Atari Jaguar ROM switcher
Seems like I’m getting more and more a console-fanatic, as I found myself fetching a Atari Jaguar from the post some weeks ago! Digging through resources for this console around the net, I came across with JagOS and BJL. Despite not being much of a coder, I thought maybe a simple boot ROM switcher would be of some use anyway. With simple I mean a circuit where the Chip Enable (CE) signal from the CPU is routed through a SPDT switch to two different boot ROMs. Prior powering up the system, one of the ROMs is selected by flicking the switch.
Not much to this mod really, all in a couple hours of work. Desolder the original ROM, solder in a socket, make a adapter board for the boot ROMs, install switch to control CE routing and program the additional ROM with JagOS..
.. or well, the top halve of the case did need a bit of reworking thanks to yours truly winging the design without any measurements. Luckily the switcher board did fit in so I didn’t have to redo it :). Now then, a RGB cable for this console would kick ass..
2013-09-15, ERRATA: Apparently also _OE (pin 24) needs to be switched, otherwise there’ll be signal conflicts if both ROMs are installed. I’ll get this post fixed and do a new set of photos as soon as I can. Sorry!