test-drb August 2018

test-drb@ccmp.vtda.org

112 participants
131 discussions

by marvin＠west.net

In getting ready for VCFMW, I started looking at some model 100s and HX-20 notebook computers. Most of them have blank LCD displays, so I figured there might be a common problem. So far, I've found leaky electrolytics on all of them, usually 10 uF, but there are some others with all of them so far associated with the LCD power supplies. The Epsons seem less prone to this than the model 100s, but both have the problem. Has anyone that has done repair work on these computers found the major problem to be leaky capacitors? My gut reaction at this point is to just replace all of the electrolytics. Does this sound like a reasonable longer term approach rather than just replacing the obvious leaky ones?

7 years

ISO Ewing PDP-11 FORTH

by aek＠bitsavers.org

There are several version of PDP-11 FIG-FORTH on the net, I'm trying to find the one from Marty Ewing originally DECUS 11-232, later for RT-11 The writeup for the RT-11 version shows up with a Google search https://manualzz.com/doc/20421230/forth-programming-system-rt11-decus-distr… FORTH PROGRAMMING SYSTEM RT11 DECUS Distribution Documentation File M. S. Ewing 18 October 1978 the files in it are: FORTH.DOC This file. FORTH.MAC Forth Macro source for the Forth "kernel" FORSYS.DAT Standard Forth text file XED.DAT Extended editor text BFP.DAT Basic floating point package EFP.DAT An extended floating point package MSG.DAT A minimal message file. I have some sources which use a Z80 threaded language called Terse that I believe is based on this kernel that I'm trying to archive (it's for some Bally arcade games)

7 years

A couple of fig-FORTH documents FTGH

by toby＠telegraphics.com.au

1) fig-FORTH 6502 Assembly Source Listing Release 1.1 with Compiler Security and Variable Length Names (Sept 1980) 2) fig-FORTH Installation Manual Release 1 With Compiler Security and Variable Length Names (Nov 1980) Free for shipping, located in Toronto Canada --Toby

7 years

DEC LA-12 (Correspondent) keycaps?

by dave＠661.org

I was wondering if anyone had any spare keys for a DEC LA-12 (aka Correspondent) printing terminal. I need the '1' key and the "DATA/TALK" key. -- David Griffith dave at 661.org A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

7 years

First 3.5 inch FDD [WAS: RE: Prototype IBM DemiDiskette drive]

by t.gardner＠computer.org

Well it all depends upon what u mean by "first" The Sony drive and cartridge were not compatible in many ways with what became the physical, magnetic and electrical interface standards for the 3.5-inch drive and cartridge. The standards came out of the "Microfloppy Industry Committee" (Google it with quotes) organized by Shugart Corp. Either Shugart or Tandon was the first to ship drives compatible to the standard. Tandon probably did the first such cartridge. The original Sony drive and cartridge died out and Sony didn't come out with a compatible set until well after Shugart and Tandon. The early adopters of the Sony design like HP then changed to the industry standard design. Tom -----Original Message----- From: Fred Cisin [mailto:cisin at xenosoft.com] Sent: Wednesday, August 22, 2018 1:25 PM To: General Discussion: On-Topic and Off-Topic Posts Subject: RE: Prototype IBM DemiDiskette drive >> I just picked up a Model 350 on eBay, just because I'd never seen a >> Shugart sub 5" drive. >> https://www.ebay.com/itm/Vintage-Sankyo-Shugart-Venture-Model-350- >> Computer-Disk-Drive-/253708808435 On Wed, 22 Aug 2018, Ali via cctalk wrote: > Interesting. I wonder if IBM was looking at those drives for use. The seller (or more accurately the seller's father) used to work for IBM Industrial services in Boca Raton. Well, the SA300 (single sided version) were not the first 3.5" drives, but they may have been the first 300 RPM ones with an SA400 interface. (The Sony 600RPM drives would require more changes) The SA300 could be dropped into a 5150 (with only issues of mounting brackets (Erector set) and power connector) and were supported by some OEM versions of MS-DOS 2.11. IBM public support of 3.5" began with PC-DOS 3.20.

7 years

Datic 2000 / Ampex 844 Documentation ?

by jos.dreesen＠greenmail.ch

Ran into an early CP/M system today, from german company Datic. It is a single-user 8080 system, featuring a delay-line based CRT output and an Ampex 844 fixed platter / removable 14" cartridge driver. Is this simply a Diablo 44 equivalent, as I suspect, or is this a true standalone development from Ampex ? First time I have seen a 14" drive on a CP/M system.... Jos

7 years

The near-mythical IBM color MDA

by schlae＠gmail.com

The NEC Multisync monitor thread reminded me that I used one to produce a video, and I thought a few of you might enjoy it. https://www.youtube.com/watch?v=-TiHFWH4NWk

7 years

CESI VM8128 PDP8-A 128 K MOS?

by useddec＠gmail.com

I have an idea what this might be, but I can't find anything to confirm it on line. Can anyone shine some light on it? Thanks, Paul

7 years

NEC Multisync monitor manual

by chd＠chdickman.com

I am looking for a manual for the original NEC Multisync monitor. Google fails me because of all the follow on monitors had Multisync in the name. -chuck

7 years

DTC TakeTen media?

by cclist＠sydex.com

On 08/23/2018 01:22 PM, jim stephens wrote: > > The Drivetec media was 6mb then 12mb.? The 6mb media worked well if you > repunched the floppies as AT high density media, and when DTC died a > huge amount was sold with instructions on how to do that, as the cost of > media was then still high for 1.2mb media. > I've only seen the 3.3MB and 6.6MB versions. The 3.3 was used on the Kypro "Robie". My 6.6 media was sent to me by the tech support fellow at Verbatim, just before they closed their Santa Clara operation. I already had the drive. The Drivetec drives were also sold by DTC as their "TeamMate" series of external drive/controller combos. There's a German auction of the TakeTen here: https://tinyurl.com/yax6tjvc You can see that the drive slot is considerably thicker than a normal floppy disk--and it's identified as a "Removable Cartridge Disk Drive". Again, I don't recall ever seeing the cartridges. DTC did a lot of strange things. I first knew them as manufacturing a sheet feeder for the Diablo Hitype printer. I still have a few of their disk controller cards and some SCSI controller engineering documents. --Chuck

7 years

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test-drb August 2018