Included tags: pcb ×
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Altair 8800bt Parts

VCFed about 6 months ago

Hi! I have an Altair 8800bt case, PSU and turnkey card. I am trying to find an 8800b CPU card and the turnkey PCB along with the front dress panel. I was bidding on an 8800b CPU card but for some reason they seem to go for $400+ in the usual crazy biddi …

H758-a Schematic

VCFed about 6 months ago

I have just acquired a DEC H758-a power supply. The plus and minus 15VDC supplies seem to be fine but the +5VDC supply is not working (0.2VDC). Does anyone have a schematic of this supply? I couldn't find it with a google search. Also, what is the best …

IBM 5162 Prototype ?

VCFed about 6 months ago

I recently purchased an unusual IBM 5162. It can start up normally. Nameplate indicates that it is a 5162. However, when opening it, I discovered that its motherboard was really peculiar. In contrast to others, my motherboard's chips—including the CPU …

Sharp PC-1211 tape loading problems (TRS-80 PC-1)

VCFed about 6 months ago

Hi, I just finished refurbishing a Printer/Cassette interface CE-122 for the Sharp PC-1211. I am still waiting for my replacement LCD to arrive for the computer itself, but the old LCD is still partly usable. The PCB of the CE-122 interface had some corr …
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Help & Support • Older version of Tapuino project

Lemon64 about 6 months ago

I'm looking for a PCB, BOM, and build instructions in order to build a Tapuino that doesn't have SMD components on the Tapuino board. Of the information I have found, it calls for 4 buttons to control the user input. But I can't find any finished ones tha …
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Kaypro II Keybaord

Apple Fritter about 6 months ago

Greetings friends;I hope someone might be able to help me out. I am trying to find the schematic to a Kaypro II keyboard. I have done a lot of searching online, including some threads here, but no luck.There were a few variations of keyboard PCBs and I am …
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Apple Computer A original parts

Apple Fritter about 6 months ago

Hey, guys!I recently received a replica circuit board of Apple Computer A. I must admit it is a great job, thanks Michael Ng!  1000006833.jpg  My plan is to assemble this replica as close to the original photos as possible …
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Shiva Netbridge Rev.2 (Appletalk)

VCFed about 6 months ago

I have a Shiva Netbridge Rev. 2 (Appletalk) up for offers. It is missing the front plate that would cover everything except the L.E.D.'s. …
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IBM 1503968XM Floppy Controller

VCFed about 6 months ago

I found this 1503968XM floppy controller card in my collection but wasn't able to find any reference to that number. It appears almost identical to the 6181682 floppy controller except the appearance of RP-1 in the top-right corner (and the fact that 4 chi …
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Help & Support • C64C mitsumi carbon pads

Lemon64 about 6 months ago

Hi!I recently bought an "untested" C64C from eBay that turned out to be bit of a disaster. 2 x CIA, 2 x RAM, CPU and SID have been replaced. The PCB was really dirty as well. A cotton swap + IPA came back black after several passes. I suspect that it has …

NEC Multisync II (JC-1402) monitor repair notes

VCFed about 6 months ago

Hi, I bought this monitor back in 2015 as faulty, and it has been sat on my shelf until a few weeks ago. The service manual is on-line, make sure when downloading your copy has page 2 with the connector pin-outs and signals as some versions out there have …

4-Slot Metal Cage (Large PCB Version)

Neo Geo Forums about 6 months ago

Looking for a cage top. Message if you have one available. Thanks …

Atari Selling Repro PCBs

Neo Geo Forums about 6 months ago

If this has been mentioned previously, forgive me, but I was surprised to see Atari selling officially licensed PCBs of their classic games. Apparently, like everything else at this time of year, they are on sale too: Major Havoc, Rev. E Food Fight Gravi …
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A warning about the "improved ACI" PCB confusion (or scams)

Apple Fritter about 6 months ago

Hi fans - it has been brought to my attention that some sellers on Ebay (and possibly elsewhere) advertise "improved" ACI PCBs for sale. Here is my WARNING to you: Do not confuse these "improved" ACI PCBs with the "Gen1" or "Gen2" improved ACI PCBs whic …

Question about Capacitor on the MVS/AES PCB

Neo Geo Forums about 6 months ago

I recently discovered that there are two capacitors on certain PCBs like Garou MOW. Has anyone experienced issues with capacitors leaking liquid or breaking? Do I need to be concerned about the capacitors even if I hardly ever play the game and only keep …

SOL-20 3.5mm pcb mount audio jack.

VCFed about 6 months ago

About 4 years ago I noticed that the pcb mounted 3.5mm audio jack sockets used for the tape connections on the SOL-20 mobo, were a fairly unique and rare part. They happened to be the same ones used in the Votrax TNT for the speaker. They have a very speci …
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Feature: Zanac, Aleste And Gunhed Devs Join Forces For NES Shmup 'Chouyoku Senki Estique'

Time Extension about 6 months ago

Fast and impressive flicker-free blasting.It's an exciting period to be an enthusiast of old hardware, as the homebrew community makes use of modern technology plus decades of experience to create a wealth of new releases. Recent examples have included Spa …

UNCLE BERNIE'S IOU (and MMU) SUBSTITUTES IN PLDs

Apple Fritter about 6 months ago

Hi fans -may may have followed the work done by two people on substituting the MMU, see here: https://www.applefri... those who don't know yet, the MMU and the IOU are full custom ICs in DIL-40 p …

IBM PS/1 2011 30mb hard drive won't accept writes.

VCFed about 6 months ago

I recently acquired as PS/1 2011. It had a fault in the floppy drive that kept the system from starting due to short circuit protection. I waffled a bit about replacing the floppy with a regular 1.44mb one and tried using an adapter from Ebay. It did th …
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A strange CDC160A

VCFed about 6 months ago

Saw a CDC160A for the first time yesterday. But what is it with that big rack of PCB's on the backside / on top ? Never seen this on one of the online pictures. That rack also contains a corememory. Isn't the real computer supposed to be in the lower ri …

New Z80 CMOS NMOS Tester

VCFed about 6 months ago

Created a new Z80 tester PCB to sort through my stack of China sourced remarked chips. Unlike a simple NOP tester, this one loads code from an EPROM, can test at multiple frequencies, and distinguishes between CMOS and NMOS versions of the chip. …
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New Dreamcast Compatible Arcade Fight Stick heading to IndieGoGo!

The Dreamcast Junkyard about 6 months ago

We've seen a lot of new indie hardware teased or released for the Sega Dreamcast in the last few years - such as the VM2 and a number of new controllers - but what with the popularity of fighters on the system, it was only a matter of time before someone p …

Casio AS-A 1969 Nixie Calculator - Division Issue

VCFed about 6 months ago

Dear all, I got this calculator that works flawlessly except for a intermittent (but most of the time) division issue. Entry/Plus/Minus/Multiply work reliably. Attached you find the manual in German, schematics of the very similar successor of the model ( …

Hard to source components as of late 2023

Apple Fritter about 6 months ago

All, I am new here. I acquired recently an Apple 1 reproduction PCB, maybe without thinking things entirely through ;) I am now considering building my Apple 1 replica and I read many of the message on these forums. As of late 2023, in the absence of Unc …
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Unified Retro Keyboard for Apple 1 or misc. ASCII $120

Apple Fritter about 6 months ago

For sale is one "everything but keycaps" best used with an Apple 1 replica or 1970's-era computers with ASCII interface, though it is also compatible with Apple II, II+, it will not fit in their cases because of the full set of keyswitches that are install …