I would probably be more inclined to initially suspect something faulty to do with the video DAC circuitry or that rather than initially assuming it's the ASIC. Of all the SAMs I've had sent my way for repair I've yet to see a faulty ASIC - although of course there is always the first time!
But initially, easy enough to check the video DAC circuitry and the PCB itself - i've seen a few boards with failed solder joints or duff vias (the plated holes joining the top and bottom copper layers) which have failed due to age and cause a whole host of problems. If you'ld like the ASIC or main board checked I'd be happy to help. Colin ===== Quazar : Hardware, Software, Spares and Repairs for the SAM Coupe 1995-2009 - Celebrating 15 Years of developing for the SAM Coupe Website: http://www.samcoupe.com/ ----- Original Message ----- From: "Thomas Harte" <[email protected]> To: <[email protected]> Sent: Friday, February 20, 2009 12:02 AM Subject: Re: Loss of colours It seems likely to be the bright signal. Sam the Juggler runs with three shades of blue in the sky where there should be six, and the red square behind Sam's right arm is a solid red whereas in Sim Coupe it contains two separate red colours. Furthermore, the top of Sam's left leg blends in with the white square behind it, when it should be a touch darker. Assuming this diagnosis is correct, is there anything I can do that is likely to be easier and/or cheaper than simply obtaining a Sam with a functioning ASIC? On 19 Feb 2009, at 20:42, LCD wrote: > Thomas Harte schrieb: >> My next Sam physical hardware question — is there any reason why my >> Sam might find itself merging similar colours? Check out: >> >> http://members.allegro.cc/ThomasHarte/temp/Image(072).jpg >> >> That's how the first screen of Prince of Persia looks from both the >> SamCo Birthday disk and Blitz 8 (thought I'd check, since the >> birthday disk one is clearly an earlier version of the demo and, >> for all I knew, predates the game being completed). It's not a >> great photograph, but it does demonstrate the point. The walls on >> the TV are as they appear in that photo, a single solid blue. The >> effect is the same through both the aerial socket and RGB SCART, >> with or without the Trinity plugged in. I have no other hardware >> attached. > Maybe the Bright-Signal of your ASIC chip is gone, or there is a > short circuit in the DAC for blue output.
