Re: General public machines (Was: Altair 8800 name Was: Re: Altair 680 Expansion Boards?

@Grumpy Old Fred I knew my last missive would provoke at least one or two interesting (if not informative) responses. Yours was no exception, and I thank you for it. For one, I hadn't known that CP/M was written originally to the 8080.. I'd always assumed it originated on the Z80. And I don't

Re: General public machines (Was: Altair 8800 name Was: Re: Altair 680 Expansion Boards?

I’ll chime in on the Z80 preference, since I was there at the time. In the very early 1980s, when I was about 15, my father decided to buy a home computer. (Before that, he had a TI Silent 700 that dialed up to a Univac mainframe.) I remember him doing hours of research comparing the Apple II,

Re: General public machines (Was: Altair 8800 name Was: Re: Altair 680 Expansion Boards?

NO source is completely reliable. http://jeremyreimer.com/m-item.lsp?i=137 http://jeremyreimer.com/uploads/notes-on-sources.txt He does provide some information on his sources. When we talk about sales, are we talking about UNITS, or about dollars? (an important distinction for such as the

Re: ADM-3A Lower case ROM issue

>From the ADM3A Maintenance Manual, page 6-11: The two character generator ROMs are rather straightforward. The upper case > ROM is a standard masked part (2513) but the lower case ROM is a custom > masked part. The one unusual thing about this is that all of the address > lines into the lower

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

On Thu, Dec 22, 2016 at 7:01 PM, drlegendre . wrote: > The Z80 also showed up in the Osborne, Kaypro and TRS-80 models.. mostly > due to the fact that CP/M was written to it. > Use of the Z80 in the mainstream TRS-80 models (1 and III) had little or nothing to do with

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

"The Z80 had more players and more names than all the rest" And yet it was essentially a bit-player in the days of the 'home computer' revolution - at least in the US. CBM, Apple, Atari - the three big names in home computers, all went with the 6502 family. And perhaps even more importantly, so

General public machines (Was: Altair 8800 name Was: Re: Altair 680 Expansion Boards?

We all hang out with people who are smart enough to see things the same way that we do. Accordingly, our choices in computers, cars, cellphone providers always look to us like the MAJORITY. They are the BEST, and certainly the MOST POPULAR [among everybody that WE hang out with], but not

Re: PDP-6s at MIT

> From: Adrian Graham > I was born 10 years too late to see it all as it grew. ... these early > years are fascinating to me. Well, you _can_ still experience ITS! It runs under a number of PDP-10 simulators (and there used to be an 'open-access' ITS system on the 'net at

Re: PDP-6s at MIT

On 23/12/2016 00:00, "Noel Chiappa" wrote: >> 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

Re: PDP-6s at MIT

> 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

Re: PDP-6s at MIT

> Did the original KA10 have XCT too? XCT is present in all PDP-10 processors. 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. > Noel --Johnny

Re: PDP-6s at MIT

> AI memo 238: ITS Status Report, April 1972: >> Actually the Project MAC Dynamic Modelling Group uses a non-paged >> early offshoot of ITS on their PDP-10. > So it seems DM kept using the non-paged version of ITS, probably like > what their PDP-6 did. No, their KA10 had a

Re: PDP-6s at MIT

AI memo 161A: ITS 1.5 Reference Manual, July 1969: > An .OPEN on device USR with a second file name of "PDP10" may be made, > in all the modes allowed for regular procedures, to access the memory > of the PDP-10. So at this time, the AI PDP-6 was still the primary CPU. AI memo 238: ITS Status

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

On 12/21/2016 07:06 PM, Sam O'nella wrote: > On Wed, Dec 21, 2016 at 5:54 PM, j...@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

Re: Mystery 8085-related IC identification needed please

On 21/12/2016 19:37, "Brent Hilpert" wrote: > On 2016-Dec-17, at 10:34 AM, Adrian Graham wrote: >> One problem I have is that I've already found a few chips with dead outputs >> so I've no idea if these will be any different. The pinouts I have match the >> LS92 since pins

Re: Motorola MC14081B

On 21/12/2016 03:23, "allison" wrote: >> If one of the other outputs is driving a CMOS device the output may >> not go high enough to satisfy it, however I would expect the reset >> input on the 8085A to be TTL compatible. > The 8085 reset input is not TTL, its schmidt

Re: Motorola MC14081B

On 21/12/2016 00:58, "Paul Berger" wrote: > On 2016-12-20 8:50 PM, Adrian Graham wrote: >> Evening folks, >> >> (it's evening here) >> >> Typically for troubleshooting around $FESTIVAL I find a more-than-likely >> dead MC14081B (CMOS quad dual-input AND gates) just as UK

Re: Late 90s Macintosh systems available to So Cal

On 12/22/2016 2:10 AM, Steven Stengel wrote: There's maybe hundreds of floppys and CDs - all included at one low low price. $0.00 Wow ... K-tell records to K-tell software. Ben.

RE: ADM-3A Lower case ROM issue

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" Take a look at the silk screen on the board - ISTR there's another chip that needs

Re: Wanted Dead or Alive: Tadpole N40

Forgot to add, in addition to purchasing at what price you name, I will throw in a fully functional RDI PowerLite 1024x768 Sun4M laptop with two internal 2.5" hard drives. Your N40 doesn't even have to work. On Thu, Dec 22, 2016 at 2:04 AM, Ian Finder wrote: > Been having

Wanted Dead or Alive: Tadpole N40

Been having a bd month for hardware longevity. Lots of systems have died in 2016... A miserable year. Just took my only two Tadpole N40s out of cold storage and both are having some serious issues, stopping at 260 post code, no video, no status LCD, etc. If I had one more system, I'm sure I

Re: Late 90s Macintosh systems available to So Cal

There's maybe hundreds of floppys and CDs - all included at one low low price. $0.00 > On Dec 21, 2016, at 5:07 PM, Brendan Shanks wrote: > > Hi, I’m local (work in Irvine near the split). I’d be interested in the > PowerBooks, and maybe some software. What kind of