v836 wrote: ↑
Sat Apr 23, 2022 12:23 am
First, I hope you have a better weekend.
Industrial computing is one of the applications for our software, so yeah I got a kick out of you saying these aren't that.
250 hours is barely scratching the surface but enough to settle in to whatever steady state it should find itself in. In my world a machine that has inherently limited uptime just for thermal characteristics is a broken machine, and I'll fix it till it isn't broken.
At any rate I suspect you're right about the cause. I've added passive cooling to the new chip just as a precaution, the heatsink warms right up so the heat transfer seems to be effective. I'm just using thermal adhesive (not tape which is near useless and possibly counterproductive). Thanks as well to the other poster for the reminder to look at it in context of whatever else is on the bus, actually that gave me some other ideas.
Thanks, a little better today.
Machines from this era are pretty bad thermally, I just fixed a VIC-20 and every single IC is hot to the touch within a minute of powering on. The VIC chip was marginal, and that was hottest of all. My 8 bit Ataris are much the same, but seem to have more thermally resistant chips. Commodore did use a lot of MOS chips, which are generally regarded as quite unreliable.
I suspect you had a similar scenario with the WD1772. Unfortunately these machines were almost disposable, and built to a low price, so I doubt thermals were even a consideration, so whilst I get what you're saying about steady state, it might be a bit of a stretch to have an ST manage it unassisted!
It's amazing that any of these machines run at all at 30-40 years old, but I'm glad they do
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...