Re: AlphaServers

On Mon, Mar 12, 2018 at 9:25 PM, Benjamin Huntsman via cctalk wrote: > > I have an ES47 I got for a price I could stomach, but it's sans rail kit, > drinks power like it's going out of style, and can anchor a 40-ft yacht. > > Anyone out there do Alphas anymore? I have a 2

Re: AlphaServers

On Tue, 13 Mar 2018, Benjamin Huntsman via cctalk wrote: Anyone out there do Alphas anymore? Well my AS4100 is running OpenVMS even as we speak. I have an Alphastation 500 here doing nothing. I arranged for somebody to get two free DS20Es last year so, yes, I still do alphas. Intel? Don't

Re: AlphaServers

I have a Compaq XP1000/667 that’s my primary VMS system. I picked up a couple XP1000’s a little over a decade ago when they were affordable, as a replacement for my AlphaStation 433au. I need a new power supply for the /500. I think the days of hobbyist-friendly prices are largely gone.

AlphaServers

Place your wagers... How many more years do you think it'll take before decent, practical-sized Alphas, like the DS15, and to some degree, the DS10, will be obtainable at hobbyist-friendly prices? I have an ES47 I got for a price I could stomach, but it's sans rail kit, drinks power like

Re: GRI 771 Keyboard Info

Martin Eberhard got me the schematic for the GR 721, which is very similar -- I traced the pinout on the DB25 and it's correct for the 771. In case anyone else needs it: http://deramp.com/downloads/mfe_archive/030-Keyboards/George%20Risk/GR%20721%20Keyboard%20Schematic.JPG The 771 needs +5 and

RE: XT/370 microcode

-Original Message- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Paul Berger via cctalk Sent: Monday, March 12, 2018 1:41 PM To: Guy Sotomayor Jr via cctalk Subject: Re: XT/370 microcode The IBM Systems Journal article does not go into great detail but says that a

Re: XT/370 microcode

On 12 March 2018 at 18:41, Paul Berger via cctalk wrote: > I am not at liberty to post the document. This? http://ieeexplore.ieee.org/document/5387781/?reload=true Also: https://www.researchgate.net/publication/224102395_System370_capability_in_a_desktop_computer If

Re: XT/370 microcode

The IBM Systems Journal article does not go into great detail but says that a complex of three separate processors are used, a modified 68000 that executes "a large subset of 370 instructions", a standard 68000 to emulate the remainder odf the instructions and a modified 8087 to execute the

Re: GRI 771 Keyboard Info

What kind of parts does it have? If it is all ttl, you only need to connect 5 volts and ground. There will be a strobe, 7 or 8 bits of data and possible wires for repeat ( usually these go directly to the keyboards repeat switch, without logic. Older keyboards required a negative rail. This

Re: XT/370 microcode

> On Mar 12, 2018, at 9:57 AM, Eric Smith via cctalk > wrote: > > On Mon, Mar 12, 2018 at 10:54 AM, emanuel stiebler via cctalk < > cctalk@classiccmp.org> wrote: > >> On 2018-03-12 15:49, Eric Smith via cctalk wrote: >>> As the most obvious example of the impedance

Re: XT/370 microcode

On Mon, Mar 12, 2018 at 10:54 AM, emanuel stiebler via cctalk < cctalk@classiccmp.org> wrote: > On 2018-03-12 15:49, Eric Smith via cctalk wrote: > > As the most obvious example of the impedance mismatch between 370 > > architecture and 68000 microarchitecture, the 68000 is hardwired to have > >

Re: XT/370 microcode

On 2018-03-12 15:49, Eric Smith via cctalk wrote: > As the most obvious example of the impedance mismatch between 370 > architecture and 68000 microarchitecture, the 68000 is hardwired to have > eight each data and address registers, not sixteen GPRs, and microcode > can't easily paper over that.

Re: XT/370 microcode

On 2018-03-12 15:49, Eric Smith via cctalk wrote: > As the most obvious example of the impedance mismatch between 370 > architecture and 68000 microarchitecture, the 68000 is hardwired to have > eight each data and address registers, not sixteen GPRs, and microcode > can't easily paper over that.

Re: GRI 771 Keyboard Info

On 03/12/2018 07:44 AM, systems_glitch via cctalk wrote: > All, > > I'm looking for info on a George Risk 771 parallel ASCII keyboard. I've got > one but no documentation or existing cabling. I'd like to interface it to > my Poly-88. > > Thanks, > Jonathan > Wasn't there something about that

RE: XT/370 microcode

Some of the code is now on bitsavers.. Dave From: Eric Smith Sent: 12 March 2018 14:41 To: Dave Wade ; General Discussion: On-Topic and Off-Topic Posts Cc: Lars Brinkhoff Subject: Re: XT/370 microcode

Re: XT/370 microcode

As the most obvious example of the impedance mismatch between 370 architecture and 68000 microarchitecture, the 68000 is hardwired to have eight each data and address registers, not sixteen GPRs, and microcode can't easily paper over that. Similarly, the 8087 microarchitecture has hardwired

GRI 771 Keyboard Info

All, I'm looking for info on a George Risk 771 parallel ASCII keyboard. I've got one but no documentation or existing cabling. I'd like to interface it to my Poly-88. Thanks, Jonathan

Re: XT/370 microcode

On Mon, Mar 12, 2018, 05:13 Dave Wade via cctalk wrote: > . Wikipedia says there were/are > 2x68000 CPU's.. > One Motorola chip was the custom one, the other was normal (as indicated by mask code). There was also an Intel math co, presumably derived from 8087. I used to

Re: XT/370 microcode

Lars Brinkhoff wrote: > Does someone have good connections with people inside IBM? I'd like to > ask about 68000 microcode for the XT/370 product. Martin Ziskind says he has floppy disks with VM/PC, but no way to read them.

Texas Instruments Silent 703/707 print head anyone?

Hi, last weekend I cleaned and restored a TI Silent 703 printing terminal. A rather common type with its whopping 300 baud transfer rate - nevertheless a piece of history. It was easy to fix a broken trace on the keyboard PCB (corrosion) and to roughen the idler roller for better grip on the

RE: XT/370 microcode

I don't suppose any one left in IBM has any knowledge of this. Perhaps no one ever did and it was all done by Motorola. Wikipedia says there were/are 2x68000 CPU's.. .. I would ask on IBM Main... http://www.cpushack.com/2013/03/22/cpu-of-the-day-ibm-micro-370/ seems to have some names.. Dave

XT/370 microcode

Does someone have good connections with people inside IBM? I'd like to ask about 68000 microcode for the XT/370 product.