The first sound is that of the sound chip with uninitialised data. It shuts up only once the OS ROM gets around to writing data to it.- master beep is a prologned then stops - do vsync/hsync play a part in determining how long this could be?
The green coating is the solder resist. This can flake off on its own. It coming off on its own does not affect the functioning of the board.- On the underneath of the pcb, and in a couple of other places, I noticed the 'green' coating had gone and revealing the silver tracks more so around the crtc. Not sure what would do that but the battery did leak, maybe that is some damage.
The battery pack should not have been mounted on the board. Most of the time, unless the computer was stored on its end, a leaking battery pack would not leak onto the board.
Without a battery to maintain the configuration settings, the various configuration settings will be random at every switch on.- no battery connected so cmos will be in unknown state?
You need to reset the configuration settings at every power up:
Yes, I know you won't see the message. So just wait for 20 seconds.Power up the computer whilst holding down the "R" key. Keep the key down until the message CMOS RAM reset, press BREAK to continue is displayed.
Then press CTRL + SPACE + BREAK to get to the "This is not a Language". If the display was working, you could then set up the configuration settings. For example, so that it "boots" to BASIC.
Random configuration settings can affect the display, as the position of the picture on screen is one of the settings. The MODE will also be random until you perform the reset.
Pressing BREAK will not clear the configuration settings.
Mark
Statistics: Posted by 1024MAK — Fri Apr 05, 2024 7:33 pm