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During my short time playing with 30-40 year old machines, I keep running into different DRAM chips that may be the same as others, but it is sometimes difficult to find data sheets on some of these. My most recent example is a Quadram Quadboard ram expansion board that I picked up from eBay...

I have built the dramduino tester and have gone through the memory on my 2nd 5160. I found 3 definitely bad chips. The (maybe) good ones were populated in banks 0 through 2 and the switches set to exclude bank 3. I have the Landmark diagnostic BIOS installed. I am aware that it is not the...

Good Day all. I recently added my long time want items to my collection (pile of misfit toys). We have an IBM XT 5160 with dual floppies (no HDD or controller), 256 kb of memory on board (but only counts to 64kb), a seemingly original CGA & parallel card, the floppy controller and a Model F...

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 the seek on boot, but couldn't access the...

Now that I am retired, I find that I have the time to attend events such as VCF weekends. Unfortunately I cannot justify an $800 weekend trip to the Jersey Shore for the hope of hoarding more out of date tech. I was not able to attend the VCF event in Atlanta last year, but would love to go in...

I recently added a DX equipped 486-VC-HD motherboard to my collection. Ebay provided a small form factor case with a equally small ATX power supply. The PSU does not have -5v, but throwing a multimeter at the pins shows that the output voltages are good. I picked up an adapter from ATX to AT...

I've recently installed a XT-IDE card with a CF adapter in a T-1000 TL. I have a CF card with DOS 6.22 and several installed files. I'm trying to make a 720k boot disk, because 720k is the only drive in the system. When I try to transfer the system, I get a "Sector Not Found" error and a...