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I've had this for a long while, probably around 1998 I got it, didn't know anything about it back then and couldn't find any information about it. Going through college part of one course was working in assembly, to learn how to repair electronic boards. It is marked with Multitech, and MPF-1...

I'm in the middle of replacing all the line filter tantalum caps on my Compaq Portable, the board is pretty heavily populated (barring a couple of unfitted ROM sockets along from the BIOS). There's a little cluster of un-populated component locations up in the top corner by the speaker header...

Howdy all, Does anybody have either the parts list or schematic for the Compaq Portable 1 PSU? I'm (finally) working on recapping the thing and I'm trying to figure why the line filter caps (C1-C4) are physically so large for such modest values (100uF, 25v). They're inboard of the bridge...

All, I'm trying to figure if I'm doing something wrong; I have my Model III running LDOS 5.3.1, am running a copy of Scripsit 1.3.0 from Ira's database.. it all boots up and I can open a new file and start to type. I have a Tandy Daisy Wheel Printer 2 attached, and in BASIC I can LPRINT to it...

Howdy. I just finished recapping my 512 and due to years of bad storage the brightness control pot (R57, 1M Ohm) has failed internally. It's got really long legs that look like they've been bent from a horizontal mount to vertical and the support bracket on the back added as an afterthought...

Howdy, I'm in the middle of doing an electrolytic cap overhaul on my 512, and was looking at the floppy drive- it does work OK but I was wondering if it's worth changing the tantalum and electrolytic cans in the floppy drive also? The lower board is not too bad but access to the upper board...

Recently picked this beast up. Cleaned out the dirt (large volume) and powered it up after cleaning up all the contacts. Hard drive checks out good, surprisingly. 85Mb Seagate. I've ordered a new cable for the CDROM, which should be here Friday. Had a bit of fun playing Wolfenstein 3D...

All, I'm looking to make space inside my Compaq Portable, which has only a few expansion slots. Currently I have the Compaq CGA card, a single-density floppy controller, Ethernet card, Lo-Tech IDE-CF and a Diamond Flower MPF-1 multifuction card. The Multi-function card is great, it has a...

Starts up, prints, serial connection works (7/E/1 !). Missing the clear plexi cover on the front and it's yellowed from having sat under fluorescent lights for years. It's going to end up in the dumpster if nobody wants it. I have the service and user manuals for it. Complete with stand...

Okay, as y'all probably know, I have a Compaq luggable. I've been adding to it and changing it up in non-destructive ways. I like to be able to pull it all out and stick the original bits back in if possible. However, the machine is limited in size by the chassis, and as such it only has...

I had decided that the slow, noisy, slowly-failing Plus! HardCard-20 in the Compaq needed to be retired a while ago, along with the fact that 21Mb of storage is a little on the slim side these days, especially for a machine that has FTP capability to be able to move data really quickly from A to...

Uncovered this in the back of the warehouse here at work, long since written off. It's a 1978 Lanier (AES Montreal rebranded) Model 103 "No Problem" word processor. Pulled the fiberglass top covers off and had a bit of a look after a brief stint with the vacuum cleaner. It's an 8080...

Well, I've been enjoying my Portable I recently, but despite finding a stash of 5.25" floppy discs at work, they were all in kinda bad shape and generally didn't work, so I decided to bite the bullet and do an upgrade. My Portable has been fairly well expanded over the years. It had a couple of...

I ran into an interesting conundrum yesterday. I have "upgraded" my Compaq Portable to use a 3.5" drive and a half height 5.25" drive. It uses the original controller card. The 3.5" drive reads 720k disks perfectly, will access the entire thing, read/write fine etc., but DOS 6.22's FORMAT.COM...

Question I have a Daisy Wheel Printer II that is hooked up and working with my Model III, but out of curiosity, I see it has a Centronics connector on the back.. can you run it directly off a standard IBM-PC parallel > Centronics wire? I don't want to plug anything to anything else, save the...

All, These terminals have been like buses. Wait forever, then two come along at once. I now own two non-functional Wyse WY-60 terminals. One is literally all burned up around the flyback. Looks like either it took a lightning strike, surge, or the insulation on the flyback let go and it...

All, Rescued an HP 700/44 terminal from work today. Going to be discarded so I figured what the hey and snagged it. Got it home, tried the power on it to check for bangs and smoke. It liberated neither, but it didn't come on either. No raster, no beeps. Pulled it apart, checked the voltages...

All, With my Portable getting some good use, it's coming to the point where the screen drive board is beginning to act up. The image wavers around on the screen, most noticeably in 320x200 graphics mode. I've read elsewhere from the vintage TV guys that this is particularly common to bad power...

A lighter note from me today. Franken-battery! 20130808_120934 by renault9gta, on Flickr Took the battery apart in my Compaq Portable 386. These Eagle-Picher batteries are expensive! Bought a pair of 3.0V CR123A batteries for $3.75 off Amazon and hacked this together. Needed a bit of...

All, I know we've been here before with these things, but there's nothing like flogging a dead horse, so here goes. Having resolved some of the issues with my Compaq Portable, the hardcard-20 has started on an annoying habit. Upon power-up, it spins the drive up and then immediately begins to...