Re: Int 13h buffer 64k boundaries

> On Apr 19, 2018, at 8:55 PM, Chuck Guzis via cctalk > wrote: > > On 04/19/2018 07:56 PM, Guy Sotomayor Jr wrote: > >> As to why IBM entered the PC market, the rumor was (at least at the time >> within IBM) was that T.J. Watson, Jr. was at an employee’s house and saw

Andromeda SCDC Qbus controller question

I just got one of these and wanted to configure it via the 10 pin RS232 port on the board. Is the port a standard DLV11-J type? I have one of those D-bit DLV11-J to DB25 adapters but not getting any response. Any info on the few jumpers on the board? Doug

Re: Int 13h buffer 64k boundaries

On 04/19/2018 07:56 PM, Guy Sotomayor Jr wrote: > As to why IBM entered the PC market, the rumor was (at least at the time > within IBM) was that T.J. Watson, Jr. was at an employee’s house and saw > an Apple II. He said that he wanted to have IBM branded computers in IBM > employees homes.

Re: Int 13h buffer 64k boundaries

> On Apr 19, 2018, at 4:16 PM, Chuck Guzis via cctalk > wrote: > > On 04/19/2018 12:14 PM, Fred Cisin via cctalk wrote: > >> I have no difficulty admitting that I didn't, and don't, have >> Chuck's level of experience and knowledge. My entire venture into >>

Re: Int 13h buffer 64k boundaries

On 04/19/2018 05:33 PM, Jim Brain via cctalk wrote: > Someday, the products and software designed and built by the folks in > this list will be judged by those who follow us.  Possibly the rest of > you have worked in industries where you were allowed to use new > solutions, you had ample time to

Re: Int 13h buffer 64k boundaries

On 4/19/2018 6:16 PM, Chuck Guzis via cctalk wrote: So, at the time, looking at the 5150, it was an overpriced primitive implementation using a 1970s CPU. Many people at the time thought it would be less popular than the 5100. While I won't argue the technical merits of your position, I feel

Re: Int 13h buffer 64k boundaries

I have no difficulty admitting that I didn't, and don't, have Chuck's level of experience and knowledge. My entire venture into microcomputers was a hobby that got out of hand. On Thu, 19 Apr 2018, Chuck Guzis via cctalk wrote: It's not so much expertise, but where you start your

Re: Int 13h buffer 64k boundaries

Chuck Guzis pointed out that the PC was built from 8 bit peripheral chips, which was where the 64KB problem came from. When I saw the design, I thought it was really cute how they were able to use one of the timer channels and one of the DMA channels to implement a DRAM refresh circuit almost

Re: new disassembler vs IDA (was Re: 8085 Dissasembly?)

> On Apr 19, 2018, at 9:19 AM, Eric Smith via cctalk > wrote: > > For the 1802, I've used a really crude disassembler written in C. The 1802 > instruction set isn't very complicated, so a disassembler for it isn't > either. It's been so many years since I actually

Re: Int 13h buffer 64k boundaries

On 04/19/2018 12:14 PM, Fred Cisin via cctalk wrote: > I have no difficulty admitting that I didn't, and don't, have > Chuck's level of experience and knowledge. My entire venture into > microcomputers was a hobby that got out of hand. It's not so much expertise, but where you start your

new disassembler vs IDA (was Re: 8085 Dissasembly?)

On Wed, Apr 18, 2018 at 8:17 PM, Mark J. Blair via cctech < cct...@classiccmp.org> wrote: > Some of the future reverse engineering projects I have on my to-do list > involve the CDP1802 processor, which IDA presently doesn't support. When I > get to them I'll have to decide whether to use

what happened to the dec thing with the butterfly discs never heard back I need it for museum thanks cindy    ed

what happened to the dec thing with the butterfly discs never heard back I need it for museum thanks cindy    ed

old schematics books

These have now been claimed. Thanks everybody! Sean I need an address please! Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 830-370-3239 cell sa...@elecplus.com AOL IM elcpls --- This email has been checked for viruses by Avast antivirus software.

Re: Intel HEX formats

On Thu, Apr 19, 2018 at 1:45 PM, Dennis Boone via cctalk < cctalk@classiccmp.org> wrote: > > Based on what I find in format83.c, this shouldn't be too much > > trouble, but I really want to know what "Intel HEX 83" is supposed to > > mean. > > The easily findable specification document for

Re: Intel HEX formats

> Based on what I find in format83.c, this shouldn't be too much > trouble, but I really want to know what "Intel HEX 83" is supposed to > mean. The easily findable specification document for "intel hex", which has intel branding and copyright, is revision A and dated 1988, so perhaps "83" is

Re: Speed now & then

On Wed, Apr 18, 2018 at 06:32:59PM -0600, ben via cctalk wrote: > On 4/18/2018 4:47 PM, Eric Smith via cctalk wrote: >> On Tue, Apr 17, 2018 at 8:18 PM, Fred Cisin via cctalk >> wrote: >>> thousands of movies and TV episodes will fit on a 2TB drive. I am anxiously >>>

Last call for free old manuals

I have many cases of SAMS facts schematics and other repair manuals for everything from stereos, tube TVs, ham radios, turntables, etc. Most apply to equip from the 60s and 70s or maybe a little earlier. Free to a good home or they go in the recycle bucket tomorrow. Cindy Croxton Electronics

Re: Int 13h buffer 64k boundaries

Yes, it was a "beginner" mistake to not already know that the DMA couldn't span a 64K boundary. It is obvious. Once you've already run into it. I have no difficulty admitting that I didn't, and don't, have Chuck's level of experience and knowledge. My entire venture into microcomputers was a

Intel HEX formats

I'm trying to understand various hex formats so I can add them as output options to minipro[1]. I went looking for existing code to convert binary to Intel hex and found repeated copies and references to "format83.c" by Erik Lindberg. It seems to do what I want, but I'm unclear what "Intel

Re: 8085 Dissasembly?

On 19 April 2018 at 17:37, Liam Proven wrote: > > I don't know when a word stops being new, but that one is a good 35 years old: > > https://en.wikipedia.org/wiki/Heisenbug (But saying that, I like it, too. Even as a rookie programmer around the time it was defined, in my

Re: 8085 Dissasembly?

On 19 April 2018 at 13:27, Noel Chiappa via cctalk wrote: > > From: Charles Anthony > > > discovered that changing the executable would change the behavior -- a > > heisenbug. > > Ooh, love that neologism. I don't know when a word stops being new, but that one

Re: TRS-80 bits

On 4/19/2018 2:54 AM, Wouter de Waal via cctech wrote: Hi all I have a TRS-80 Model 2000 B/W Graphics board and a TRS-80 Card Cage kit (upgrade model 12 to model 16B) Are either of these worth shipping from the antipodes to anyone? W Hmm, I guess it does indeed depend on shipping costs,

FYI: IBM System/34 available in Boston, MA

Just noticed this post on the Vintage Computer forum. I don't know a thing about it: http://www.vcfed.org/forum/showthread.php?63253-IBM-System-34-5340 --Chuck

Re: 8085 Dissasembly?

> From: Charles Anthony > discovered that changing the executable would change the behavior -- a > heisenbug. Ooh, love that neologism. Noel

TRS-80 bits

Hi all I have a TRS-80 Model 2000 B/W Graphics board and a TRS-80 Card Cage kit (upgrade model 12 to model 16B) Are either of these worth shipping from the antipodes to anyone? W

Absolute OpenBSD book

This is available for the cost of postage. https://photos.app.goo.gl/OpVKxtbXqKp2VPl52 Mark.