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Hi all, I've recently opened all of my Vectrexen, and found a ridiculous number of variations of ways the "PWB 35001A" logic PCB was populated. I have 3 variations of the values for C304-C306 (2 documented at console5, one matches the schematic). There were at least 3 variations of R329, R330...

Problem: ~RESET (6809 pin 37) is always low. All the chips in this system work fine in another system. R208, C228, C229, D201, and R201 are all good. Everything in the schematic that is supposed to be on the RESET circuit is connected, and I've done a thorough search for shorts to anything in...

I'm working on a PS from a 5170. The DC voltages all have a lot of noise, rapdily varying by 0.1 - 0.2V RMS, also the negative rails are "high" (-3V on the -5V rail, and -10.5V on the -12V rail). The interesting bit is that I took a look at the DC output with an oscilloscope, and all the rails...

I just got stupidly lucky with a recent 5160 purchase. The machine contained a nice Tecmar muli-function + memory + clock card and an 8-bit VGA, card but the real gems are a CompatiCard IV, and the aforementioned Ramquest 8/16. The Ramquest will most likely go into a 5170 I'm working on (if it...

I was reading some other threads on here from a few years ago about producing alignment diskettes. I'm in need of alignment diskettes for 5 1/4" 360k and 1.2m drives, and would gladly pay for them. I have some 1.2m drives that seem pretty well aligned based on their ability to read disks from 40...

I'm trying to get this mb working to build a system for accessing data from a variety of old media. It as 2x ISA slots, 5x PCI, and 1x AGP. On board, it has 2x IDE, 1x FDC, Adaptec AIC-7890 Ultra2 SCSI, and 2x USB. MB has an AMI BIOS. Problem: ROMs on ISA cards only load if the on-board SCSI...

I just picked up a Model 3 that looked as if it had been through a flood. After hosing it off (and out), I've separated it into its components and started debugging it. The floppy drive was rusted solid, but the circuit boards cleaned up remarkably well. 23 out of 24 of the RAM chips tested...

Subject pretty much covers it. I'm looking for the manual or jumper settings for the Jameco JE-1043 floppy controller. The one I have has a newer ROM image than is available at minuszerodegrees.net/rom/rom.htm (mine is E6610 C2, site has E6610 C1). I can make this available if desired. This card...

Apologies in advance if there's a better place to post this. TL;NGTR: I/O Address can't be changed with the card in an 8-bit slot. Need to have it in a 16-bit slot to do so. Just posting this here so others can find it with google (as I couldn't). I was trying to get the Intel Etherexpress...

I assembled the GW rev 4A board from the kit, and it worked great with the supplied BIOS (1.1.5), booted from an MS-DOS CF created on another xt-ide board running 2.0.0b3. My other xt-ide cards are running 2.0.0b3 R618 with the 32k ide_xtl.bin. I used the GW card at both 0x300 and 0x3E0...