B) Alright!!! My first post!!!
I've been tinkering with my PAL SEGA Master System Mk1 the past couple of days and after strapping on some S-Video, C-Video, audio jacks and 50/60Hz switch I thought, "Hey, what about livening up the inbuilt game factor" coz 'HangOn' is kinda dull. I figure by de-soldering the on-board ROM chip and popping in a 28/32 pin socket, then either sacrifice a cart for the ROM chip or even just program a compatible EPROM with the game of my choice, I could pop it into the socket and have a decent inbuilt game as standard.
Now, I haven't actually tried this yet so I dunno whether there are other factors that would prevent it from working. Also I noticed while taking apart numerous carts last night that the games seem to use either a 28 or 32 pin Mask ROM (not sure if there's any that use a larger chip again). The Mk1 SMS has a 28 pin chip in place for HangOn, but I noticed it has the additional room for a full 32 pin chip/socket left unused. There is also a factory soldered jumper wire just above the on-board ROM chip labelled "JP1". It looks like it might have something to do with using/not using the extra 4 pins and this is my main query, does anyone know whether I'd need to remove this jumper wire to let me use the full 32 pins??? (Maybe I should take a digi photo of the area in question on the PCB for those without an SMS Mk1 in front of them...tehehe.......hrmmm)
Any help would be great!!