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101090 discussions

eBay: MEMOREX 3693-2 & 3690-2 Disc Drive Mainframe IBM 3370-2 VINTAGE

by steven＠malikoff.com

eBay: MEMOREX 3693-2 & 3690-2 Disc Drive Mainframe IBM 3370-2 VINTAGE No connection to the seller, but they mention it will be scrapped if no takers. $150 Buy it now. https://www.ebay.com.au/itm/MEMOREX-3693-2-3690-2-Disc-Drive-Mainframe-IBM-… or eBay item number: 272983151498 Steve.

8 years, 9 months

BT139-600G Triac Equivalent

by robert.jarratt＠ntlworld.com

I have a suspicion that this component may be faulty on the input side of my H7826 PSU. A little tester I have does not recognise it, it is possible that the currents it uses are too low for this particular triac, but I am not sure. There are new ones on ebay, but I am not sure if I can trust ebay sellers to have genuine parts. So I would like to identify a suitable replacement. I have found a few suggestions for replacements, but looking at the datasheets many seem to have a lower peak gate power then the BT139. I am not sure what the critical parameters are, so I don't know how to choose a replacement. Can anyone suggest a good replacement for this part? Thanks Rob

8 years, 9 months

RL02 weirdness

by aaron＠aaronsplace.co.uk

Now that I have my RX02 drive working I have started to take a look at the RL02 drives again. I hooked a scope up to the sector transducer and sector timing test points, and they look nicely aligned. So I moved on. Then I hooked up the scope to the TP1, TP2 and the sector timing TP and compared it to the output in the RL02 tech manual. S1 was fine but S2 was offset in the wrong direction (probably need to see page 3-8 in the manual to understand). I had a look at where the heads are connected to at up was connected to down and down was connected to up. Without understanding the consequences I switched these and loaded a pack. Unfortunately I heard a horrible sound and I now have a thin black ring on the bottom side of my platter, which I am very upset about. :( I unloaded very quickly but I think the damage is done. Why would the heads be installed this way? and why did it destroy my platter when they are connected "correctly"? Does anyone understand what might have happened? Thanks, and sorry for destroying a pack :( Aaron.

8 years, 9 months

Help with RSX/PDP11

by jcwelch＠hal-pc.org

It is time to ask for help.? I have forgotton more than I ever knew about using RSX.? Anyway, using the wonderful PDP11GUI I have imaged an RL02 pack to my PC.? I have downloaded a running RSX11m image. I want to look at my imaged disk to see how it looks. Using SIMH I did the following commands: ============================================ PDP-11 simulator V3.8-2 (JH stdio telnet) sim> set cpu 11/93, 4M Disabling CR Disabling RK Disabling HK Disabling TM sim> set cpu idle sim> set rq0 rd54 sim> attach rq0 rsx11mplus_4_6_bl87.dsk sim> set rl0 rl02 sim> attach rl0 RSX11-bu.rl02 sim> b rl0 SAV -- SOFTWARE CONFIGURED FOR ENABLE HARDWARE WHICH DOES NOT RESPOND.? HALTED. HALT instruction, PC: 126272 (BR 126270) sim> ============================================ So then I try: ============================================ sim> b rq0 RSX-11M-PLUS V4.6? BL87?? 2044.KW? System:"RSXMPL" >RED DU:=SY: >RED DU:=LB: >RED DU:=SP: >MOU DU0:"RSX11MPBL87" >@DU:[1,2]STARTUP >;????????????????????? PLEASE NOTE > .... >QUE BAP0:/AS:BATCH >@ <EOF> > =============================================== I think that I should be something like use pip to do something like : pip [*,*]* /li or something, but I got into trouble real quick. Do I need to mount the RL02 for the system to see it? If I want to list the files on the RL02 image what command would I use? Any help appreciated. Sincerely, John Welch

8 years, 9 months

RL02 to PC image

by jnc＠mercury.lcs.mit.edu

> From: Jonathan (Systems Glitch) > the vtserver `rx` driver has a bug in it anyway where it continues > reading past the end of the media I'll be working with the RX driver for the standalone stuff soon on a project of my own, I'll look into this then. BTW, 'VTserver' refers to three pieces of software: - The actual server, which runs under Unix on the 'server' machine - A small bootstrap which downloads the main standalone program from the server - A driver for the standalone software which adds a device which can talk to the server over a serial line, as one of the devices for the standalone The standalone software is V7 code that existed before VTServer did, more on it here: http://gunkies.org/wiki/Installing_UNIX_Seventh_Edition and the RX driver is actually for that. Noel

8 years, 9 months

RX02 Difficulties

by jnc＠mercury.lcs.mit.edu

> My copy of of the V7 standalone stuff (which I got from the VTServer > directory) didn't include an RX driver. Where'd you manage to find one? So, thanks to a tip (thanks, Jerry! :-), the source has been found: https://github.com/chapmajs/vtserver/tree/master/pdpvtstand http://www.shiresoft.com/pdp-11/software/ For some reason, the TUHS Archive doesn't contain the later versions of VTServer: http://www.tuhs.org/Archive/Tools/Tapes/Vtserver/ and in those (unlike the earlier versions), the standalone source is in the same archive file as VTServer itself. Noel

8 years, 9 months

RX02 Difficulties

by aaron＠aaronsplace.co.uk

Hi everyone, I originally posted this on VCFed (which was new to me) but the moderation queue has had me waiting for about 3 days, so I thought I'd ask here as well, the usual of gurus. :) I was recently sent an RXV21 controller so I could test out my RX02 drive. When I power up the PDP-11 or reset the machine I get the nice clunking sound which I have been told is normal. I expect I wouldn't hear this if the ribbon cable was in the wrong way. To test, I tried to use VTserver to dump the contents of a disk, but it immediately threw an error. I soon realised there are two DIP switches on the logic board of the RX02 drive which had to be adjusted to work with the RXV21. So, I had some progress. Output of VTserver almost looked promising but then it hangs, as below: ]] Tape record n from device xx is written as xx(0,0,n) ]] Disk drive xx is written as xx(0,0,0) ]] ]] Enter name of input record/device: rx(0,0,0) ]] Enter name of output record/device: vt(0,0,1) ]] ]] Opened copy.out read-write ]] So, following some advice I booted via TU58em into XXDP and ran the diagnostics: ]] DR>STA ]] ]] CHANGE HW (L) ? N ]] ]] CHANGE SW (L) ? N ]] ]] CZRXFB0 SYS FTL ERR 00040 ON UNIT 00 TST 011 SUB 000 PC: 003476 ]] CSR BITS - LGC TST ]] AC LOW FATAL ERROR ]] REG ACTUAL=000000 ]] REG EXPECT=000000 ]] ]] POSSIBLE FAILING "FRU'S": ]] INTERFACE - M8029 ]] ]] UNIT#0 RXCSR=000000 RXESR=000000 CMD=000000 -> ]] ->NO PWR, CABLED BACKWARDS, STRAPPED RX01, PDP-8 ]] DROP UNIT#0 FROM TEST ]] ]] PASS ABRTD THS UNIT ]] CZRXFB0 SYS FTL ERR 00040 ON UNIT 01 TST 011 SUB 000 PC: 003476 ]] CSR BITS - LGC TST ]] AC LOW FATAL ERROR ]] REG ACTUAL=000000 ]] REG EXPECT=000000 ]] ]] POSSIBLE FAILING "FRU'S": ]] INTERFACE - M8029 ]] ]] UNIT#1 RXCSR=000000 RXESR=000000 CMD=000000 -> ]] ->NO PWR, CABLED BACKWARDS, STRAPPED RX01, PDP-8 ]] DROP UNIT#1 FROM TEST ]] ]] PASS ABRTD THS UNIT ]] CZRXFB0 EOP 1 ]] 2 TOTAL ERRS So, the possible errors according to XXDP: - Bad power - I get 25v, 5v and -5v. The motors are spinning, not convinced it is this? - Cable backwards - I don't think I'd be hearing that clunk. - Strapped RX01 - I don't know what this means - PDP8 - eh? If anyone has any suggestions it would be great to hear them. Thanks, Aaron.

8 years, 9 months

RL02 to PC image

by seefriek＠gmail.com

> Anyone know of a 40-pin UART with a FIFO? :) 16c550s are cheap as dirt. And you can stick a 16c850 or whatever the latest incarnation is to a PLCC to DIP adapter. > I've lately been doing the data transfer stuff using STM32F407 > development boards. Chuck really has the right answer here. UART chips aren't going to patch over that. KJ

8 years, 9 months

11/04 Project

by jnc＠mercury.lcs.mit.edu

> From: William Degnan > 1) the console rom does not go in any of the 4 bootstrap slots, these > should be empty for now. There is a special console rom slot. Just to clarify, by "slot", you don't mean 'backplane slot', you mean 'socket (on the card)', right? Also, note that the console/diagnostic ROM is a different size (bit-wise; I'm not sure about the physical package) from the bootstrap ROMs. > 6) possibly the only switch to worry about now is the power on auto > jump to console switch. I'd leave that, too, until we get the software console to run when started manually - at the moment, the ROM's not working, so that switch is irrelevant. Noel

8 years, 9 months

RX02 Difficulties

by jnc＠mercury.lcs.mit.edu

> From: Aaron Jackson > It was the disks after all. Well, I'm glad you got it working. Where'd you get a good floppy? Noel

8 years, 9 months

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