Stage 1 success – using the NV1 PSU, with a considerably new PSU wiring loom, the SPARCstation-10 powers-up and initialises, ready to boot!
As can be seen from the graphics screen, it’s running happily:
Yay! You know, this project might actually lead somewhere…
It seems OK with a pair of 60 MHz SuperSPARC CPUs, a single memory DIMM, a couple of SCSI cards and a basic GX LEGO (“Low-End Graphics Option”) graphics card. There is still a lot left to do (mounting the PSU in a drive-bay, fitting a PSU fan, restoring the main chassis fans, and so on and so on), but I’m feeling much happier now – I thought for a while that it just wasn’t going to work at all.
The new cable-loom has a little trick in it: the sense wires are the thin twisted-pair wires that can be seen in the picture. The +ve and -ve sense lines should be twisted together so that any electrical/magnetic interference effects both lines the same way, thus preserving the actual differential signal level.
The sense lines I used are much thinner (AWG-24) than the power-lines, so that they have more resistance, thus persuading the PSU to boost output voltage level a little more than usual – the SS10 nominally requires 5.1V, not 5.0V.
As this is the “spare” SS10, I don’t have an available disk drive with an operating-system already installed, so the next job will be to try and install an OS before the PSU overheats – there are no fans attached yet!
PS: Bonus points available to anyone who can identify a little problem with this SS10 itself, due to it having been in storage for a long time…