test-drb

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101090 discussions

OT: Please help - Neighbors home burned this Christmas eve

by drlegendre＠gmail.com

Please forgive this, list-members, I know it's way OT: https://www.gofundme.com/jeff-kris-kidder-xmas-eve-fire My super great neighbors across the street lost their home to fire this evening. =( These folks are the best of the best.. as the saying goes "Couldn't have happened a nicer guy!". Please spread it around as you feel is appropriate. Like most of us, we're still kind of in shock over it. I can only imagine how Jeff & Kris are.. thanks for your forbearance.

8 years, 4 months

Other SMS300/8X300/8X305 uses?

by spacewar＠gmail.com

Now that I have an 8X300 (etc.) disassembler, which I've used to disassemble the Western Digital WD1000 and WD1001 firmware, and the Zendex ZX-203 firmware, I've become curious as to what other products used the SMS300/8X300/8X305. Does anyone know of any? In the early to mid-1980s, the 8X300 was a good choice for hard disk controllers, because all instructions took 250ns, and a single instruction could read an I/O port or RAM location, shift and mask, and write another I/O port or RAM location. At the time, no MOS microprocessor was even close to that.

8 years, 4 months

ICL7611 op-amp (was: Motorola MC14081B)

by witchy＠binarydinosaurs.co.uk

Hi folks, Thanks for all the help so far, I've moved on quite a way but I still haven't managed to get my head around op-amps other than the basics. If I may trouble your experienced heads with a small circuit diagram: http://www.binarydinosaurs.co.uk/STCExecutelStartupCircuit.jpg This is the full circuit of all the things I've been posting recently, traced and drawn out as completely as I can manage. All the resistors and diodes have been tested out of circuit and are OK and I've just realised 3 of the resistors are labelled wrongly. R409 is 47k, R415 and R391 are 100k. IN- at the op-amp is 1.2V from the LM385ZB-1.2 which has pins 2/3 tied together. IN+ is 1.3V. V+ is 5.3V. The purple trace is RESET for the 8085, or should be. Initially the LM385Z had rotted away because of battery leakage so I was experimenting with diodes in series to try and get the IN- voltage down to 1.2V, and with two IN4148s (0.9V) the whole circuit sprang into life and I got RESET at the 8085. For two seconds, then it would cycle for two seconds. This maybe expected behaviour, I don't know. 3 diodes gave me 1.3V which produced nothing at the op-amp output, probably because there was no difference between IN+ and IN-? On a whim I managed to solder new legs onto the old LM385Z and it works, giving 1.2V at IN-, but the output is still only 0.2V. I don't mind admitting I'm stumped :) -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?

8 years, 4 months

Altair 8800 name Was: Re: Altair 680 Expansion Boards?

by barythrin＠gmail.com

On Wed, Dec 21, 2016 at 5:54 PM, js at cimmeri.com <js at cimmeri.com> wrote: > > > On 12/17/2016 1:23 PM, Stephen Pereira wrote: > >> I was (finally) lucky enough to acquire an Altair 680 back in November... >> > > Is there any logic to the naming of these Altairs? Wonder why it wasn't > "Altair 8080" and "Altair 6800". 8800 and 680 don't follow the same > pattern. > > ------ > > Had MITS made other Altairs... > > Altair 8800 = 8080 > 8850 = 8085 > 8860 = 8086 > 8880 = 8088 > 8286 = 80286 > 8386 = 80386 > 680 = 6800 > 680 = 6809 > 680 = 68000 > > ;-), > > - JS > ---------------------------- > lol, I would love to hear that too if anyone knows any stories behind the naming. Used to hurt my head to remember that it was an 8800 not an 8080. I know the fairly well published story about the name Altair but companies and their model numbers are always odd.

8 years, 4 months

PDP-6s at MIT

by jnc＠mercury.lcs.mit.edu

> From: Lars Brinkhoff > I have this on AI: >> the semi-original AI (that is, the KA-10 rather than the PDP-6) was >> .. was given to a bunch of hackers from Concourse Oh, right, now that you mention it, I very vaguely recall this. I'm not sure why I thought they had taken a KA too - I think I may have been confused by this email: Date: Fri, 16 Sep 88 00:16:04 EDT From: Peter Lothberg <ROLL at AI.AI.MIT.EDU> Subject: The "crack team", is dissasembling MX, for it's trip to Sweden To: INFO-ITS at AI.AI.MIT.EDU The crack team has begun to work; ... (As the system will not fill the container more than 40% or so, we vold like donations of other stuff, like Lisp-machines, AAA terminals, a IMP, Conection machines, retired 2060's etc, (I'm not joking...)) which does talk about taking other stuff. But I have this persistent memory that they took a KA - maybe I should try and get ahold of Peter and see? There is a later email: Date: 11-Nov-88 0:39:51 +0100 From: Peter_Lothberg <ROLL%SESTAK.BITNET at MITVMA.MIT.EDU> To: bug-its at ai.ai.mit.edu Subject: The container and MX Arrived to Stockholm and we unpacked the container on wendsday. The container has, sure shaked, the cardboard paper that we put between the cabinets, has bloue spots..... But, everything was in the same position that we left it, so, hopfully it is not hurt by the transport, or the cold here. We have put the machine on several places, while we are waiting for our new machine room to be completed. which makes it sound like they only got the KL? It's also possibly I am mixing two memories, and remembering this: Date: Sat, 3 Oct 87 23:02:14 EDT From: Alan Bawden <ALAN at AI.AI.MIT.EDU> Subject: The operating system that wouldn't die! AAAAIIIIEEEEEE!!!!! To: INFO-ITS at AI.AI.MIT.EDU I thought I would take this opportunity to spread the word about something that I don't think has been very widely publicized. Some of you may recall that a while ago some fellows in Sweden contacted us about running ITS on various PDP-10's that they owned? Well, we mailed them a set of tapes for bringing up ITS on their 2020, which they were able to do without too much trouble .. That all happened over a year ago. Recently we learned that these guys have successfully -built- ITS paging hardware for their KA-10, and have ITS up and running there as well! Totally Amazing. Pretty astonishing accomplishment, that. Noel

8 years, 4 months

Transporting an LGP-30

by vintagecomputer＠bettercomputing.net

-------- Original message -------- From: william degnan <billdegnan at gmail.com> Date: 2016-12-24 3:35 AM (GMT-08:00) To: cctech <cctech at classiccmp.org> Subject: Re: Transporting an LGP-30 > Well, I think you guys have convinced me that a trip is in order. Better safe than sorry with a piece of equipment like this. > > Yep Chuck, this is the CA machine. I was surprised it never reared its head on classiccmp the past few days. -C Believe me, I for one was interested, and I was in contact with the seller.?? The expense and effort, as much as >I'd love to work on restoring >this, was too great to pull the trigger. I thought about it also. ?I would have liked to have brought it back to BC and kept it here in Canada. ?But I began to wonder how it had ended up with these guys and talking to them I had my doubts about the amount of care taken in moving it around. ?And I assumed freight would be insane anyway. ?

8 years, 4 months

Clone of 98228A ROM for 9825T information posted.

by phb.hfx＠gmail.com

I have posted a package of information and ROM images from my project to clone the 98228A ROM on the VintHPcom group at groups.io. Progress on laying out a PCB is going slowly as I have little experience and the learning curve for using Kicad to lay out a board seems pretty steep. Paul. Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the VintHPcom at groups.io group. *File:* 98228A.zip *Uploaded By:* Paul Berger *Description:* Package with information and ROM images from my project to clone the rare 98228A ROM that supports both 9885 and 9895 8" diskette drives. You can access this file at the URL: https://groups.io/g/VintHPcom/files/HP9825/98228A.zip Cheers, The Groups.io Team _._,_._,_ ------------------------------------------------------------------------

8 years, 4 months

Holiday wishes

by c.murray.mccullough＠gmail.com

?All I want for Christmas is? a PC diagram for my Coleco ADAM; with apologies to Don Gardner(1946). Wishing all the best of the holiday season and may 2017 bring all your computing classic dreams come true. Happy computing, Murray :)

8 years, 4 months

PDP-6s at MIT

by jnc＠mercury.lcs.mit.edu

> From: Johnny Eriksson > From the KI10 and onwards it includes PXCT, since these have the > concept of a previous context... > Given a pager for the KA10 PXCT would make sense there. It turns out the KA ITS machines have an instruction that does roughly the same thing, but it's different. Here's the relevant code fragment from SYSTEM;ITS >: IFN KA10P,[ SUBTTL STUFF PECULIAR TO KA-10 PROCESSOR ;;;PAGING BOX INSTRUCTIONS LPM=102000,, ;LOAD PG MEM STATE VECTOR DONT CLR ASSOC MEM LPMR= LPM 2, ;CLEAR ASSOC MEM AND LOAD SPM= LPM 1, ;STORE PG MEM STATE VECTOR LPMRI=LPM 6, ;LOAD PM, CLEAR ASSOC REG, AND CAUSE INTERRUPT EXPGNG==4 .SEE UPQUAN ;4 TO TURN ON EXEC PAGING XCTR=103000,, ;EXECUTE INSTRUCTION WITH MAPPING CONTROLLED BY AC FIELD ;VIOLATION CAUSES USER MEM PROTECT INTERRUPT UNLESS INHIBITED ;VIOLATION ALSO SKIPS BUT THIS IS OF NO CONSEQUENCE UNLESS ;INTERRUPT IS INHIBITED SINCE PC WILL BE RESET FROM OPC XCTRI= XCTR 4, ;XCTR WITH PAGE FAULT INHIBITED (SKIPS ON FAULT) ; AC FIELD VALUES FOR XCTR AND XCTRI XR==1 ;MAP READ MAIN OPERAND OF SIMPLE INSTRUCTION (MOVE, SKIPL, HLL) XW==2 ;MAP WRITE MAIN OPERAND OF SIMPLE INSTRUCTION (MOVEM) XRW==3 ;MAP READ/WRITE OPERAND OF SIMPLE INSTRUCTION (E.G. IORM) XBYTE==3 ;MAP BYTE DATA AND BYTE POINTER (ILDB, IDPB) XBR==1 ;MAP BLT READ XBW==2 ;MAP BLT WRITE XBRW==3 ;MAP BOTH OPERANDS OF BLT ;KA10 PAGING BOX GOES BY WHETHER IT'S A READ OR WRITE (OR RW) CYCLE ;KL10 PAGING BOX WORKS DIFFERENTLY (SEE BELOW) ;DO NOT USE MULTI-OPERAND INSTRUCTIONS (DMOVE, PUSH, ETC.) WITH XCTR The KL and KS are both different (although both use XCTR and XCTRI); the KL stuff is later down in that file; the special KS instructions are in KSHACK;KSDEFS > if anyone wants to look at them. Noel

8 years, 4 months

ADM-3A Lower case ROM issue

by shatle＠nfldinet.com

-------- Original Message -------- Subject: Re: ADM-3A Lower case ROM issue From: "Ian S. King" Date: Wed, December 14, 2016 1:30 am To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Take a look at the silk screen on the board - ISTR there's another chip that needs to be added, some simple TTL logic. I converted mine several years ago without problems - but that was with the original ROM. -- Ian S. King, MSIS, MSCS, Ph.D. Candidate -- Just as a follow-up - I got the two RAM ICs that were missing (2102 1K RAM), and installed those along with the lower-case ROM, and everything now works great. Thanks everyone for your expertise and tips! Steve

8 years, 4 months

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