2 x MX : 5111 199 79335 CASSETTE BOX ? P833 ? K7S2 : 5111 199 79329 (P833-152 Cassette Control Unit) Combined with the spare M-format cards in the haul, the complete list of boards is as follows: ? ? : 4522 107 62304 ? AMA-8A : 5111 199 75318 (Asynchronous line multiplexer) ? BIGD : 5111 199 59755 (Big disk (40/80MB CDC) controller) ? BIGD : 5111 199 73289 (Big disk (40/80MB CDC) controller) ? 2 x BIGD2A : 5111 199 57852 (Big disk) ? 4 x CDD : 5111 199 7817X ? 2 x CP7R : 5111 199 67589 (P857R CPU for P858,P859) ? 3 x CP7RA : 5111 199 62019 (P857R/A CPU for P858,P859) ? CPB : 5111 199 74979 (P856 CPU) ? CPB : 5111 199 76227 (P856 CPU?) ? CPB / CP7B : 5111 199 63142 (P856 CPU?) ? CU-ADIOS : 8222 255 50942 ? 4 x F1MB : 5111 199 6742X (modified for? 5.25" FDD) ? 3 x F1MB : 5111 199 67427 (8" Floppy disk controller) ? F1MBY : 5111 199 58742 (Floppy disk controller) ? FLDB : 5111 199 69667 ? GPC : 5111 199 79382 (Custom card) ? 2 x IOP : 5111 199 73185 (I/O Processor) ? K7S2 : 5111 199 79329 (P833-152 Cassette Control Unit) ? 5 x M128E : 5111 199 6759X (128Kx21 RAM) ? 2 x M128ES : 5111 199 58622 (128Kx21 RAM) ? 3 x MCU2 : 5111 199 7818X (Line printer, card reader control unit) ? 5 x MCU3 : 5111 199 7744X (Paper tape, serial control unit (partially populated)) ? 2 x MCU3 : 5111 199 78198 (Paper tape, serial control unit fully populated)) ? MMU : 5111 199 75183 (Memory Management Unit) ? 3 x MTCU : 5111 199 7246X (Pertec 9 track magnetic tape control unit) ? 2 x MX : 5111 199 79335 ? SLCU2 : 5111 199 69373 (Synchronous serial line control unit) ? TIMER CARD : 4022 422 20091 Looks like I should be able to get a few systems going with these parts. There?s also a second box with spare cards, having different formats. Some of these are double eurocard format, like those used in the P85xE systems. There?s also a spare power supply for a P859 box, as well as a spare power supply for a P856 box. I?m interested in finding out more about the cards I couldn?t identify, these are: ? ? : 4522 107 62304 ? 4 x CDD : 5111 199 7817X ? FLDB : 5111 199 69667 ? 2 x MX : 5111 199 79335 ? TIMER CARD : 4022 422 20091 I?m hoping CDD means Cartridge Disc Drive, and that these are the controllers for the X1215 disk drives. The 2 8? floppy disk drives are CDC BR8A8A type, looks like they are 800KB double sided, double density drives. They?re very dusty. Cheers, Camiel

12 years, 1 month

rl02a vs rl02 whats the differance between the 2

by tdk.knight＠gmail.com

just noticed my 3 rl02's i have ones a rl02a witch has a metal front panel instead of plastic what els is different not seeing anything on a quick google

12 years, 1 month

seeking ATT PC 7300 keyboard caps...letter C and Reset/Break

by nigel.d.williams＠gmail.com

Just acquired a PC 7300 and as I am cursed with always incomplete keyboards would be interested if anyone has spare keycaps for it please. I am missing the letter C keycap and the Reset/Break keycap. Example picture: http://upload.wikimedia.org/wikipedia/commons/e/e6/Att-3b1.JPG I can offer VT100-style keycaps as a trade or paypal. thanks, nigel.

12 years, 1 month

Ukraine?

by dennis_mailing_lists＠conus.info

Hi. Just interesting, is there any lurkers/classic computers fans from Ukraine here in this mailing list?

12 years, 1 month

Raspberry Pi VAX Cluster...

by md.benson＠gmail.com

On 13 Jun 2012, at 14:40, Liam Proven <lproven at gmail.com> wrote: > On 12 June 2012 14:06, Gene Buckle <geneb at deltasoft.com> wrote: >> Uses SIMH on a pair of Raspberry Pi boards. Pretty slick: >> >> http://www.designspark.com/content/raspberry-pi-vax-cluster > > I thought that was pretty elite, as one might say, myself - and > Tweeted it, where it's now spreading quite well. I hope you tweet about mine, I will be blogging it as I go and posting video hopefully so plenty of interest! :) Follow @DECtecInfo :) Hopefully mine will have more nodes and will be rack-mountable with ports to the outside world... maybe ;) -- Mark Benson http://markbenson.org/blog http://twitter.com/MDBenson

12 years, 1 month

Raspberry Pi VAX Cluster...

by md.benson＠gmail.com

On 13 Jun 2012, at 14:26, Rod Smallwood <rodsmallwood at btconnect.com> wrote: > Sheeesh! To clarify, I'm not so much bitter that he 'got there first', just that I couldn't do it yet because I only have 1 board. I'd have started by now but I have no more boards. I am thinking about using my Atom PC and VIA PC as nodes until I have more boards bu that's not ideal, although I can run 2 nodes on the Atom. I have a LOT of reading and learning to do before I can even start so I can't exactly complain about him beating me to the post :P -- Mark Benson http://markbenson.org/blog http://twitter.com/MDBenson

12 years, 1 month

interesting Quora post on Marklar

by spectre＠floodgap.com

Marklar was, of course, the Intel version of OS X which existed in Apple's skunkworks after the apparent demise of Star Trek (classic OS on x86). I say apparent, because this post, allegedly written by the wife of the chief engineer, implies that Marklar rose from the ashes of Star Trek due to this guy's efforts. http://www.quora.com/Apple-Inc-2/How-does-Apple-keep-secrets-so-well/answer… Not sure how true it is; perhaps Al Kossow knows. -- ------------------------------------ personal: http://www.cameronkaiser.com/ -- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com -- Experience only makes you more interesting and marketable. -- Judy Blackburn

12 years, 1 month

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test-drb June 2012