test-drb April 2007

test-drb@ccmp.vtda.org

257 participants
560 discussions

by rcini＠optonline.net

All: In my research on this Hawthorne SBC I got (I contributed the disk images to Dave?s efforts), I discovered that it was covered in various forms in The Computer Journal (TCJ). I have many issues in the series but not all. So, I was wondering if anyone had the complete series and whether it was worth scanning and posting. Rich -- Rich Cini Collector of Classic Computers Build Master and lead engineer, Altair32 Emulator http://www.altair32.com http://highgate.comm.sfu.ca/~rcini/classiccmp

17 years, 9 months

DC-600/300XL tape cart observation

by aek＠bitsavers.org

> I'm assuming that a couple of hours of heating the base plate to > about 130F (about 55C) will do as much good as anything will. There was a posting in the HP tape thread about using a lamp to heat the tensioning belt here within the past six months. Can't find it right now, though. I've observed the same thing with blue-labeled DC300s and 450s

17 years, 9 months

Hand-rolling a CP/M machine

by ajp166＠bellatlantic.net

> >Subject: Re: Hand-rolling a CP/M machine > From: "Ethan Dicks" <ethan.dicks at gmail.com> > Date: Wed, 25 Apr 2007 14:40:08 -0400 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >On 4/25/07, woodelf <bfranchuk at jetnet.ab.ca> wrote: >> >> You can copy the screen logic for TRS80 as that is a basic 64x16 as well. >> > Good thing to keep in mind. >> >> Well if anybody is doing VDM-1's the big problem is that you can't find >> the Character ROM any more. I like the idea of TTL display like VDM-1 >> but since this is not the late 70's a 80x24 screen is reasonable >> and the data out is a simple VGA format, since the monitors are easy to >> come by. > >As in the old Chargen ROMs like on this board? > >http://www.classiccmp.org/dunfield/d/h/tvt.jpg > >(I have one that I bought new and has yet to be attached to a KIM-1). > >With as fast as CMOS ROMs are today, why not use a 27C64 and burn your >own charset to it? It's not tough to do, but is there a technical >reason it wouldn't work? It works very well and it's easy to find a pattern like 2513 (5x7) or a 6674 (7x9) and burn an Eprom. Compared to the parts of that day even 2716 is both big enough and plenty fast. I like to use 27C64s as I have a bunch of pulls and it's no big deal building up a pattern as a copy or custom. FYI: to do it by hand all one needs is a sheet or a few of grid paper and a #2 graphite thingie. The order you enter the data is row for the low address lines (usualy 4 address lines) and the high address lines are the ascii value (0-127) that corosponds with the char. Allison

17 years, 9 months

ebay user dagwyn

by jwest＠classiccmp.org

Isn't ebay user "dagwyn" on the list? If so, please email me! Jay West

17 years, 9 months

Hand-rolling a CP/M machine

by ajp166＠bellatlantic.net

> >Subject: Re: Hand-rolling a CP/M machine > From: "Chuck Guzis" <cclist at sydex.com> > Date: Wed, 25 Apr 2007 11:49:49 -0700 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >On 25 Apr 2007 at 13:24, woodelf wrote: > >> Well if anybody is doing VDM-1's the big problem is that you can't find >> the Character ROM any more. I like the idea of TTL display like VDM-1 >> but since this is not the late 70's a 80x24 screen is reasonable >> and the data out is a simple VGA format, since the monitors are easy to >> come by. > >At the expense of getting booed off the topic, if you need simple >80x24 and are using something like an 8085, the 8275/8276 CRT >controller with an 8257 DMA controller (in auto-initialize mode) >doesn't take a lot of extra glue. The gotcha is that "special >effects" like bolding and underlining take up space on the display >(Doesn't the Wyse 50 do that?). There is a "transparent" mode, but >management of the screen buffer becomes a real headache. I've never >tried to interface an 8257 to a Z80, so I don't know if the timing >works there. Perfectly reasonable, though at first it was a simple system. The Z80 and 8257 (or 8237) coexist fairly well. There are some signal differences for the glue TTL but it works. Back in the day it was also popular to do that becase 8257 was cheaper and faster then Z80 DMA and didn't have to be clocked synchronous like the Z80 DMA. Allison

17 years, 9 months

Reporter in south Florida wants to talk to computer collector in same

by sellam＠vintagetech.com

See below. Please reply to Jamie direckly. -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ] ---------- Forwarded message ---------- Date: Tue, 24 Apr 2007 15:04:51 -0500 From: "Malernee, Jamie" <JMalernee at sun-sentinel.com> To: vcf at vintage.org Subject: florida members? Hi, I'm a writer with the South Florida Sun-Sentinel, working on an article about local people who collect vintage computers as a hobby/passion. Do you have any members in the Florida area, or more specifically the South Florida area, who I might be able to contact for my article? Many thanks, Jamie Malernee Staff Writer South Florida Sun-Sentinel (954) 356-4849 200 E. Las Olas Blvd. Fort Lauderdale, FL 33301

17 years, 9 months

Fw: Reporter in south Florida wants to talk to computer collectorin same

by jrkeys＠concentric.net

----- Original Message ----- From: "Keys" <jrkeys at concentric.net> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Sent: Wednesday, April 25, 2007 6:20 PM Subject: Re: Reporter in south Florida wants to talk to computer collectorin same > > ----- Original Message ----- > From: "Jay West" <jwest at classiccmp.org> > To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk at classiccmp.org> > Sent: Wednesday, April 25, 2007 7:27 AM > Subject: Re: Reporter in south Florida wants to talk to computer > collectorin same > > >> Sellam wrote.... >>> See below. Please reply to Jamie direckly. >> >> This is the same one that contacted me two days ago and that I posted to >> the list yesterday. Looks like the same reporter contacted Sellam the day >> after me. I wasn't going to post her phone number to the list but... The >> contact info is all the same, so to those who responded to my post >> already - contact her directly. >> >> Jay West >> > Anyone have the first post I missed it. Thanks JK

17 years, 9 months

Small World

by grant＠stockly.com

Forrest M. Mims III was one of the founders of MITS in 1969. He developed various model rocketry kits and left MITS a year or two later. MITS later on contracted with him to write the Altair Operators Manual in exchange for an Altair computer. That Altair has been on display at the Smithsonian for over 17 years. He later on wrote a book called "Getting Started in Electronics" for RadioShack which was given to me in 1997. This book "got me started in electronics" and led me to eventually reproduce the Altair. So last week I received an unsolicited e-mail from Mims congratulating me on the work. : ) I'm probably a "youngster" compared to many here, but anyone else have an experience like this? Meet someone from the past through unrelated projects that all tie togther? http://www.sunandsky.org/MITS_History.php http://www.sunandsky.org/ http://www.forrestmims.org/ http://www.forrestmims.com/ Grant

17 years, 9 months

NEED: Hardware or software emulator for the TMP68301

by alexandre-listas＠e-secure.com.br

Dear friends, Anyone knows where can I find a hardware or software emulator for the TMP68301 microcontroller from Texas? I want to do some messing with an old processor board. Thanks Alexandre Souza

17 years, 9 months

Lack of 8-bit threads (was Re: Linux question)

by wdg3rd＠comcast.net

-------------- Original message ---------------------- From: cctalk-request at classiccmp.org > 3. Re: Lack of 8-bit threads (was Re: Linux question) (Chuck Guzis) > Message: 3 > Date: Sun, 22 Apr 2007 08:50:00 -0700 > From: "Chuck Guzis" <cclist at sydex.com> > Subject: Re: Lack of 8-bit threads (was Re: Linux question) > One other fairly popular "nearly compatible" that I recall is the > Mitsubishi PC. Like the Convergent-designed 6300 It was a headache > for a lot of applications. Not really inferior to the 5150, but > different enough to be frustrating. The 6300 (and 6300 Plus) were designed and built by Olivetti, probably by the same engineers who used to keep Mussolini's trains running on time. Their DB-25 video connector is the only reliable way ever discovered to break a Radio Shack Daisy Wheel Printer II (aside from tossing the beast into a smelter). Convergent did the 7300 and 3B1 Unix PCs (vastly superior machines in my arrogant opinion, but I'm partial to just about any MC68k series systems that didn't come from Cupertino). -- Ward Griffiths wdg3rd at comcast.net The reason folks don't think of installing Windows as a painful experience is roughly the same reason men don't think of childbirth as a painful experience. Mike, http://www.theregister.co.uk/2007/03/30/letters_3003/

17 years, 9 months

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test-drb April 2007