test-drb

test-drb@ccmp.vtda.org

101090 discussions

OT: SC/SC couplers available (was: Re: 10Base-FL)

by pete＠dunnington.u-net.com

On Feb 7, 13:44, Adrien Farkas wrote: > pete(a)dunnington.u-net.com (pete(a)dunnington.u-net.com) wrote : > > >SMAs suck big time, and couplers for STs are expensive. ^^ Oops, did I really write that? I meant that couplers for SCs are expensive; ST couplers are cheap. > a propos fiber couplers, does anyone have a few they might miss? I'm > after SC/SC couplers preferrably with direct SC duplex connector > pluggable. I might get a few, but those aren't ready for duplex > connectors, just single SC simplex. Duplex ones are just two simplex ones side by side. Use tape or glue. -- Pete Peter Turnbull Network Manager University of York

23 years, 2 months

CCS 2422 Floppy Disk Controller

by ekklein＠pacbell.net

I recently acquired a California Computer Systems model 2422 Floppy Disk Controller Rev B. (S-100) in what appears to be good condition but missing a 2716 EPROM presumably containing the onboard BIOS. Does anyone have this card and the capability of providing me with a copy of the PROM or at least a dump of it? I'd also love to get my hands on the docs, if available. Thank you, Erik

23 years, 2 months

Interesting finds

by Fred.van.Kempen＠microwalt.nl

Hi, While hauling some VAX and StorageWorks stuff yesterday, I bumped into a Philips PTS6000 machine (actually, two.. a larger one, and a smaller one), some HP stuff (looks like HP Big Iron) and the cabinet of a DECarray system. Anyone interested? Pics available. --fred

23 years, 2 months

PS2 Mouse

by teoz＠neo.rr.com

I was wondering if there ever was a PC PS2 type mouse addon card for old 386 or previous AT type computers? I know there were bus mice, but thats not the same. The reason I am asking is because I have a PS2 KVM switch and want to get my 386/DX40 computer connected to it (it doesnt have a ps2 header).

23 years, 2 months

6502 cycles and subtleties (was Re: Assembly on a Apple IIc+)

by pete＠dunnington.u-net.com

On Feb 9, 10:55, Eric Smith wrote: > > Are you sure? My understanding is that PLP and PLA increment the stack > > pointer *before* fetching the byte off the stack. > [...] > > Maybe you're thinking of PHP and PHA ([SP]:=A; SP:=SP+1), which take one > > cycle less than PLP/PLA? > > You're right, I was confused. Phew! I was beginning to wonder if the 6502 is more bizarre than I already knew :-) You missed the mistake though -- I should have written SP:=SP-1 (no it wasn't a test, I only just noticed). -- Pete Peter Turnbull Network Manager University of York

23 years, 2 months

6502 cycles and subtleties (was Re: Assembly on a Apple IIc+)

by pete＠dunnington.u-net.com

On Feb 8, 19:02, Eric Smith wrote: > Well, I haven't counted them, but pretty much all instructions that > use the ALU do that. This includes ADC, SBC, ORA, AND, EOR, BIT, > and (when the accumulator is the destination) LSL, ASR, ROR, and ROL. > And the PLP and PLA instructions, which increment the stack pointer > using the ALU during the next fetch. Are you sure? My understanding is that PLP and PLA increment the stack pointer *before* fetching the byte off the stack. The 6502 stack pointer always points to the next free location on the stack. It's possible that it does something like: fetch instruction decode, and set up ALU to generate SP+1 fetch [SP+1] add 1 to SP while fetching next instruction Maybe you're thinking of PHP and PHA ([SP]:=A; SP:=SP+1), which take one cycle less than PLP/PLA? -- Pete Peter Turnbull Network Manager University of York

23 years, 2 months

PS2 Mouse

by teoz＠neo.rr.com

PS2 works off the keyboard controller, I was hoping somebody might have made a specialty board with keyboard controller allowing older machines to use ps2 hardware ----- Original Message ----- From: +ACI-John Allain+ACI- +ADw-allain+AEA-panix.com+AD4- To: +ADw-cctalk+AEA-classiccmp.org+AD4- Sent: Sunday, February 09, 2003 12:37 PM Subject: Re: PS2 Mouse +AD4- +AD4- I could use a USB +AD0APg- PS/2 mouse adapter, so far I have not +AD4- +AD4- found any such animal. I've found plenty that go the other way. +AD4- +AD4- Think this is one. It isn't a passthru. +AD4- http://www.cyberguys.com/cgi-bin/sgin0101.exe?T1+AD0-131+-0870 +AD4- +AD4- +AD4- On the subject... +AD4- I see a lot of PS/2-female to RS232/D9-male adaptors. +AD4- I assume that these are for signal sensing mice, +AD4- since these adaptors Are passthru, and I get the impression +AD4- from this list that PS/2 signals aren't RS232. +AD4- +AD4- John A.

23 years, 2 months

PDP11 RSX-11M operating system manual

by anheier＠owt.com

Hi, I have a large binder containing a DEC PDP11 RSX-11M System Generation and Management Guide, version 3.2, June 1979. Also included is a RSX-11M/M-Plus MCR Operation Manual and two bound mini references. All are in excellent shape. Best offer + shipping. Thanks Norm

23 years, 2 months

Odd ideas that I've had lately...

by cb＠mythtech.net

>I'd hate to >hose the PalmOS flash - dunno if there's a way to get it back without >building your own external re-Flasher (in the case of the IIIs and older >that *have* removable SIMMs). I think they may have an ability to recover built in. I know when I upgraded the OS on my wife's IIIx, I had a problem with the upgrade, and the flash didn't complete. The Palm wouldn't boot and I thought I was hosed. But a check in the directions offered a recover method. There is a sequence of button presses you can do that drops the Palm into "debugger" mode, and from there, the upgrade utility could restart the flash process and write the OS again. Of course, you would need a copy of the Flash ROM/OS and a utility to write it. I know you can dump your current ROM to file with the tools in the Palm Emulator available from Palm... but the only tool I know to write it back to the Palm is their OS upgrade tool, which means you would have to shell out for the upgrade (or find someone else that already did and use the software that they have). -chris <http://www.mythtech.net>

23 years, 2 months

attache' where are you?

by paulm064＠icqmail.com

I have been searching for info of an old laptop computer i have . Following details are all i have found: Attache' Forefront 286 model : LV-286D power supply : 17Volt ? 2.7Amp ? Battery : 12Volt 2200mAH NiCAD 3 pin connector - 9.8"x2.1"x1.1" Has detachable keyboard. Does any know if manufacturer was taken over by another? Need details of power supply and battery connector pollarity and or gifs of same . Don't know where else to look. Thanks Paul

23 years, 2 months

6502 cycles and subtleties (was Re: Assembly on a Apple IIc+)

by pete＠dunnington.u-net.com

On Feb 8, 11:41, Eric Smith wrote: > Pete wrote: > > You must be thinking of some different 6502 to the rest of us :-) As > > Sellam said, no 6502 opcode takes less than two clock cycles to > > execute, and most take more (up to 7): the only 2-cycle instructions are > > the ones with implied addressing, like RTS, CLI, TAX, ... > > Not RTS, that takes a bunch. Oops, wrong column! Yes, it takes 6. > There is a little bit of pipelining internally, but it's not really > obvious. The last ALU operation of an instruction is generally done > during the same clock cycle as the fetch of the next instruction. > For instance, when you do an "ADC #35" instruction (add with carry > immediate), it's a two-cycle instruction, but it really takes three > cycles to complete -- the third cycle is overlapped with the following > instruction's fetch. During the first cycle the opcode is fetched, > during the second cycle the immediate operand is fetched, and during the > third cycle, which is the first cycle of the next instruction, the actual > add occurs. True. Most instructions don't work like that, though. > > There aren't two CPU cycles per clock cycle. Perhaps you're thinking of > > the fact that the 6502 uses a two-phase clock, and does part of the CPU > > cycle during phi-1, and part during phi-2? > > Perhaps the original poster thought that, but it's just the old standard > two-phase NMOS logic. It takes two phases to do just about anything > internally, so it's not a matter of doing two things sequentially in > one clock cycle. (A small number of things occur in parallel in some > cycles, though.) Yes, *I* know that, but I don't think Jim did :-) -- Pete Peter Turnbull Network Manager University of York

23 years, 2 months

ast cc-232 serial card

by n8uhn＠yahoo.com

I am looking for a copy of the manual of jumber/switch settings and pinout's of the ast cc 232 async/sync serial card. looking at the jumper page (after the link was posted) i found nothing. jpg scans to my email would be great - just attach them. n8uhn at yahoo dot com (replace the "'dot" with "." and "at"' with "@" Thanks, Bill

23 years, 2 months

Assembly on a Apple IIc+

by pete＠dunnington.u-net.com

On Feb 8, 16:12, Jim Keohane wrote: > I'll type more slowly: > > Question #1: > > If an instruction that takes two cpu cycles (as Sellam Ismail cited as a > minimum) and there are 2 cpu cycles per clock cycle then how many clock > cycles did this one instruction take? > > Answer: one. NO. There NOT two CPU cycles per clock cycle. Sellam cited two CLOCK cycles minimum per instruction. He is correct. I've been been building 6502-based devices and programming 6502 code on and off since 1981, and I suspect Sellam has been arund 6502s nearly as long; we're both accustomed to calculating how many cycles routines take. The 6502 uses several clock cycles per CPU cycle -- if by cycle you mean a fetch-execute cycle. That's exactly the opposite of what you're claiming. > OK. OK. I'm being cute. But the 6502, sans Woz's Apple ][ > sneakiness for video, can do two memory fetches per clock cycle. No, it can't. Go read the data sheet. The *system* can, providing your memory is fast enough that you can run it twice as fast as the CPU -- which the Apple and some other machines did -- and providing you have *something else* (eg, the video) doing its memory access only during the clock phase that the 6502 doesn't use for memory access. It is the clock edges that trigger the 6502 to perform the memory access. > Question #2: > > If someone writes "pipelining" and encloses it within quotes does that > indicate to you that the term is being used, well, advisably? > > Answer: Visit groups.google.com and search for "pipelining" and 6502 (or > related processor). [...] > =====excerpt 3======================= > > The 6502 _IS_ pipelined, but in ways that are not very dramatic or even > obvious > unless you look at the CPU's internal operation in detail. Rockwell touted > the > pipelining in their 6502 user's guide years ago, it is essentially this: > > When you do a ADC of something, the last cycle of the instruction is when > the > actual data byte is read in, right? Immediately after that the next opcode > is > read so the next instruction has started, right? So when did the 6502 add? > > It added while the next opcode was being read. The accumulator does not > actually hold the new value until sometime during the second half (forget > exactly where) of the opcode cycle of the next instruction. > > That's pipelining. It saves you a cycle on every instruction that does an > ALU > operation. It may not be as spectacular as what's being done on the monster > RISCs these days but it is essentially pipelining. Yes, but only on a small number of the instructions. I'm sure other microprocessors of the day did that, Rockwell marketing not withstanding. > I'd say you got me on the "one cycle per instruction" but you jumped the > gun on the pipelining issue. OK? Well, maybe, but the 6502 is not basically a pipelined processor, in the sense that only a few instructions do anything close to pipelining, and not even all the intructions that use the ALU do so. -- Pete Peter Turnbull Network Manager University of York

23 years, 2 months

PACEMIPPS?

by rigdonj＠cfl.rr.com

Can anyone tell me exactly what a PACEMIPS PIMM - 33SG144C is? It's made by Performance Semiconductor but it's not listed on their (POOR!) website. I THINK it might be an R33000 embedded processor but I'm not sure. Joe

23 years, 2 months

Micom 2000 ?

by rigdonj＠cfl.rr.com

Lawrence, I found an old message from you in the CC archives while I was searching for info on the Micom 2000. In the message you said that you have a Micom 2000. Can you tell me what kind of disks it uses? I know that they're hard sectored 8" SSDD floppies but I don't know how many sectors they use. I picked up a case of sealed boxs of 8" floppy disks today at a hamfest and the case and boxs say that they're for the Micom 2000. Joe

23 years, 2 months

CCS 2422 Floppy Disk Controller

by classiccmp＠vintage-computer.com

23 years, 2 months

WANTED: RA7x Enclosure/Operator Ctrl. Panel

by jwillis＠arielusa.com

As I understand it, the drives won't spin up without the panel. I currently have full technical documentation for pretty much every DEC hard drive EXCEPT the RA70. One of my bosses was a field service engineer for DEC for 15 years, and the other worked for 22 years as the senior district representative for New Mexico, West Texas, Colorado, Utah, Arizona, and Nevada and was a storage subsystems specialist. They both agree that you need the control panel. They also both agree that I'm nuts for caring. -----Original Message----- From: Ethan Dicks Sent: Sat 2/8/2003 7:21 AM To: cctalk(a)classiccmp.org Cc: Subject: Re: WANTED: RA7x Enclosure/Operator Ctrl. Panel --- John Willis <jwillis(a)arielusa.com> wrote: > Wanted: RA7x Enclosure/Operator Ctrl. Panel Are these things common/rare? Absolutely required or are they just very nice to have? I have a couple of RA70 drives I got in a box with some KDA50s. Was going to put them in my BA123 with a KA630 processor. Haven't had the chance - still using a pair of RD54s. So... has anyone tried to put RA7X drives in a CPU (not disk) enclosure? If I'm hosed, then I guess I'm in the market for a drive enclosure, too (unless there's some way to hack up an old AT-style tower case...) -ethan [demime 1.01a removed an attachment of type application/ms-tnef which had a name of winmail.dat]

23 years, 2 months

TTY ASR-33 Platen?

by grg＠umn.edu

I have been blessed with *two* Teletype ASR-33's. Apart from a minor cleaning, they are going to be just fine. EXCEPT the rubber platens are as hard as Chinese arithmetic! In case you havent experienced this, if the platen gets hard, the printer doesnt print well-- the typehead kinda bounces off the paper and doesnt leave a clean dark mark. I've tried the usual remedies-- acetone cleans them up, but they're still rock hard. I need some suggestions! Should I try ArmorAll (known to soften rubber, given time), "Platen cleaner", "belt dressing", "french dressing", or what? Note that I don't need to clean or make it "grippier", it needs to be softened, a lot. Regards, George

23 years, 2 months

MicroVAX 3800 Power Cable

by pete＠dunnington.u-net.com

On Feb 7, 23:21, Tony Duell wrote: > > On Feb 6, 22:33, Tony Duell wrote: > > > > > I don't see how you can do a proper test without a visual inspection > > of > > > the connections... And I've yet to see a moulded connector that > > provides > > > a proper strain-relief for the cable. > > > > A good PAT tester will check at a sensible current (though admittedly a > > lot only check earth continuity at a proper current). As for strain > > I've never met a PAT tester that tests the current-carrying conductors at > a significant current, mainly because there's no easy way to do this > without dismantling the unit under test (if the cable is fixed) -- the > maximum current you could pass would be the normal operating current of > the unit (by simply applying mains to it), which is not enough. Even then > you couldn't measure the voltage drop across one of the conductors. A proper PAT tester to current standards has a socket for each end of an IEC cable, and each cable is supposed to be individually tested with both ends plugged in to the tester. > > releif, well you're not supposed to swing the equipment by the power > > cable, Tony! > > True, but equally I don't expect the outer covering of the cable to pull > out of the moulded connector in normal use exposing the single-insulated > wires inside. Which has happened to many moulded cables round here. I've only seen one do that -- and it was an instant candidate for the wirecutters at both ends. A proper visual inspection is supposed to be the first part of the PAT. > I assume you'd fail a rewirable plug with the cord grip missing/not used > on an electrical safety test. I certainly would. Yes. The first thing I do with any multiblock is take it apart to see how the ends are wired -- the cheap ones are usually in a condition where I feel compelled to re-do the job. -- Pete Peter Turnbull Network Manager University of York

23 years, 2 months

Tandy 1400 HD

by debann17＠yahoo.com

My uncle is lettingme re-set up his old tandy 1400 hd. The battery and everythign appears to be working fine. However, MS-Dos is not loading from the harddrive or from disk. Any suggestions on what cold be wrong? Thank you debann17

23 years, 2 months

Kaypro II available.

by aje＠technet2000.com.au

I have two Kaypro II that I have owned from new. Both are upgraded to run at higher clock speeds and one has a cooling fan fitted. One has the PC8 ROM There is a complete set of the bundled distribution software (Select, Perfect Writer etc) with manuals, including that really first class ground breaking program SBasic, and other programs that I wrote in SBasic including multi variable non linear regression analysis. Also Unidos and etc which allows the floppy drives to emulate those of other machines. I used one of these machines to run the first simulation of the CSIRO Sydney to Melbourne high speed railway. What price might one expect for such a a machine?. Alan Emmerson Brisbane QLD Australia

23 years, 2 months

Grundy Newbrain fix

by toring＠inet.uni2.dk

Hi, I have a Grundy Newbrain, which wouldn't start, or if it started it would only show random chars in the display. I've found out what was wrong with the machine and if anyone needs help with fixing his (or hers) machine, I'll be able to point to the problem. As far as I can tell, this is a common problem with all these machines, and it only gets worse as time goes by. Regards, Torben Ring

23 years, 2 months

Qube

by Tcampbelluk＠aol.com

Just read some interesting articles of nostalgia on the Warner Qube site on Yahoo while researching for an article I'm doing over here (England). I was the first President of Warner Qube system in Pittsburgh which was the first fully blown QUBE system after the Columbus, and what an experience. I then went on to Milwaukee and Brooklyn,Queens. If I can find any of my old info and if you are interested I will dig it out. ( I went on to help develop 2 of the largest U.K. cable/telephone systems for Comcast as Managing Director of Birmingham England Cable and Comcast Teesside (England). In each case we supplied cable and telephony service to more resident than the normal provider (British Telecoms) Hope this may be of help, if only historically. Ted Campbell

23 years, 2 months

Looking for source of MFM or RLL drives

by kelly＠catcorner.org

Yes, the OS allows entering of drive geometry. Actually only supports MFM up to 70Meg. RLL drives will of course work, just not to RLL capacity. I'm looking for the largest drives I can find. From: Ethan Dicks --- Kelly Leavitt <CCTalk(a)catcorner.org> wrote: > Any good sources of MFM or RLL drives. This would be for a Tandy 6000 > running Xenix. > > I'm looking for 70 Meg or higher MFM (110 RLL capacity). Hmm... those aren't so common (in the DEC world, there are two choices - the RD53 (Miniscribe 1325) and the RD54 (Maxtor XT2190). I take it you aren't constrained by a narrow set of expected geometries? (i.e. - you have a running system and/or the install procedure asks you about the drive rather than assuming?) -ethan

23 years, 2 months

10Base-FL

by pete＠dunnington.u-net.com

On Feb 5, 5:38, vance(a)neurotica.com wrote: > I'm about to put some 10Base-FL in and I was wondering if someone could > tell me what kind of fiber I should be looking for? Is it 50/125 MMF like > GigE? Or is it 62.5/125 MMF like FDDI? It will work fine with either. In theory, you get slightly higher coupling losses with 50/125 but can run slightly longer lengths; in practice it makes little difference. My advice is to stick to one kind or the other for everything. York Uni has always used 50/125 for everything (from the original FDDI and FOIRL through ATM and now 100baseFX and 1000baseSX) -- and we're smiling now that it's come back into vogue. BTW, stick to ST connectors where you can. SMAs suck big time, and couplers for STs are expensive. -- Pete Peter Turnbull Network Manager University of York

23 years, 2 months

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb