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TM 990/189 or PP189

by njoerd_de - 10/21/2008
Total messages in this thread: 3
Last Post: [ re:TM 990/189 or PP189 ] 10/21/2008
Hello to all, I get a TM 990/189 System from one of my friends. The interesting point is that the system is build in a black box. You can detach the cover from it. On the cove there are the letters PP189 and of course the Texas Instruments brand name. I searched in the internet to get more information about this system. I found some of the PCB (TM 990/189) itself but nothing about the box. Do anyone know more about it? Regards from Germany Andreas... [ read more ]

MITS 680b Memory Dump Listing

by billdeg - 10/14/2008
Total messages in this thread: 1
I found an article titled "Hexadecimal Memory Dump" bummed from Mark Borgerson code by Cal Rasmussen in my copy of Kilobaud from 11/1978. The program is written for a MITS 680b running MIKBUG. Program Listing... [ read more ]

Removing yellowing from plastics

by billdeg - 10/09/2008
Total messages in this thread: 1
This is a reprint from http://www.vintage-computer.com/vcforum, but I thought it worth mirroring here. To follow is an excellent synopsis on the subject, taken from a 200 record thread: - Part 2 (by "Merlin") "...The original thread is over 200 posts long now and getting to be a heavy read for some, so Lorne and I thought it was best that we start a new thread here, with a "Story So Far" summary, before we start more experiments. So, what has been discovered and learned so far? 1. We have learned that a magic concoction has been created that can reverse the years of yellowing of plastics, caused by the brominated flame retardants (which were added to the plastic when it was a masterbatch) migrating to the surface of the plastic and attracting oxygen molecules which become attached by a co-ordinate bond. 2. Bromine molecules are susceptible to ultra-violet light, in that che... [ read more ]

MAC Plus 1MB Restoration

by billdeg - 10/05/2008
Total messages in this thread: 1
I came upon a MAC Plus 1MB that when powered on starts to smoke. Took the system apart and found that it had a bad monitor. The connector from the power supply to the monitor had a burn rupture. The monitor itself seems to be disfunctional. I replaced the power supply board, and although I get the happy beep, nothing appears on the monitor. I did not pay for any of this so no harm trying.... [ read more ]

applying power to a KIM

by billdeg - 10/02/2008
Total messages in this thread: 1
Regarding applying power to a KIM..I am looking at page 8 of the KIM User Manual. Have I interpreted the schematic correctly? It appears that I should connect the ground lead of the power supply to pin 1, and connect a +5V wire to pin A. The +12V cassette lead should connect to the pin labeled N on the Application connector. I also have to connect pins K to 1. I would love to see a picture if there is one out there, but I found nothing. I will post one when I am done.... [ read more ]

Amiga 1200

by billdeg - 09/22/2008
Total messages in this thread: 1
Picked one of these up at VCF E 2008. Needs some work...will post more here asap.... [ read more ]

The Digital Group - bytemaster

by billdeg - 08/29/2008
Total messages in this thread: 1
The Digital Group ("the digital group") /bytemaster/ model computer - a portable? Short of a handle and a latch to hold the keyboard in place, and this computer is a portable. In the least this computer is an important system be aware of in the early one of the earliest portables.... [ read more ]

Apple II / Biorhythm 2008

by billdeg - 08/24/2008
Total messages in this thread: 1
Today I finished the alpha version an AppleSoft BASIC program for calculating a person's Biorhythm. There is no MOD function in AppleSoft (floating point) BASIC, and variables can only be one letter. I had to write a routine to calculate leap years without being able to call a MOD function, and my method is to compare the integer value of the quotient with the original quotient. I am not sure if it will work. I want to be able to plug any date from 1752 to 5000 AD to get a result. I also used a lot of arrays to get around the limit to the number of available simultaneous variables. There is a MOD function in the earlier Wosniak Interger BASIC, but its other limitations outweighed it's use. I do plan to have at least one Apple Integer BASIC demo program available as well, for authenticity-sake. Pictures of the Apple II setup coming soon.... [ read more ]

Basics for Using Northstart Horizon DOS

by billdeg - 08/24/2008
Total messages in this thread: 1
This is a copy of an email I sent to a fellow collector, regarding what to do at the plus prompt ( + ) upon successful boot of a Nortstar Horizon computer, using Northstar DOS. Here is my answer: I assume you have two working drives, if not stop and contact me. I am not sure how much you know about the N*, they're sometimes cryptic to follow. See if you can find a copy of the North Start System Software Manual. + means from the N* DOS prompt > means from the N* monitor (I assume you know what a monitor is) if you find yourself at this prompt the command OS will return you to N* DOS. drive 1 = left drive drive 2 = right drive +GO CD [enter] (follow the prompts) +GO CF[enter] (follow the prompts) CD means copy diskette CF means copy file +GO CF ABC ABC1 (copy the file ABC to ABC1) +LI 1 [enter] (what's on the left drive?) +LI 2 [enter] (what's on the right drive?) ... [ read more ]

TRS 80 Model 1 Early Magazine References

by billdeg - 05/26/2007
Total messages in this thread: 2
Last Post: [ which is first appliance computer? ] 08/13/2008
Currently working on my VCF East 3.0 exhibit, the 30th Anniversay of the TRS 80 Model 1. I scanned some research materials for possible use. These are the earliest references that I could find to the TRS 80 Model 1. http://www.vintage.../magazine/ Regarding the so-called low-cost "appliance computers" unveiled in 1977: the Apple II (Jan) came well before the PET (June)or the TRS 80 Model 1 (Aug). The TRS 80 was first publicly displayed in August of 1977 at Computermania (Boston) and I believe also PC-77 (Atlantic City), both on the same date.... [ read more ]

Interfacing an SWTPc 6800 using MP-S

by billdeg - 08/07/2008
Total messages in this thread: 2
Last Post: [ current configuration of your SWTPC ] 08/12/2008
Bob Grieb and Dan Roganti came by for some vintage hardware hacking, and we decided to try and interface an SWTPc 6800 with a Teletype model ASR 33. The SWTPc has an MP-S card installed. To start, the system was set to connect to a 300-baud terminal and it worked just fine. Why not take apart something perfectly good and *downgrade* the speed? First take a look at the same MP-S card first wired for a terminal, and second for a TTY:
SWTPc MP-S wired for a display terminal running at 300 baud. Note the baud jumpers at the bottom of this picture.
Compare with the next two pictures depicting the same card with the addition of a second cable connected to a teletype:
SWTPc MP-S "bottom view" with R1 shorted... [ read more ]

AT&T 6300 Restoration

by billdeg - 07/15/2008
Total messages in this thread: 3
Last Post: [ SW3 #1 to control hard drive ] 08/10/2008
Cobbled together a system from spare parts, but it's 100% AT&T stock for the 6300. I had trouble with the display for a while, but it revived itself. The system came to me with generic DOS 4.01. Decision time If my goal is to return the system to its original state which OS should I install given the following....? [a] The manual states that DOS 3.1 was shipped with the system. [b] The original AT&T 3.1 boot disk is missing. I only have the 2nd (supplemental/operating) diskette. [c] What I do have: AT&T 3.3 or MS DOS 3.1 DECISION I decided to go with AT&T 3.3, because manufacturer trumps version IMHO ________________________ Two more interesting things. [1] When the system boots, the system runs Resident Diagnostics Rev. 1.21 ... at C800:0000
At&T 6300 boot screen when optional ROM... [ read more ]

How to clean yellowed plastic

by billdeg - 08/08/2008
Total messages in this thread: 1
http://eab.abime.net/sho...d.php?t=37808 Sounds too good to be true, but I plan to test this ... stand by.... [ read more ]

Sock Puppet Interview at Last HOPE

by billdeg - 08/07/2008
Total messages in this thread: 1
"..Here's the video us sock puppets shot at the Last HOPE convention... .." http://www.youtub...tch?v=rw-LCwLAm0o If you watch the whole thing, you'll see where I am interviewed about vintage computers, specifically the Osborne 1 MARCH was displaying.... [ read more ]

SWTPc 6800 and ASR 33 Video

by billdeg - 07/28/2008
Total messages in this thread: 1
Thanks to Bob Grieb and Dan Roganti ... http://www.youtube.com/w...Xu0UTWh-HM4 This video depicts me using an ASR 33 teletype as a terminal with an SWTPc 6800 computer. The RAM cards are jumper'ed (at present) to 0000 -- 0FFF and 7000 -- 7FFF. The processor card uses some of A000 --->, and the SWTBUG uses the E000 --> page. enjoy...I will write more on the how/when/where's of this restoration project asap. ... [ read more ]
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