test-drb

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101090 discussions

by spacewar＠gmail.com

Originally Digital Research supplied CP/M in a form suitable for an Intel MDS, and it was up to OEMs to hack it to work on anything else. Since I've got an MDS, I'd like to get an image of a CP/M distribution disk for the MDS. I thought I'd seen such a disk image online a few years back, but I can't seem to locate it now, so perhaps I'm mistaken. I'm interested in any versions; the more the better. Thanks! Eric

12 years, 1 month

Taxan 720-U CRT (and Tandy 1000)

by jules.richardson99＠gmail.com

My contact at the dump had set aside a Tandy 1000 for me (and thankfully the keyboard and a joystick hadn't vanished, like they have with other vintage systems I've hauled away from there). We did a quick search around for the Tandy monitor with no luck, but I did locate a Taxan 720-U display in the monitor pile - the connector is a DE9 which is why it caught my eye. Does anyone have any information on this display? What with the DE9 I was hoping it was EGA or CGA (and compatible with the Tandy), but the few google results I'm seeing suggest it's a multisync capable of 800x600 resolution, which makes it sound more like VGA (and I have a very dim memory of some early VGA hardware being crammed into a DE9 connector, rather than the typical DE15) cheers Jules

12 years, 1 month

FS: Boxed Commodore 128 with 1902A, REU Printer All of it

by slandon110＠gmail.com

Ive decided to part with my boxed C128 Setup. It sits and never gets used. Its in great shape Im asking $300 plus shipping for it, Or Local Pickup, Will be heading to the Flint area tomarrow. Could bring it along

12 years, 1 month

My experiences with a HxC floppy drive emulator on an Amiga 500

by terry＠webweavers.co.nz

My Amiga 500 floppy disk drive was on the way out. It involved laying down some cash, but this worked for me. http://www.classic-computers.org.nz/blog/2014-06-20-amiga500-hxc.htm Terry (Tez)

12 years, 1 month

Electric And AC Sizing For New Building Housing PDP-8s and PDP-11s

by tsg＠bonedaddy.net

Hi, I've just built a new building that will be part machine shop and part vintage computer display area (and workshop for repair, etc.) I'm trying to size power requirements and AC requirements. I know that without specifics as to exactly what I'll be running (and all the options) then it's really hard to come up with anything. At the same time I need to decide and get the building wired up and the cooling set up. I have a number of different racks of PDP-8 and PDP-11 equipment along with other more personal sized computers. Obviously not all will be powered up at once, but I'd like to spec out requirements so that I can at least run a few at a time. Likewise with the AC. I'd like enough AC to be able to run for as long as I want without overheating the equipment or myself (and I overheat easily.) I know some people have been setting up shops recently and I guess I'm wondering what they've been doing for both electrical and AC. Any input is greatly appreciated. Thanks, Todd

12 years, 2 months

DEC8271 shift register

by marco＠familie-rauhut.eu

Hi all, i have here a PDP8/E with a defective M8300 Mayjor Register board. The problem is a DEC8271 shift register that is used for bit 0 - 3 in program counter register. Do anyone know a modern equivalent for the DEC8271? Greeting to all readers Marco * Englisch - erkannt * Englisch * Deutsch * Englisch * Deutsch <javascript:void(0);>

12 years, 2 months

DEC8271 shift register

by steve＠tronola.com

>> i have here a PDP8/E with a defective M8300 Mayjor Register board. The >> problem is a DEC8271 shift register that is used for bit 0 - 3 in program >> counter register. >> Do anyone know a modern equivalent for the DEC8271? >> > >It's a Signetics 8271. The full Signetics part number is N8271B for >plastic package or N8271E for ceramic, or "S" prefix rather than "N" for >-55C to +125C temperature range. > >There is no "modern equivalent". --- Quest shows them in stock for $4 each: http://www.questcomp.com/QuestDetails.aspx?pn=N8271N&pnid=137216&stock=YesO… Steve Lafferty

12 years, 2 months

Electric And AC Sizing For New Building Housing PDP-8s, and PDP-11s

by elson＠pico-systems.com

On 06/19/2014 02:47 AM, cctalk-request at classiccmp.org wrote: > Hi Sean, > > No three-phase available nearby so if I ever do need it I'll be using a rotary > converter or VFD or something. > > Luckily I don't need it at the moment. > > It will likely have it's own transformer and drop. > > I'm sure it will be at least 200A service. There are only a VERY few devices that can be connected to a PDP-11 that need 3-phase power. One I know of is the RP07, but that is really a VAX peripheral. Since it is Massbus, it COULD be connected to an 11/70, though. Possibly also the RP06 might also be 3-phase. In general, though, these machines are QUITE low power compared to higher-end machines like PDP-10's and early VAXes. I can't imagine any PDP-8 system that needs much power. Unless it was loaded with a BUNCH of RK05 drives, I can't imagine it wouldn't run off a single 120V 15A outlet. The PDP-11/45 draws enough power it would need separate outlets for the CPU and the drives. Jon

12 years, 2 months

urgent: anyone between OKC and Dallas?

by mcguire＠neurotica.com

I have an old friend who has developed serious issues who will be driving from North Dallas to Oklahoma City tomorrow. He will have a piece of equipment that I want, about the size of a microwave oven, with him. Is there anyone here along that route who would be able to meet up with him and take it off of his hands? He will dumpster it at the end of his trip if it's not picked up. I will make arrangements to get it >from whoever gets it afterwards. (I have zero knowledge of the geography down there, no idea of what route he will be taking, etc) Any assistance is greatly appreciated. NOTE: I no longer read this list; please reply privately if you can assist. Thanks, -Dave -- Dave McGuire, AK4HZ/3 New Kensington, PA

12 years, 2 months

TD Systems Inc Viking QTO / QDO conversion. QBUS.

by mattislind＠gmail.com

I have a TD Systems Viking QTO MSCP emulating SCSI tape QBUS controller and I found a manual for that one one the net: http://manx.classiccmp.org/collections/antonio/chrisq/TD_Systems_Inc_-_900-… But I rather have a disk controller rather than a tape controller. Or a combined tape and disk. An old post from '99 ( https://groups.google.com/forum/#!topic/alt.sys.pdp11/2XddHq03SQI) indicate that the web address is www.tdsys.com. Accessing this webpage just informs me that the company doesn't exist any more. But someone is paying the domain fee. I tried to email but hasn't got neither a bounce nor a reply yet. I would guess that it is all up to the EPROM and the PAL chip to decide how this card is working. QDO, QTO, QDT, QDD or QDA. The PAL is a simple 16L8 so it is most certainly only used for address decoding and should be pretty simply to change. The EPROM contents is a problem though. I dumped it and did some initial checking with a Z80 disassembler and simple operations like "strings". There are a lot of strings in there. Some of them seems to relate to tape drives, like "EXABYTE", "WANGTEK" and "space forward". But also others that seems to be disk oriented like "Booting from DU0", "Disk common command set" and "Fomat unit". A couple of years ago a someone sold such a controller on Ebay but also included an EPROM and a PAL to convert it. I contacted this seller but never go a reply. Does anyone have this controller? Know anything about it? Has anyone converted it from tape to disk?

12 years, 2 months

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