Nama
Veteran Member
I have done some voltage reading suggested by dave_m on the 9216 masked ROM to try to determine what the exact pinouts are. I took reading from pins 18 through 21. I measured Pins 20 and 18 both from the 9216 and also with the 9216 removed from the socket:
Pin 21: ~4.73V
Pin 20: ~4.2V (fluctuates between 4.1V and 4.4V)
Pin 20 (from the socket. 9216 removed): ~4.2V (fluctuates between 4.1V and 4.4V)
Pin 19: ~11.96V
Pin 18: ~27.3mV
Pin 18 (from the socket. 9216 removed): ~7.9mV
While I was at it I took the power readings from the main power connector on the motherboard coming off the PSU
Pin 1: GND (and where I took my GND line from)
Pin 2: 4.92V
Pin 3: -11.74
Pin 4: 11.96
(these are listed in the SOL-20 manual as +5V+5%, -l2V+5%, and +l2V+5%)
Pin 21: ~4.73V
Pin 20: ~4.2V (fluctuates between 4.1V and 4.4V)
Pin 20 (from the socket. 9216 removed): ~4.2V (fluctuates between 4.1V and 4.4V)
Pin 19: ~11.96V
Pin 18: ~27.3mV
Pin 18 (from the socket. 9216 removed): ~7.9mV
While I was at it I took the power readings from the main power connector on the motherboard coming off the PSU
Pin 1: GND (and where I took my GND line from)
Pin 2: 4.92V
Pin 3: -11.74
Pin 4: 11.96
(these are listed in the SOL-20 manual as +5V+5%, -l2V+5%, and +l2V+5%)