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64 and 256K DRAM Testing Serviceby billdeg Total messages in this thread: 1 I have a RAMCHECK brand 64Kb / 256Kb DRAM chip tester...if anyone needs a chip tested, let me know. You send me the chips and I return then in whatever you sent them. The price/trade is negotiable. Limited time offer. Contact me if interested. 16 pins - here are some examples: 64K: 4164 8164 4164C 3764 4264 4164 4864 256K: 4256 81256 6256 41256 1256 0256 4257 (nibble mode) 81257 41257 50257 ">... [ read more ] |
TM990/101 Mby billdeg Total messages in this thread: 5 Updated: [ FAO Richard Lynch (was TM990/101 M) ] 01/19/2008 I have a TI chassis I have been unable to locate documentation. Can anyone help shed some light on the following. .? The card chassis: Within a Steel 4-slot Texas Instruments card chassis the size of a shoe box are four Texas Instruments cards manufactured in the US. These cards resemble a regular s-100 card but the 100 contacts are off center, to the left when viewing the component side with the 100 pin side down. Printed on the chassis is Assy No. is 0994676-0001 and Diag No. 0394677. I do not have a power supply, but I assume you'd attach to terminals on the back of the chassis somehow (?). Inside are 4 cards. Two cards are similar are RAM/EPROM cards with 32K in each (8 x 4 rows I assume = 32K?). The RAM is a mix of TMS 4045-30NL, TMS 4045-30, and TMS 4014NL. There are no Eproms installed, but there are two rows of empty slots on the card. Each card has 8 dip switches. ">... [ read more ] |
Replacing an Apple III Power Supplyby billdeg Total messages in this thread: 2 Updated: [ Replaced Power Supply ] 01/08/2008 Received an Apple III not powering up. Noticed that the fuse appeared to be blown. It's a 5mf 2 3/4 A fuse about 3/4" tall. Confirmed that this the correct fuse. Bought replacement fuse, that one popped too...must be a bad power supply...">... [ read more ] |
IBM PS/2 model 70by billdeg Total messages in this thread: 2 Updated: [ Source for PS/2 1.44 Drive 15F7503 ] 01/06/2008 I picked up an IBM PS/2 model 70 but it has a bad (or dirty) disk drive - working to restore to Windows 386 (thanks Bryan) and DOS 4.0, as it would have had in the Summer/Fall of 1988 when the 70 was launched. My 70 has 6 Megs. No, I am not loading OS/2.">... [ read more ] |
IBM Thinkpad 755 CDby billdeg Total messages in this thread: 1 I have an IBM Thinkpad with a bad keyboard, I plan to replace and rebuild. more to follow. ">... [ read more ] |
Data Acquisition Corporation DAC-512by billdeg Total messages in this thread: 1 FYI The following link was submitted through this web site of a Data Acquisition Corporation DAC-512 brochure scan by Charles Falconer: http://cbfalc...t.net/firstpc/ Chuck designed the machine. He was VP and Chief Engineer Please use the address below for any replies. Chuck F (cbfalconer at maineline dot net) http://cbfalconer.home.att.net">... [ read more ] |
Research Libraryby billdeg Total messages in this thread: 1 One of these days I will post a complete list of all of the books and magazines, product literature and docs on hand. Here are a few snapshots: Pics">... [ read more ] |
Toshiba Laptopsby billdeg Total messages in this thread: 1 I have a couple of Toshiba Laptops that do not work. I believe that they're salvageable, but I am not that interested in them. Contact me if you want them cheap. Pics ">... [ read more ] |
Commodore troubleshooting linksby billdeg Total messages in this thread: 1 Here are some useful Commodore troubleshooting links. http://www.zimmers.net/a...rs/Commodore/index.html">... [ read more ] |
Byte June 1980 I-O Expansion TRS 80by billdeg Total messages in this thread: 2 Updated: [ Byte June 1980 I-O Expansion TRS 80 ] 11/16/2007 I received this request: "..Hello, Years back i built for my model 1 an RS232 port based on an article in Byte (June 1980). I made some changes to the design which i have noted down. However i lost the original article (rather thrown away years ago all my copies of Byte...). Can somebody get me a scan of this article (around page 50) or direct me to a place i can find it on the internet (Byte.com does not carry it)? Hope somebody can help me as i am trying to fire up my model 1 again. .." Here is the article: Byte June 1980 I/O Expansion TRS 80 Byte June 1980 Cover ">... [ read more ] |
Commodore "Coherent"by billdeg Total messages in this thread: 2 Updated: [ Commodore Coherent never launched ] 11/08/2007 Anyone know what happened with "Coherent"? From Byte Feb 1984: "Commodore Plans UNIX-Like Operating system for Z8000-Based Computer" "Commodore announced that it will include the UNIX-like Coherent operating system in a new series of Z8000-based computers. Schedule to be formally announced in May, Commodore's new computer will be called the Next Generation and will include 256K bytes of RAM and one or two floppy-disk drives at a price the company says will be much lower than any comparable system. All of Commodore's previous computers have been based on variations of the 6502 microprocessor developed by Commodore's MOS Technology division. Commodore has a license to manufacture Zilog's Z8000 processor." ">... [ read more ] |
TRS 80 Mod 4Pby billdeg Total messages in this thread: 1 I just picked up a TRS 80 Model 4p with a nice white chassis. I took a sampler of boot disks that are known to work on a regular Model 4. I thought I would test them on the 4P (it came with no software). NEW DOS 8 TRS DOS 6.2 LDOS 5.14 DOS Plus 3.5 DOS Plus 3.4 TRS DOS 1.3 When I try them on the 4P, I get the following message: "Loading ROM Image" ...and then a few seconds later the error message: "The ROM Image Was Not Found on Drive 0" EXCEPT when I boot TRS DOS 6.2 The manual indicates that TRSDOS 6 ships with the 4P. It is that simple, you can only boot a 4P with 6.x? Nope...you need to copy the Model III ROM file from any bootable disk. The 4 P does not come with the Model III ROM installed, you need a diskette with this "ROM" file. Fortunately in addition to 6.2, I have a utility programs that boot: Copycat 4.1 and a Hyperzap 3.2, Super Utility ! 4/4P ">... [ read more ] |
Inforex Core Memory Controllerby billdeg Total messages in this thread: 2 Updated: [ Inforex Core Memory Controller ] 10/17/2007 I received a box containing an INFOREX Core Memory Controller from late 1970 / early 1971 and a DATARAM core memory cartridge / daughter card. The DATARAM core is 4K I believe, but I did not open it to check. The box also contained a document from 1978 about this type of 4K and 8K core memory, and some interesting pages about installing and using core memory with an S-100 data bus. I assume that this particular DATARAM core memory could be used in both the pictured below DEC-like controller and a homebrew S-100 controller.. Given the condition of the card and memory, it's very possible that these components work. Now I just need a computer to put them in...hmmm. Pics">... [ read more ] |
Seeking license page from dBase IIby yosh Total messages in this thread: 3 Updated: [ Seeking license page from dBase II ] 10/12/2007 Does anyone have an original dBase II manual? If so, I'd appreciate a copy of the original dBase II License statement. If someone has and can scan & email it to me, I'd much appreciate it. my email is yosh at mantinband ddot com. Thanks! Yosh ">... [ read more ] |
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Updated: [ Belt Replacement Exatron Stringy Floppy ] 01/23/2008
I have found a vendor for drive belts, and I have mailed out a snapped belt for analysis. The company is called Pyramid. I will post an update when available. I have four drives that need belts, and about 100 stringy floppies to read.">... [ read more ]