Anyone ordered the 2.01 cpu rom from marco? I installed it and it flashes the leds L202 and L204. replacing the original 2.00 rom, all works. I made sure to put the notch down as indicated by the position of the original chip + pcb layout marker...

the stern pdf
http://www.sternpinball.com/downloads/IO_Power_Driver_Bd.pdf

says
L202 - is a 20v line but does not say anything about flashing

L204 - LED L204 shows the reset state of the I/O Board. If this LED is not lit either the 5v DC is below 4.75v or the CPU/Sound Board is holding the I/O in reset. If the LED is flashing this means that the watchdog is not being feed by the CPU/Sound Board and the I/O is oscillating into and out of reset. If the LED is continuously on the board is out of reset and communication from the CPU to the lamp matrix is confirmed. Testpoint Blanking is the actual reset signal on the I/O Board. A low voltage indicates that it is in reset this will turn off all Solenoid (Coil) Drivers, Flash Lamps, Lamp Matrix Drivers, Auxiliary Outputs and Flipper Outputs. A high voltage indicates that it is out of reset and normal operation can take place.

Do you have to do anything when you swap a rom? or should it just work?

well I got it since I was getting some other parts at the same time and the rom was 10$ actionpinball is the only other place I know to get roms. do you have a storefront or something?

good to know it should of 'just worked'. for a moment I panicked that I static'ed some poor PAL or GAL that you can't replace anymore lol (I took precausions, honest!)