As a rule of thumb, tunes start at the end of the chip and count down. i.e. “Tune 0” is in the highest addresses on the chip or the top slot in a stacked bin. “Tune 1” will be the next lower slot. Some adapters have chips that can hold more tunes than there are address lines for switching.
TwoTimer: 27SF512 (00000/0FFFF), 2x 256kbit/32kbyte slots, idles in “high position”
- 8000/FFFF
- 0000/7FFF