Included tags: Troubleshooting ×
Excluded tags: None
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The Dreamcast Directory: Websites We Love in 2024

The Dreamcast Junkyard about 8 days ago

Late last year, in a gratuitous act of procrastination, I authored a piece for the Junkyard that surveyed the hefty range of Dreamcast websites that had sprung up in the console’s “post-Sega” era but which had sadly since bit the dust. In reality tha …
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Display Devices • Phillips Discoverer TV - Fuzzy Untuned Screen

MISTerFPGA about 2 months ago

Hello,This is my first post! Recently got a Mister and have been very impressed so far, so much so I went out and got hold of a Phillips Discoverer CRT TV, which looks awesome, but I am having a few issues with getting it working correctly with Mister. Es …

486 Troubleshooting assistance... data lines all high etc

VCFed about 3 months ago

Hello. I have a Gigabyte GA486-US motherboard, which looks exactly like this: ... GA-486US Gi... GA-486US is a motherboard based on the UMC UM82C480 (386/486 PC Chip Set) chipset. Get specs, BIOS …

Display Devices • Trouble with svideo output

MISTerFPGA about 3 months ago

I’m not getting any image on either of my CRTs when using the VGA output with an active YC adapter. I’ve made the required changes to mister.ini, changing the VGA output to svideo, and composite sync to 1. I’ve supplied power to the USB C input o …
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Mac+ won't boot but gives startup tone

Apple Fritter about 3 months ago

I pulled out my Mac+ out of storage and tried to boot it up today. It gave me the start up tone that sounded correct, but the screen was black with a messed up looking insert disk image in the center. I put in a bootable disk, but nothing happened. Restart …

PCMCIA to CF adapter recommendations

VCFed about 3 months ago

My current PCMCIA to CF adapter (SanDisk brand) just refuses to work with Windows 9x. I’ve done enough troubleshooting across probably close to a dozen laptops to know it’s not drivers, and I highly doubt it’s the cards I’m using either. Not one 9x …

DEC RA92 Troubleshooting

VCFed about 3 months ago

Dear all! Any RA92 operators here? I recently got a few RA92 Drive unit beasts (>30kg each) . All of them have been stored for years in unfavorable conditions, so there is dirt and rust on the enclosure. The drive (HDA) and electronics look almost new …

Commodore PET 2001 troubleshooting

VCFed about 3 months ago

Hello everybody, a friend of mine found his old pet in the basement and wanted to test if it still worked...unfortunately it didn't. He turned it on with the cover opened and observed a small flash and heard a "pop" (and it smelled like somethin …

Toshiba T4400 Power Supply Pinouts?

VCFed about 3 months ago

I have 3 T4400 power supplies that I'm troubleshooting after replacing all the caps. I get enough life from them to get blink codes ( variously related to memory initialization) I'm hoping someone could enlighten me as to the pinouts. I know the obvious …
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IIC Apple Scribe Printer - Select light flashing 3 times

Apple Fritter about 3 months ago

Hello, I have a fairly clean IIC Apple Scribe Printer, select light flashing 3 times.  I've checked that paper and ribbon are loaded and the cover is in place.  According to the manual 3 flashes per second indicates "out of ribbon."   I disconnected th …

Troubleshooting disk drive issue

Apple Fritter about 3 months ago

I have an Apple IIe that has stopped reading disks.  I was loading various disks that I had lying around to see what was on them and the system just stopped loading anything off the disk drive (duodisk).   Here is the steps I have taken so far:I examine …

Troubleshooting Apple II Plus -- System Board or Power Supply?

Apple Fritter about 3 months ago

Hello, When I turn on my Apple II Plus, the system doesn't boot and the power supply makes a rapid ticking noise.  When I disconnect the power supply, I can read the correct voltages on the Power Supply connector.  At this point, I am unsure as to wheth …

Contrasting

VCFed about 4 months ago

Greetings, The choices and/or functions and/or file names, can't be read. Is contrasting the correct description? The OS/2 manual only addressed troubleshooting procedures with resolution problems, upon installation and are present in all files as well. Th …

IBM XT Clone Memory Question

VCFed about 4 months ago

I was relating to a colleague my tale about troubleshooting memory issues on a XT clone motherboard with 640K RAM on board. I told him that I had found a defective 256K RAM chip and a defective 64K RAM chip. I said that I had a replacement 256K chip on han …

Commodore PC 40 III Repair Advice & Further Diagnostic Information

VCFed about 4 months ago

So I have a Commodore PC 40 III that needs the CMOS battery replaced which is in the form of a Dallas Chip battery. Earlier this week with relatively 0 electronics repair experience I tried to de-solder the chip. I don't entirely remember in what order th …

DECStation 5000/120 PSU (H7286-AA) troubleshooting info?

VCFed about 4 months ago

Hi folks, I'm trying to resurrect a DECStation 5000/120 that I got in an unknown state. For starters, it won't turn on. The fuses are good, and the capacitors in the input section of the power supply look good on visual inspection (no signs of smoke/burns …

modern RAM boards possible?

VCFed about 4 months ago

I'm not well versed in all things Apple // but given the prospect of sourcing multiple 4116 DRAMs for either troubleshooting, repair or upgrading to 48K, are there alternatives? 4164 DRAM ICs (modified) can work as far as I know (happy for anyone to chime …
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Looking for suggestion on troubleshooting LCII board problem(s)

Apple Fritter about 4 months ago

Is there a good resource for troubleshooting a board issue with an LCII? Problem is strange, video has a pattern of vertical lines that are tied to bit-depth, almost like bad bit(s). But it's not the VRAM nor RAM. Apple Personal Diags tests both are fine. …

NorthStar Horizon Z80 ROM monitor/diagnostic tool

VCFed about 4 months ago

https://github.com/codesleu... NorthStar Horizon is a S-100 bus Z80 computer from 1977. This ROM monitor was created as part of a restoration project. The initial need was a diagnostic to isolate and troubleshoot basic hardwa …

Newcomers Forum • [SOLVED] AnalogIO board, Arcade CRT and *some* cores

MISTerFPGA about 5 months ago

Here's an interesting one, to me at least. I've had my Mister for a few years, but recently decided to build up my dream cab. This consists of:MisterFPGASingle RAM boardAnalog IO boardWG model 25K7193 (K7000 series standard res)USB hubWhat I'm trying to …

TRS-80 troubleshooting

VCFed about 5 months ago

Hey so I just got a trs-80 model one and need some help troubleshooting, just to go over the list of issues, When turned on (both the expansion interface and computer itself) there is no output display, just a blank white screen, tried holding break when i …

VIC-20 clock problem

VCFed about 5 months ago

I have a VIC-20 that has bad sound. the 36874 and 36875 registers dont play sound at all and 36876 is not playing the correct frequencies. if you play every tone from 128 to 255 you notice that the scale starts over a few times. i have checked the clock i …

IBM PS/2 Power Supply - High pitch whine / no voltage under load / super hot 5w resistors

VCFed about 5 months ago

Hi, I recently acquired a dead IBM PS/2 Model 50 Z. Upon initial troubleshooting it appears as if the power supply is the main problem. When turning on the computer, I get no video, no beeps, and a high pitch whine out of the power supply. If I unplug the …

Apple II Plus logic board troubleshooting

VCFed about 6 months ago

I'm troubleshooting a II Plus board from an ill-treated and poorly stored machine. I get question marks on the screen and a few clicks from the speaker instead of a beep. So far the following has been done: 1. Power supply tested good, all voltage rails …
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Help & Support • 1541 drive—need help diagnosing failed component

Lemon64 about 6 months ago

Hi all,I have a power issue on my drive and haven’t found a definitive solution online so decided to post the details here. I’m troubleshooting a 12v issue. At power up, drive lights come on as expected with the green led staying lit and the red led c …