Put a 10 or 22 uf on the reset connector Enviado do meu Tele-Movel Em 28/05/2016 18:38, "Richard Cini" <rich.c...@verizon.net> escreveu:
> All – > > > > I pulled my old PC/AT off the shelf to see if I could get Windows 1 > running on it (since I just located the Windows 1.04 SDK which I have > running in Bochs). It worked when shelved years ago, but it unfortunately > suffered some case damage from a leaky battery. No damage to the mobo or > cards thankfully. I replaced the battery with a 4-AA pack. > > > > Basically, the PC won’t come out of reset. I tested the power supply with > a load tester specifically for PC power supplies and it reports power_good > and all voltages look good on a meter. So far, so good. I dug out my ISA > POST diagnostics card which also has a PG tester in it. This reports no_PG > but I do see the reset pulse on the bus. Not sure why one would report OK > and one not. > > > > I have a spare generic power supply (which also tests good using the same > tester) and produces the same result. I have no cards installed but I tried > it with floppy/hard drives both connected or not connected. > > > > I traced the PG signal from the power supply through the 82284 clock > driver/ready interface chip and the PG is definitely there (transitioning > L->H on power-on) and RESET is transitioning H->L. > > > > Any recommendations on where to go from here? Does anyone > have an extra PC/AT motherboard they would be willing to part with? > > > > As an aside, would this have been a typical development machine? AT was > introduced in August 1984 and Windows 1.04 was released in 1987 so I’m > guessing probably. > > > > Thanks! > > > > Rich > > > > -- > > Rich Cini > > http://www.classiccmp.org/cini > > http://www.classiccmp.org/altair32 > >
