A1200 board boot-up problem

[FB_mach2]

Hi all,

I recently got an A1200 board and tried to make it boot by attaching the
power adapter and an RCA cable to the composite output.

After switching on power supply, I can see a grey screen during a few
seconds, then video sync is lost for about 1 second, and the cycle repeats.
So we have:

Grey screen during a few seconds,
loss of video signal for about 1 second,
Grey screen during a few seconds,
loss of video signal for about 1 second,
......................

There are no peripherals attached to the board (no keyboard, no floppy
drive...). Of course kick ROMS are present.

Does anyone know how to solve this trouble???

Thank you for your help

FB_mach2

[FB_mach2]

Yes I agree, it's not mandatory to have keyboard connected to make the system boot. Built-in keyboard doesn't have any controller (the component is part of the mainboard).

I don't know if floppy drive connection is mandatory or not...

What's the bahaviour of the system if ROMS are bad or badly inserted??

[FB_mach2]

OK, so autotest is performed by custom chips but the program displaying color codes is located in the ROMS.

So the best for me is to try to plug another set of ROMS.

Are the kickstart ROMS standard chips (like AMD27C010 or AMD27C040) or are they commodore specific??

[FB_mach2]

If the board is powered without floppy connected, what message will appear on
screen??? The standard one asking to insert the workbench disk??