test-drb February 2006

test-drb@ccmp.vtda.org

224 participants
452 discussions

by CaptnZilog＠aol.com

Got some misc. stuff to get rid of: got a box full of old ISA etherepress boards, 10BT w/ BNC for Thinnet (quite a few), plus some random ISA and VESA video boards (not a lot), oh yeah, and various MFM disk controllers (ISA bus - WD1007, etc). Also have two AMI EISA 486 motherboards, and some EISA boards, adaptec2742 SCSI, EISA 10BT ethernet... if anyone still plays w/ EISA, all yours (motherboards w/ memory). Also, if anyone has any projects where you might need Pentium 133/166 chips (and 386/486's as well), I have a bunch of them (just the chips), a big bag of 1MB 30-pin SIMMs, 4116 & 4164 RAM chips (probably a couple hundred of each), 2716/32/64 EPROMs... Anyone wants some, I certainly will never use all of them that I've got.

18 years, 5 months

Changing the PC floppy port address

by CCTalk＠catcorner.org

I know it can be done, I'm just not sure how. I have an adaptec 1542B controller that I'm using the floppy controller on. It current has two options for the floppy controller: 3F0-3F7h or 370-377h 3F0 (001111110000) is with J8/1 open 370 (001101110000) is with J8/1 closed I'd like to re-address this to something else, like 320 or 330 or even the LPT or serial port addresses. Now, how the heck would I go about this? I'm pretty good with a soldering iron, and I know how to count. Being a bit of an ISA bus neophyte, are these addresses selected by the "Data" lines of the ISA connector (D0-D7), or what exactly is being read? The 1542 uses a DP8473 floppy Disk Controller, nad I have the datasheet for that. Thanks, Kelly

18 years, 5 months

Help with HP 4951B protocol analyzer + 18179A

by dwight.elvey＠amd.com

>From: ard at p850ug1.demon.co.uk > >> My unit has a BNC type connector (think that's what it's called) on it. Mos= >> t >> composite monitors take RCA cables. Should I be able to find the right cabl= > >Well, most decent composite monitors have BNC inputs, but anyway. Most >of the cheaper composite monitors have RCA phono sockets > >> e >> off-the-shelf? > >It's a standard cable in the UK, it was often used to link a BBC micro >(which also has a BNC socket for the composite output) to a cheap >monitor. I bought one from Maplin a couple of weeks back. > >No idea if you can get them in the States. I think Maplin will ship >worldwide, but their postage charges are not that low. > >-tony Hi I've made a couple of these from cable, both starting from RCA on both ends and BNC on both ends. Get the connector you need from RS or other supply and make the cable. It only takes a few minutes and doesn't require special skills, other than using a soldering iron. One can get adapters as well. Allied has a part #202-0835 that is RCA jack to BNC plug. They're only $2.63 but I think they have a minimum purchase. ( BOMAR part# R0843 ) Dwight Dwight

18 years, 5 months

Documents available -- Centronics, Terminet, Vadic, Shintron, Perkin-Elmer, Best Power

by wmaddox＠pacbell.net

All are photocopies except as noted: User manual for Carousel 310 and Carousel 350 printer Perkin-Elmer, 1978 (photocopy) Operation and Service Manual for VA3415C/D/V 1200bps Modem Vadic, 1977 Installation Instructions, VA3400 Series Modem includes theory of operation and calibration Vadic, 1975 Shintron Model 520 Ecricon(R) Graphic Data Tablet Instruction Manual Shintron Company, Inc., 1972 (original document) Technical Manual, Model 306 Printer Centronics Data Computer Corp., 1981 (original document) Model 6080 Printer Operators Manual, Rev. A Centronics Data Computer Corp., 1982 (original document) Operators Manual, Series 100 Printers Centronics Data Computer Corp., 1973 Revision Identification Guide for the Model 101 and 101A Printer Centronics Data Computer Corp., 1973 Maintenance and Field Change Bulletin for Centronics Model 101/101A Printers DEC-FS-HPTRA-A-D Digital Equipment Corporation (Centronics reprint) Partial copy of GE Terminet 300 maintenance manual Many Terminet Service Advice notices (mid 70's) Micro-Ferrups Uninterruptible Power Systems User Manual Best Power, 1993 (original document)

18 years, 5 months

Old Japanese MPUs

by cclist＠sydex.com

I ran across a small (3'x4") PCB with what looks like an MPU on it. The part numbers for the most mean nothing to me. There's a 27C256 on it and a 20 MHz XCO and some assorted glue. The largest package is a Mitsubishi MN8601ME1, 64 pin "shrink DIP". Next to it is a MN8611A 42 pin "shrink DIP" and a QFP MN51040MGU, which I believe is a gate array. Does anyone have a clue as to what the heck this is? Cheers, Chuck

18 years, 5 months

What fits a machine pin DIP socket?

by swtpc6800＠comcast.net

I tried several types of pins and found the 22-gage wire works well. I get the wire from capacitor leads. Some capacitors have steel leads, these make excellent pins. (The leads can be picked up with a magnet.) You can still use the capacitor after you trim the leads. I wrote up how to do this for a ROM replacement for the SWTPC 6800. Look in the Users Guide for the step by step process. http://www.swtpc.com/mholley/ROM_Emulator/ROM_Index.htm J.C. Wren's find of the DigiKey ED2064-ND looks good. Michael Holley

18 years, 5 months

classiccmping and cold weather

by lee＠geekdot.com

> Any idea if this would effect the original Game Boy's? > I don't know what it is about them, but I had two of them that > lost lines on the display after they sat unused for a year or two. Unlikely, temperature damage tends to affect the whole display, either uniformly or graduated from the area that was frozen or heated. Lost lines are usually due to the connection to the conductors on the glass becomming detached. This can often be repaired just by bending the tabs on the back of the LCD fram a little. Lee.

18 years, 5 months

KDF11-BA (M8189) 11/23+ CPU boot an ST225 on an RQDX3?

by dbetz＠xlisper.com

I just picked up a couple of KDF11-BA CPU modules. For some reason, I thought I remembered that the 11/23+ could boot an MFM drive (ST225) attached to an RQDX3 controller but it doesn't look like that from the description of the boot options on the M8189 module. Is there an alternate boot ROM that can be installed or am I just out of luck?

18 years, 5 months

What fits a machine pin DIP socket?

by cclist＠sydex.com

I'm making an adapter on a small PC board here to fit a 40 pin DIP machine-pin socket. I'm not certain what to use for the pins on the PCB that will be inserted into the socket. Ordinary 0.100 pitch square-pin header stock might fit, but I'm concerned about it damaging the socket so that a standard 40 pin IC inserted into the socket may no longer work reliably. Any suggestions? Thanks, Chuck

18 years, 5 months

Help with HP 4951B protocol analyzer + 18179A

by lee＠geekdot.com

> I'd read that too, but somebody sent me a private e-mail saying that > the mating diameters of the inner pins of both types of connector were > the same, It depends on the connector type, BNC and TNC yes, C, N and MUSA no. Also 50 and 75 ohm aren't the only impedances, just the most common. Lee.

18 years, 5 months

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test-drb February 2006