Tuesday, September 18, 2018

RiscPC 700

Poor old RiscPC suffered the common battery leak from the PCB mounted NiCd.

Sadly it caused some damage to tracks around the CMOS clock and memory.

The charging circuit for the NiCd was also damaged.

Things I know that work now:

* Charging - Replaced the failed 180R resistor with a through-hole type as I needed to also get power from the diode and the track had disintegrated. Not pretty.
* CMOS I2C - I watched the waveforms on the logic analyser.
* Sound & Video from VIDC


Battery replacement. NiMh hidden well away from the PCB


 Life! for the first time since 2009!


Little bit better!
Some more cleaning of SIMs & VRAM
Passable, but I think the VRAM needs replacing now.

Well, that's the most life I've had out of this recently, so I'm a bit happier with it. Still some way to go.

Next steps.  Some new RAM and VRAM.