Thank you once again Mr. Dinoman. I followed your directions and in exactly 15 seconds the self test message comes on; I never get a RAM clear message. I don't doubt you a moment, and certainly know nothing of the machines and have only a layman's understanding of computer electronics. I did copy the verbiage from the manual, not for argumentative purposes but to explain my question about the RAM clear chips. Perhaps somewhere along the line I've damaged the PCB, though I've been extremely careful. One time recently while powering up, I did hear a scratchy attempt at music and sound....then back to the muted click. When I remove the hopper, I see a blinking digital display on (I believe to be) the SIS SIB/2 PCB. I get a flashing dash and appears to be a 1. Trying to throw as much info as I can hoping something will help.
Bruce
Special RAM Clear Security Procedure
Overview
Some jurisdictions require a special RAM clear security procedure. Machines with a “02†in the GAL denomination IC code label require using the following special RAM clear security procedure.
Turn off machine power, Remove the two common main EPROMs. Install two RAM Clear EPROMs. Turn, and leave, the reset key switch to the on position. Depress and hold the TEST button located near the main power switch. Turn on machine power keeping the TEST button depressed. When the message “ALL DATA W/O SETTING WILL BE CLEARED†displays on the VFD, release the TEST button and RESET key switch. Turn power off and replace two coming main EPROMs. Turn power on.