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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: FB_mach2 on October 04, 2005, 10:31:39 AM

Title: A1200 board boot-up problem
Post by: FB_mach2 on October 04, 2005, 10:31:39 AM

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

Title: Re: A1200 board boot-up problem
Post by: _ThEcRoW on October 04, 2005, 02:54:31 PM

I think that you should attach a keyboard and floppy and see the behaviour.

Title: Re: A1200 board boot-up problem
Post by: Chain on October 04, 2005, 05:42:09 PM

it must works without kb and floppy

Title: Re: A1200 board boot-up problem
Post by: FB_mach2 on October 05, 2005, 08:40:37 AM

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??

Title: Re: A1200 board boot-up problem
Post by: countzero on October 05, 2005, 09:42:39 AM

Quote

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

you'll get the red screen of death.

http://www.amicue.org/TechStuff/amigaboot.html

Title: Re: A1200 board boot-up problem
Post by: orange on October 05, 2005, 10:16:30 AM

It should work without floppy too, I've got one that does.
someone said here that if ROM is bad you get black screen, because the program code for coloured test screen is in ROM.

Title: Re: A1200 board boot-up problem
Post by: FB_mach2 on October 05, 2005, 02:50:35 PM

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??

Title: Re: A1200 board boot-up problem
Post by: J-Golden on October 05, 2005, 05:01:11 PM

Quote

FB_mach2 wrote:
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??

WEEELLLLL, they ARE standard sizes, but you'd need a legall copy of the orig. ROMS, hardware to flash your new ones and oh, I think others have had problems when they use the wrong size (IE memory size) so use 256K ROMS.

J-Golden

Title: Re: A1200 board boot-up problem
Post by: FB_mach2 on October 07, 2005, 10:36:20 AM

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

Title: Re: A1200 board boot-up problem
Post by: orange on October 07, 2005, 10:52:24 AM

yep, the standard one. you'll have to wait long for it..

Title: Re: A1200 board boot-up problem
Post by: BadBigBen on October 07, 2005, 04:50:33 PM

attach a mouse to it...

upon boot up hold both mouse buttons down, if the early startup screen appears, then your roms are good... if it doesn't then you know they aren't...

and it could mean that your IDE port is shorted....