Re: XT/370 microcode

2018-03-16 Thread emanuel stiebler via cctalk
On 2018-03-15 18:35, Robert Armstrong via cctalk wrote: >> You might look up Nick Tredennick's book "Microprocessor Logic Design: >> The Flowchart Method" which is sold at Amazon for an obscene price > > FWIW, there are several copies on Abe Books ranging in price from "only" > $800 (a

RE: XT/370 microcode

2018-03-15 Thread Robert Armstrong via cctalk
>You might look up Nick Tredennick's book "Microprocessor Logic Design: >The Flowchart Method" which is sold at Amazon for an obscene price FWIW, there are several copies on Abe Books ranging in price from "only" $800 (a steal!) to almost $1200. I'd love to read it, but that's ludicrous.

Re: XT/370 microcode

2018-03-15 Thread Camiel Vanderhoeven via cctalk
On 3/15/18, 9:29 AM, "cctech on behalf of Veit, Holger via cctech" wrote: You might look up Nick Tredennick's book "Microprocessor Logic Design: The Flowchart Method" which is sold at Amazon for an obscene price - but

Re: XT/370 microcode

2018-03-15 Thread emanuel stiebler via cctalk
On 2018-03-15 09:29, Veit, Holger via cctalk wrote: > You might look up Nick Tredennick's book "Microprocessor Logic Design: > The Flowchart Method" which is sold at Amazon for an obscene price - but > maybe some university library has a copy. It's focus is on a methodology > for designing

Re: XT/370 microcode

2018-03-15 Thread Veit, Holger via cctalk
n... http://www.cpushack.com/2013/03/22/cpu-of-the-day-ibm-micro-370/ seems to have some names.. Dave -Original Message- From: cctalk <cctalk-boun...@classiccmp.org> On Behalf Of Lars Brinkhoff via cctalk Sent: 12 March 2018 07:02 To: cctalk@classiccmp.org Subject: XT/370 microcode Does s

Re: XT/370 microcode

2018-03-13 Thread Steve Malikoff via cctalk
ken said >>> I am not at liberty to post the document. >> >>This? > ... >>Also: > ... >>If so, it might be this: > ... > > There's a difference between "I am not at liberty..." and "what anyone > can google...". The Wayback Machine has it on archive.org

Re: XT/370 microcode

2018-03-13 Thread Ken Seefried via cctalk
On Tue, Mar 13, 2018 at 6:40 PM, Fred Cisin wrote: > On Tue, 13 Mar 2018, Ken Seefried via cctalk wrote: I am not at liberty to post the document. >>> >>> This? >> >> ... >>> >>> Also: >> >> ... >>> >>> If so, it might be this: >> >> ... >> There's a difference

Re: XT/370 microcode

2018-03-13 Thread Fred Cisin via cctalk
On Tue, 13 Mar 2018, Ken Seefried via cctalk wrote: I am not at liberty to post the document. This? ... Also: ... If so, it might be this: ... There's a difference between "I am not at liberty..." and "what anyone can google...". There do exist situations where somebody is NOT at liberty

Re: XT/370 microcode

2018-03-13 Thread Ken Seefried via cctalk
>> I am not at liberty to post the document. > >This? ... >Also: ... >If so, it might be this: ... There's a difference between "I am not at liberty..." and "what anyone can google...".

RE: XT/370 microcode

2018-03-12 Thread Paul Birkel via cctalk
-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

Re: XT/370 microcode

2018-03-12 Thread Liam Proven via cctalk
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

2018-03-12 Thread Paul Berger via cctalk
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: XT/370 microcode

2018-03-12 Thread Guy Sotomayor Jr via cctalk
> 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

2018-03-12 Thread Eric Smith via cctalk
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

2018-03-12 Thread emanuel stiebler via cctalk
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

2018-03-12 Thread emanuel stiebler via cctalk
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

2018-03-12 Thread Dave Wade via cctalk
Some of the code is now on bitsavers.. Dave From: Eric Smith <space...@gmail.com> Sent: 12 March 2018 14:41 To: Dave Wade <dave.g4...@gmail.com>; General Discussion: On-Topic and Off-Topic Posts <cctalk@classiccmp.org> Cc: Lars Brinkhoff <l...@nocrew.org> Subje

Re: XT/370 microcode

2018-03-12 Thread Eric Smith via cctalk
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

Re: XT/370 microcode

2018-03-12 Thread Eric Smith via cctalk
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

2018-03-12 Thread Lars Brinkhoff via cctalk
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.

RE: XT/370 microcode

2018-03-12 Thread Dave Wade via cctalk
> -Original Message- > From: cctalk <cctalk-boun...@classiccmp.org> On Behalf Of Lars Brinkhoff > via cctalk > Sent: 12 March 2018 07:02 > To: cctalk@classiccmp.org > Subject: XT/370 microcode > > Does someone have good connections with people inside IBM?

XT/370 microcode

2018-03-12 Thread Lars Brinkhoff via cctalk
Does someone have good connections with people inside IBM? I'd like to ask about 68000 microcode for the XT/370 product.