river9999uk Posted March 2, 2021 Share Posted March 2, 2021 Guys. I have narrowed my colecovsion fault down to the BIOS. I borrowed a friends BIOS and my console works with his in it and does not with mine (and visa versa). I'd like to download and write a new bios for mine but need a dummies guide (and equipment needed). I like to play with this sort of thing so I am up for the challange! Any help, links etc etc are most welcome ? Quote Link to comment Share on other sites More sharing options...
+5-11under Posted March 3, 2021 Share Posted March 3, 2021 Here's part of it: Quote Link to comment Share on other sites More sharing options...
SiLic0ne t0aD Posted March 3, 2021 Share Posted March 3, 2021 I think Console5 or one of them sells a 'fast-boot' or 'press-fire-to-boot' bios. I'd socket that chip and throw one of those in there.. It's a lot less painful than waiting through that 10 second title screen. [emoji28] Quote Link to comment Share on other sites More sharing options...
NIAD Posted March 3, 2021 Share Posted March 3, 2021 Putting a socket in would be the smartest decision especially if you decide to go with a Modded BIOS. While modded BIOS chips are a great option, there is absolutely no way that EVERY ColecoVision cart (Legacy, Homebrew, etc.) is completely tested with the Modded BIOS, so no way to know if the modded BIOS code might cause issues with a game or games. So always have an original BiOS chip on hand and easy enough to swap in/out with a socket in place. 1 Quote Link to comment Share on other sites More sharing options...
river9999uk Posted March 3, 2021 Author Share Posted March 3, 2021 Thanks guys...I'v got a programmer and some eproms on the way so lets see how I do. Will report back... Quote Link to comment Share on other sites More sharing options...
river9999uk Posted March 7, 2021 Author Share Posted March 7, 2021 Ok fell into the trap! I programmed a 27c64 (28pin) only to find out that the TMS9929A is 24 pin so the new BIOS wont fit ? Does anyone have the pinout of the TMS9929A so I can make an adaptor for the 27c64. Thanks Quote Link to comment Share on other sites More sharing options...
+5-11under Posted March 7, 2021 Share Posted March 7, 2021 Not TMS9929A... . Doesn't the main board have extra holes so the 28 pin will fit? Check out the guide. Quote Link to comment Share on other sites More sharing options...
river9999uk Posted March 7, 2021 Author Share Posted March 7, 2021 Yes sorry meant the TMS4764NL. The PAL rev D board does not have the extra holes so you cant do the small mod and put a 28pin socket in ? Quote Link to comment Share on other sites More sharing options...
river9999uk Posted March 8, 2021 Author Share Posted March 8, 2021 I have been supplied some great info showing that looks like you can use a 2364 to 2764 adaptor (28 pin to 24 pin). I have ordered one to take a look. Quote Link to comment Share on other sites More sharing options...
a7mag3ddon Posted June 1, 2023 Share Posted June 1, 2023 Hi, did you ever get this fixed? I now find myself in same position. Ordered a fire to skip bios 28pin and my pal board is also Rev D and has 24 pins. Quote Link to comment Share on other sites More sharing options...
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