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bally s5500 safe ram

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brooker:
hello  how i do safe ram in bally s5500

Harp:
SafeRAM™ Clear Procedure
For a Complete, Full, or Partial SafeRAM™ Clear,
turn the machine power OFF. Unlock and remove the MPU
Assembly. Remove the Main EPROMs from U12 and U15
and replace them with the corresponding Clear Chips.
Upon ensuring that the MPU Assembly is firmly seated
into the Backplane Board, turn the machine power ON
while depressing the appropriate buttons.
Complete - Press and hold the PSEUDO COIN and
TEST buttons, then switch power ON. When the message
CH C displays in WIN PAID, release the PSEUDO COIN and
TEST buttons. The CH C message is followed by CL C.
Full - Press and hold the PSEUDO COIN button, then
switch power ON. When the message CH F appears in
WIN PAID, release the PSEUDO COIN button. The CH F
message is followed by CL F.
Partial - Switch power ON. The message CH P
displays in WIN PAID. The CH P message is followed by
CL P.
If an error was detected during SafeRAM™ Clear
as designated by E C, E F, E P in WIN PAID, repeat the
operation.
Upon a successful SafeRAM™ Clear, the button and
tower lamps flash. Switch power OFF and replace the
SafeRam™ Clear EPROMs with the corresponding
Mains. Replace MPU Assembly and switch machine
power ON. The machine will enter a Reel Calibration
procedure whereby the home position is recorded in
SafeRAM™. For tilt-free operation it is important that the
procedure completes without interruption

brooker:
ok thank.... what is the difference between  [size=0px] a Complete, Full, or Partial SafeRAMâ„¢ Clear[/size]

Badbaud:
You always want a full clear otherwise the RAM may still have junk code in it.

A partial clear usually means your finger slipped of f one of the buttons you were holding down.

If you don't hold down both buttons that is what you usually get.

If you are sure both buttons were held down you may want to try swapping the two RAM chips in their sockets and try clearing again.

brooker:
Ok

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