ocr: SID PIN DESCRIPTION (Continued) A0-A4 (Pins 9-13) These TTL-level inputs are used to select one of the 29 SID registers. Although enough addresses are provided to select 1 of 32 registers, the remaining three register locations are not used. A Write to any of these three locations is ignored and a Read returns invalid data. These pins are normally connected to the corresponding address lines of the microprocessor so that SID may be addressed in the same manner as memory. GND (Pin 14) For best results, the ground line between SID and the power supply should be separate from the ground lines to ...
