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other vintage hardware, software and languages • Sega Megadrive 2 PCB

Stardot about 5 months ago

This is something I haven't seen before, Z80 and 68000 CPUs on the same motherboard.There also seems to be 3 different types of memory chip and something likewise unusual that I've never seen, a capacitor array, next to the crystal.Apparently the Z80 cont …

CoCo µLabs (Micro-labs) CPrint centronics parallel port pak

VCFed about 5 months ago

I just bought one of these on ebay and have not been able to locate a manual. Software was apparently on a ROM, which must be on the reverse side of the PCB from looking at the attached photo. Does anyone have the manual or a link etc? See the review on …

CoCo µLabs (Micro-labs) CPrint centronics parallel port pak manual wanted

VCFed about 5 months ago

I just bought one of these on ebay and have not been able to locate a manual. Software was apparently on a ROM, which must be on the reverse side of the PCB from looking at the attached photo. Does anyone have the manual or a link etc? See the review on …
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8-bit acorn hardware • Model B Issue 7 "40th Anniversary Edition" not working

Stardot about 5 months ago

On the last ABUG-NL I got a blue (pcb) Beeb that doesn't work at all. Just a soft everlasting beep after power on. I plugged in the ICE-T65 and looked at the ROM. It only shows the block &2800-&287F repeated throughout the memory map from &C00 …

general • Homebrew BBC Micro

Stardot about 5 months ago

Hello all,I recently joined this great forum and have already popped a message in the Introduction section this afty. Hi Quick post for a bit of spot the BBC fun! I no longer own this particular computer, but just have a look at this curiosity!I bought …
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End of repairable PCBs?

VCFed about 5 months ago

Just finished reading about OCCAM, a solder-less process for assembling PCBs. If this method becomes standard practice, I can't see how a failing component on a PCB will be replaced. Basically, junk the board and get a new one (if you can). …
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WHAT TO DO WITH A DEAF/DUMB/DEAD APPLE-1 CPU SECTION

Apple Fritter about 5 months ago

Since my famous IC kits have sold out earlier this year, more and more Apple-1 builders are struggling with getting their APPLE-1 up and running. This post is meant to show a method to at least get a clue where the cuprit is which causes the Apple-1 not to …

MITS 1200 or similar Calculator PCB

VCFed about 5 months ago

I noticed several MITS 1200 PCBs on ebay recently for a quite reasonable price, but I wasn't looking to collect anything like that, so I didn't get one. They're all gone now. Then this CT5002 calculator chip from the early 70s fell into my lap the other d …

8-bit acorn hardware • PearTree MR3000 Mini ROM Board

Stardot about 5 months ago

Does any one have one of these ?https://www.computinghisto... ... M%20Board/I have one but no documentation - so I don't know where the four wires on the left, and the additional wire from the top goes to.It appears to be configures as two 16k …

Looking for assistnace with programming ATtiny2313

Apple Fritter about 5 months ago

Howdy friends,I am attempting to build Mike Willeal's keyboard ASC to PS2 Converter.  I finally overcame the battle of the Gerber files but had to use PCBWay instead of my usual PCB fab company, OSH Park.  While waiting for the PCB to arrive, I wanted to …
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acorn atom and acorn system series • 2532 / 2732 Adaptor Board

Stardot about 5 months ago

Does this look ok if I want to use a 2732 in place of a 2532 in the Atom? In particular, I've wired:2532 pin 12 (Gnd) to 2732 pin 18 (nCE)2532 pin 18 (A11) to 2732 pin 21 (A11)2532 pin 20 (PD/nPGM) to 2732 pin 20 (nOE)2532 pin 21 (VPP) left floating (it's …

PDP8E Friden Code Converter

VCFed about 5 months ago

A year ago or so, I was working on a code converter for my Friden Flexowriter to be able to communicate with my PDP8E. At that time I had the circuit built on a few breadboards with an RPI. The entire mess seemed to work rather good. Since then I developed …

Altos ***FAULT*** Failure after boot...

VCFed about 5 months ago

I'm an avid Altos collector. I dug out of one of the closets an Altos 586T to begin working on. Cleaned it all up, recapped power supply, rebuilt tape drive, cleaned floppy drive. I have a bunch of other Altos machines so been through this process before. …

Official Addon Boards • mt32-pi not Booting on Model 3 A+ board; Shows "Power Failure Type B" Blink Pattern [Solved]

MISTerFPGA about 5 months ago

This was originally going to be a request for help, but in the effort of collecting information for my issue, I was able to find a solution.ProblemI got a misterfpga.co.uk mt32-pi hat, a Raspberry Pi 3 Model A+ board, and a Geekworm enclosure. I prepared …

Is anyone a member on arcadeotaku.com?

Neo Geo Forums about 5 months ago

I'm trying to find a PCB of Big Fight, Big Trouble in the atlantic. I lost the last one on yahoo auctions in september, and haven't been able to find one since. I'm pretty sure I'm going to have more luck on arcadeotaku than Klov, and arcade-projects. It' …

8-bit acorn hardware • Electron +3 spontaneously died

Stardot about 5 months ago

Been using the Elk all day, then suddenly I notice the screen's "frozen" - no flashing cursor.Ctrl-Break does nothing.Powercycle.Just get white bars across the whole screen.Pull it all apart, +1, +3, Elkonet, etc.After some fiddling, it turns out the Elk …
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Intelligent Roland MPU-401 Clone PCB(s)

VCFed about 6 months ago

PMs only please! 1X MDR-401X 8BIT ISA Intelligent Roland MPU-401 clone with break-out cable: $85: fCONUS shipping included. 2X MDR-401X 8BIT ISA Intelligent Roland MPU-401 clone with break-out cable: $150: CONUS shipping included. ..... …

Commodore PET Universal 8032086 measurements

VCFed about 6 months ago

I'm busy with a project to, as close as possible, recreate the PCB layout from scratch for the Commodore PET Universal 8032086. About 95% completed and have been using the schematic diagrams and hi-res pics of the motherboards to re-create the PCB layout. …

ISA Super VGA Sergey’s - monochrome

VCFed about 6 months ago

Hello I made an ISA Super VGA card. PCB V1.1. On a Commodore PC10 computer, the video is monochrome. 1. I removed FB6 and C17 - no change, monochomatic video 2. Bios 3.51 and 4.01 - no changes, monochomatic video 3. I connected the original TRIDENT VGA …

SUGGEST: Missing Caps in a Biostar M5VNB Socket 7 motherboard

VCFed about 6 months ago

Hello Friends, Yesterday, I found this Biostar M5VNB Socket 7 motherboard from a dealer. This one - https://theretroweb.com/mot... in my un-experienced eyes, I can guess that these few Caps are missing! Because they have marks …
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8-bit acorn hardware • New MicroSD card PCB for use with MMFS

Stardot about 6 months ago

I know there are already a good number of MMFS solutions out there, and I previously had a solution where you could plug in a standard Arduino style SD card interface into one of my PCBs:viewtopic.php?t=19788H... I have now run out of those PCBs and i …
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8-bit acorn hardware • Tube ULA Re-Implementation

Stardot about 6 months ago

Hi all,Part 1 : Project OverviewI have a 6502 Cheese Wedge with a broken ULA, so I thought it would be nice to get this back into service. As original ULAs are rather hard to come by, it's worth creating a modern replacement. This is a fairly well-worn pa …
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Pro-Log 4410 (PLS-441) Logic Processor Card

VCFed about 6 months ago

I have a Pro-Log 4410 (PLS-441) Logic Processor Card up for offers This card uses an Intel 4040 4-Bit CPU …

Hardware hacks and extensions • Atmos replacement keyboard

Defence Force about 6 months ago

Are there any projects for an Atmos replacement keyboard PCB that would utilize Cherry MX switches and caps?Asking for a friend.Statistics: Posted by protek — Fri Dec 01, 2023 1:42 pm — Replies 3 — Views 1568 …
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Videx softswitch fab

Apple Fritter about 6 months ago

Hi all,I'm making my own Videx softswitch. I have the 80 col card in  my ][+ and it works great with a pushbutton A/B switch but I don't have a softswitch. I've seen them on eBay but I think it would be fun to make my own (I etch my own PCBs). I saw a PCB …