zx-81

You should get a menu to select the games at power up. It happens that at power up, a game is started (instead of the menu). I have seen that on adam computer, but not on coleco. If it is always the same game that is started, then you can always put the rom menu at that particular location in the address space of the eeprom. If it is random, then it might be a faulty pcb or bad solder. What i have seen as well is a faulty transistor (or wrongly soldered, with drain and source swapped). In that case it can also provide a wierd boot screen with colecovision letters and random characters below.

You can find some on thepihut dot com (This is where i bought mine).

@OriginalJohn : For the parts i have used the following : - 74HC574D - 74HC688D - 74HC541D For the resistor 10k Ohms and for the Transistor model i have used is a BS170. Be careful that some of the BS170 may have the drain and the source swapped compared to what is used on the 63in1 PCB. The symptoms are simple in that case : when you select a game from the first bank, it is actually failing as if you had no cartridge inserted (boot logo of colecovision with the message of the missing cartridge). The solution is just to swap the transistor or to solder it on the other side of the card. @Fabriciotm Yes, i know that issue, actually i had to modify manually those roms (Pacman, Popeye, etc ...) to be compatible with the 63in1. In those games, they are accessing the address range 0xffc0 to 0xfffe that we are using for the bank switching and it is messing up everything. What i did is to modify those roms to relocate the portion of data located in that address range and to move it somewhere else in the rom and to modify the binary code accordingly. You can PM me if you need more information.

Just to let you know that my good friend buzz has provided a new version of the 63in1 with the gerber files : http://buzz.computer.free.fr/index.php?post/2013/01/22/ColecoVision-63-in-1-SMD There is also a small software running under windows to build the two images required for that card : http://buzz.computer.free.fr/index.php?post/2023/03/03/Coleco-ROM-Builder Zx

@repetto74 glad to see it is working fine.

Hi Repetto74, You need to use a 1k resistor (10k is too high). Zx

Hi zCRP, We didn't put in place any reset mechanism to return to the menu. You have to switch off/on the console to get the menu working. Hi Querubin, The loader is located in the last 32k block of the second eprom (so at the end of the total address space of the two eproms). If Jungle Hunt starts (located at position 31), and you have flashed properly the two binary files properly, then there is most likely an issue with the selection between the two eproms (as if the clock enables of the two eproms were not properly working). So i will look at the PCB : - the pin 14 of the 74HC574D - the Clock Enable of the two eproms (pin 22) - the transistor BS170 used to do an invertor