test-drb

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101090 discussions

by tdk.knight＠gmail.com

i rescued 2 today that were buried for a yr in mud cleaned it up the one that was still one peic https://imagizer.imageshack.us/v2/882x662q90/923/M4e2cc.jpg noticed it was starting to curve as it dried so i cleaned the mud off it and put it between a towel and some concreat blocks? that should stop it >from curving right and help corect the bit that started? https://imagizer.imageshack.us/v2/496x662q90/922/RjHMCe.jpg i got a second one of these thats snaped in half i found in the same location still has all the studs atached so prolly use it for parts to fix this one or ill fire up the shop bot at the hackerspac any advice?

9 years, 4 months

101C Modem boards

by pete＠petelancashire.com

https://goo.gl/photos/GdcXVcWBS43Gh3UU7

9 years, 4 months

BETSI Expander for the Commodore PET

by ball.of.john＠gmail.com

So it seems in the early days of the PET a company by the name of Forethought Prouducts sold an expansion module called the BETSI which plugged into the expansion bus of the PET and gave you four S100 slots. If you google around you can find a flyer advertising the unit and optional power supply and the owners manual which touches on assembly, component locations and the schematics. It talks about adding sound voards, additional video outputs, expanding ram and attaching directly to a larger S100 frame. Beyond that I can find absolutely nothing else about it, much less a more recent photo of one. Has anyone here ever used one? How practical were they in reality? Suppose I went and built one. Does anyone have the PCB layout templates so I could get a board etched or will I have to stick to the schematic and build one by hand? -John

9 years, 4 months

110 Baud modem

by pete＠petelancashire.com

Bell 101C https://goo.gl/photos/hrhAwvzMBLWWteXu6 https://en.wikipedia.org/wiki/Bell_101 -pete

9 years, 4 months

8i front panel hmm

by tdk.knight＠gmail.com

so anyone thats recalls i found a crushed pdp 8i last yr on friday i was back at the Sean and found the panel in paces actualy found parts of two of them. one was painted the other was layers of vynal. thought that was interesting https://c1.staticflickr.com/5/4193/34379004552_1bdf3f3431_b.jpg doesnt include the tub of parts i have... i need to go back and hunt more it seems https://c1.staticflickr.com/5/4185/34539786085_8582a38730_b.jpg

9 years, 4 months

HP Draftmaster RX pen plotter needs love

by philipp.pap＠gmx.net

Hi Michael, dear board Did you solve your power supply problem? My Draftmaster I did work for 1 hour, I did even manage to do a demo plot. Then it died, right before my eyes the display got brighter and brighter and now - nothing when powering on, except a humming sound. I think that I?m responsible for the dead, as the plotter stood in an attic for 20 years, meanwhile power was raised from 220 to 230v (+-10%) in Europe. I realized that the input power can be adjusted between 220 and 240v at the power inlet of the plotter (on the top there is a small stage for a screwdriver, then the cover opens and the rotating think can be taken out)!! Anyhow, now I have 41 and 83 Volts at the 42 and 85V test points, but always 0 Volts at the +5,-12,+12,+15V test points. The fuses are good and the secondary transformer seems good as well. Right now I am waiting for an esr-meter to test the capacitors, any clue would be extremely helpful for me! With nice greetings Philipp PS: tinkering with this masterpiece of engineering is fun, but now my back hurts, but it is worth it

9 years, 4 months

cctalk Digest, Vol 35, Issue 9

by earl＠baugh.org

> Date: Mon, 8 May 2017 21:02:39 -0400 > From: william degnan <billdegnan at gmail.com> > Subject: Re: BETSI Expander for the Commodore PET > > On Mon, May 8, 2017 at 8:35 PM, John Ball via cctalk < > cctalk at classiccmp.org> > wrote: > > > So it seems in the early days of the PET a company by the name of > > Forethought Prouducts sold an expansion module called the BETSI which > > plugged into the expansion bus of the PET and gave you four S100 slots. > If > > you google around you can find a flyer advertising the unit and optional > > power supply and the owners manual which touches on assembly, component > > locations and the schematics. It talks about adding sound voards, > > additional > > video outputs, expanding ram and attaching directly to a larger S100 > frame. > > Beyond that I can find absolutely nothing else about it, much less a more > > recent photo of one. Has anyone here ever used one? How practical were > they > > in reality? Suppose I went and built one. Does anyone have the PCB layout > > templates so I could get a board etched or will I have to stick to the > > schematic and build one by hand? > > > > -John > > > > > At VCF SE Don French talked about the S100 expansion he created for the TRS > 80 Model 1. Guess these did not meet with much success. > BTW, I spoke with Don over dinner after the show and he told me that his son apparently archived some stuff when he moved out to NV (he had told me earlier that most of his machines got sold/trashed/lost during his divorce ). I particularly asked him to look for one of the S100 expansion boards... Will let you know if he found any... Earl

9 years, 4 months

SMS 8" Floppy Drive

by dj.taylor4＠comcast.net

All this talk about 8 inch floppies got me to look at a unit I have stored away. It is a rack mounted dual 8 inch floppy drive, SMS FWT Series. Model - FWT0522I-R It has one IDC connection on the back, 34 pin. The formatter in the unit has numbers - 1001828-0001 H and 0003451-0001 J written on it. Bitsavers didn't have anything about the FWT05 model, does anyone know if a Qbus controller exists for this? If it does perhaps I could get it working and hook it up to my MicroVax II, that would be an odd combination. Doug

9 years, 4 months

110 Baud modem

by COURYHOUSE＠aol.com

"And the teletypists knees and feet were always kept warm..." What is the weight of this modem Pete? Being the the earlier rev of 101 was earlier technology for SAGE I wonder how large it was? Ed# In a message dated 5/8/2017 9:40:52 P.M. US Mountain Standard Time, cctalk at classiccmp.org writes: Bell 101C https://goo.gl/photos/hrhAwvzMBLWWteXu6 https://en.wikipedia.org/wiki/Bell_101 -pete

9 years, 4 months

Re: Extracting files off “unknown” 8 inch disks. Any thoughts…

by terry＠webweavers.co.nz

Hi guys, Just tying up some unfinished business. Right at the beginning of this thread I said... >Guys in the building next door to me (a Science lab) have found some 8 inch floppy disks. >They want to see what?s on them, or at least to archive them. >They have no idea what machine these disks were used with, or the software was used to write the files. >They may be CP/M, or some other format entirely. Now that I've got the 8 inch disk drive up and running and have some experience with it, I thought I've give these disks a go. It turns out these disks are from a VAX machine. Assuming the OS is VMS, I scoured the Internet for something that might read them. Eventually I found Hunter Goatley's v 1.3 of Paul Nankervis's ODS2 at http://vms.process.com/scripts/fileserv/fileserv.com?ODS2 . This program reads VMS disks from PCs. The zip had a Win32 executable included. The executable seems to run ok in the DOS window of the Win98 machine I've attached the drive too, in that the Command Line Interface seems fine and I can type and issue commands. However, I've had no luck with mounting the disk in ODS2. The error I get (consistent over all disks) is: "Sector 1 read failed 87 PHYIO Error 500 Block 1 Length 512 (ASPI: 0 0 0) Mount failed with 500" I may have reached the limit of my skill envelope. Before I abandon the task and suggest to these researchers to consider sending these disks to Chuck C., does anyone know... 1. What that error means? 2. If it would make a difference that I'm running the Win32 exe in Windows 98, rather than NT, 2000, XP etc.? The documentation doesn't mention Windows 98, however the program does start to a CLI without a problem. 3. I'm not sure ODS2 was built with 8 inch disks in mind? Would it make a difference? CP/M disks in the 8 inch drive can be accessed and read/written to under MS-DOS by the machine I have the drive hooked up to, so I don't think it's a hardware issue. 4. How likely is it that disks from a 1985 VAX is in some weird proprietary format OTHER than VMS? Any comments most welcome. Thanks! Terry

9 years, 4 months

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