Just writing down some quick notes for converting a PC98 V13 to run on a ATX PSU. This is especially useful if you are in a 230V country.
These use essentially a AT power supply, with an additional 3.3V connector. This is apparently also used on some standard PC’s, see this page which describes it towards the bottom.
The PSU is the same size as standard “small” ATX power supplies, which is 150mm (W) x 86mm (H) x 140mm(D). For the replacement PSU, make sure to find something with suitable power placement to fit the holes in the case. Modern PSU’s will usually have different fan placement, so you might have to track down some older ones.
The V13 uses standard AT for the main two connectors except:
- -5V is not populated
- PG (power god) is not populated
This means that the cabling is as follows:
- Black = GND
- Green = 3.3V
- Red = 5V
- Yellow = 12V
- Blue = -12V
I simply grabbed two AT->ATX power adapters and moved one of the AT cablings to free slots for 3.3V and GND in the ATX adapter. One GND pin is unpopulated, but that should be fine (and does seem to work well).
The (probably nicer) alternative is to simply remove the cabling from the original AT power supply and crimp ATX pins on those, to get the colors completely right too.
For power, rip out the original AT powr wiring and hook up the blue and white wires to PS_ON and GND on ATX. This will make the PSU work similar to the original one.
