test-drb October 2007

test-drb@ccmp.vtda.org

228 participants
467 discussions

by ajp166＠bellatlantic.net

> >Subject: Re: PDP-11 graphics products > From: "William Donzelli" <wdonzelli at gmail.com> > Date: Tue, 09 Oct 2007 20:23:08 -0400 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >> UNIBUS: VT30, VS100 (wasn't X developed on this?) > >I think it was developed on a VAXstation 2000? I don't think so, as my memory of X predates VAXstation2000. >A long time ago I had a Unibus color vector graphics board from some >third party. I remember it had some really weird coax connectors for >output signals. I may have a few of the Qbus versions, Need to dig them out. Allison > >No amount of truth serum will be able to dig up any facts from >my head, however. > >-- >Will

17 years, 2 months

PDP-11 graphics products

by jfoust＠threedee.com

At 09:34 PM 10/9/2007, you wrote: >I know naught of its specs, but what of the Terak system, which I >believe was 11-based? The original Terak 8510/a was 320 x 240 mono square pixels with hardware smooth pan and scroll, and downloadable character sets. My rarely updated Terak page: http://www.threedee.com/jcm/terak/index.html There were subsequent Terak models that I believe doubled the resolution and added color, but I don't know much about those models. - John

17 years, 2 months

reforming capacitor tutorial/walkthrough

by compoobah＠valleyimplants.com

> With new hardware, it may be impossible to secure proper documentation > and it may be difficult to impossible to decipher what's happening > inside of such tiny chips. Not completely on-topic, but a recent acquisition by the school had a schematic in the so-called "user's manual" that dutifully showed all the interconnections to the black-box ASICs and the 2 or 3 transistors (and handful of passives). All in a 4" square area.

17 years, 2 months

Extracting CDOS files

by lynchaj＠yahoo.com

[snip] > >Masking out pin 8 (Index) on the 34-pin connector has no effect, I >still get: > >Error reading diskette B: (Cyl 1, Side 1, Sect 1) >Sector not found > >This sector DOES exist, both ImageDisk and TeleDisk can read it fine, >however no amount of "Retry" will convice 22disk to read it. Dave, Have you considered using the Tim Mann software (cw2dmk) and the Catweasel? That would pull up whatever information is on the disk and you could use it to diagnose what is wrong with the disk. It won't decode the CDOS file format but it will give you the sector headers and the raw sector data. If you send me a disk, I will return it with a raw disk Catweasel image >from cw2dmk. Best of luck with your project. Andrew Lynch

17 years, 2 months

1541-III group buy?

by ethan.dicks＠gmail.com

On 10/7/07, Zane H. Healy <healyzh at aracnet.com> wrote: > I have been looking into the parts needed to build one of these. Not > even including the price of the PCB or MMC/SD card, it isn't exactly > cheap. It looks like it will cost about $64.00 just for the parts. See below... > It is also worth noting that most of these parts are surface mount. Indeed. > I've done up a web page showing the price breakdown when ordering the > parts from Newark, as they are a US arm of Farnell. > http://www.aracnet.com/~healyzh/commodore/1541-III.html It also > includes the Manufacturer and Newark part numbers. Nice work. I do notice that you've listed two MCUs, a PIC 18F252 and a PIC 18F2620. Presumably, the design takes one _or_ the other, not both. Also, it looks to me like those 0.1" (2.54mm) jumpers is a bit high - $0.25 each, min q. 10. Other killers are the $15 handling fee (presumably because the order value isn't up to their minimum value - $50?), the RL73K2BR33JTD resistor (1 required, min q. 10 @ ~$2), and various min quantity orders. What might make more fiscal sense, to me, at least, would be to order enough parts to build two, rather than one. More of the teeny parts would be used up for zero additional expense, plus the order might cross the min-order threshold and avoid the $15 service fee. Of course, if it were _my_ order, I'd find some MCUs or other parts to round up my own order, just because I'd rather have $15 worth of additional components than pay a $15 fee that gets me nothing substantial. Thanks for laying everything out in a very plain and clear fashion. It's a great starting point, especially for those who might have to order every single part to build a kit (I see large numbers of things I'd pull from my own stores). -ethan

17 years, 2 months

Olivettie Programma 101

by wmaddox＠pacbell.net

There's what appears to be a very nice Olivetti Programma 101 up on eBay, with a little over a day to go and no bids. It's in the Netherlands. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=8801280590&sspagename=AD… The Programma 101 was a very advanced programmable calculator, introduced in 1965. Discrete transistors, delay-line memory, magnetic card I/O. I've exchanged a little bit of email with the seller. He says its been in storage for a long time, and a couple of rubber belts inside have turned gooey, but looks to be complete and in otherwise good shape. If you want a little bit of discrete-transistor goodness, I doubt you can find it in any smaller package than this (Ok, so a 9100A/B has both discrete transistors *and* core memory, but the Programma 101 was earlier.) I don't have any relation to the seller, I just decided that I wasn't going to bid on this, so I'd make sure the list saw the listing -- this is a very desirable machine and I figure someone, maybe one of the UK folks, would go for it. --Bill

17 years, 2 months

MFM or ESDI QBUS controller for one PDP-11/23 PLUS

by ajp166＠bellatlantic.net

> >Subject: Re: MFM or ESDI QBUS controller for one PDP-11/23 PLUS > From: "Glen Slick" <glen.slick at gmail.com> > Date: Tue, 09 Oct 2007 11:55:21 -0700 > To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org> > >On 10/9/07, Allison <ajp166 at bellatlantic.net> wrote: >> The only MSCP boards I've used that didn't require breakout were >> SCSI. >> > >I have at least three Q-bus MSCP ESDI controllers that have standard >20-pin & 34-pin IDC header ESDI connectors, no breakout required. >Emulex QD21, Dilog DQ696, Sigma SDC-RQD11. They are hard disk only >though, so maybe in general controllers with floppy support do require >breakout adapters. That may be the difference as all of my MSCP with RQDXn replacements need a breakout or a funky cable to do it. I do not have anything for ESDI. Allison >I also have an Andromeda ESDC Q-Bus ESDI controller which I haven't >been able to use yet as I am lacking documentation on how to configure >it. Anyone have a manual? I don't see any Andromeda manuals at all >on bitsavers. > >-Glen

17 years, 2 months

VT100 flyback / geometry

by cc＠corti-net.de

Does anyone happen to know the exact part number of the flyback transformer in the DEC VT100 terminal? The VT100 in question has the 'DEC' type video board, not the 'Ball' type. Is there a matching HR-Diemen or equivalent part number? Oh, and questions concerning another VT100: What may cause a bad geometry of the picture on a VT100 (slight trapezoid and pincushion; Philips CRT)? The only adjustable magnets are the two sets of rings on the neck, one for the position and one for the focus (it's a magnetically focused CRT as most monitors are). Christian

17 years, 2 months

choosing a 360k FDD

by dgriffi＠cs.csubak.edu

So, I'm faced with a bunch of 360k floppy drives. One of them I will put in my main desktop machine for replicating floppies for, say, my C64, Kaypro, etc. What should I look for when choosing such a drive? The best specimen I have right now was taken from a Morrow Micro-Decision. According to the tag, it's a "TEC FB-503". Can someone tell me something about this? By the way, I have an IBM-branded full-height Tandon that I will trade for the "ideal" half-height. -- David Griffith dgriffi at cs.csubak.edu

17 years, 2 months

MFM or ESDI QBUS controller for one PDP-11/23 PLUS

by ajp166＠bellatlantic.net

> >Subject: Re: MFM or ESDI QBUS controller for one PDP-11/23 PLUS > From: "Sergio Pedraja" <spedraja at gmail.com> > Date: Tue, 09 Oct 2007 08:57:56 +0200 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >Hi, Allison. > >I'm perplexed. The RQDXn controllers are MFM and Floppy. Best shot >> is late firmware RQDX3 as it does RX33 and most all MFM drives. Its >> also easier to find. >> >> >At least as I can remember, the RQDx3 needs an internal distribution > panel. I'm searching for ONE single board. Understood. Most of the nonDEC FM/EDSI boards still require a distribution pannel as they were targeting DEC systems. At a minimum you need to make a hybrid cable to use them with one drive. How can you tell? Simple, if the board is said to do FM/EDSI and has only a 50pin connector a breakout board (distribution pannel) is required. Most do. I have several differnt examples of nonDEC MSCP controllers for floppy and hard disks and they all like the 50pin cable to breakout. There may be some that do not I don't have one. Actually there are several possible distribution or breakout boards. They primarily serve to translate the 50pin RQDX cable to the more typical cables used for floppy and FN/EDSI disks. One is the distribution pannel used in the BA23 and its only connectors and wires so easily duplicated. Its function is to take the 50pin cable from the RQDXn (or nonDEC MSCP) and route them to the 34pin connector for floppy and the 26/34 pin cables used for MFM. It is located in back of the drive bay of the BA23 and can be used outside of BA23. The second is the M9058 used in the BA123 and that is a dual width Qbus board that can support 1 floppy and 3 hard disks. It's Qbus but only takes power for running the local buffers and extended device select plus providing the interconnect point for the ready/writelock switch pannel. While it appears complex it's really trivial and is better described as a breakout board. If You get a M9058 it is not required to install it on the Qbus, only provide it with needed power if that is mechanically more suitable. The reason for that is while it's dual width it's thick due to the presence of many connectors. The M9058 is typically located outside the BA123 backplane cage nearest the disk bays for easy cable routing. There is a third board RQDXE that is for use mostly in BA23s for extending the RQDXn outside the case for additional drives. Its of limited utility as breakout/distribution. I know this from fitting two half height HD + RX33 in ba23 and also putting RQDX3 in BA11S with RX33 and 3 RD52s. Hope this helps. The only MSCP boards I've used that didn't require breakout were SCSI. Allison

17 years, 2 months

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test-drb October 2007