parent Bank Switching
For a discussion and tutorial on CDFJ see SpiceWare's Blog
Stella Emulator Comments
CDFJ bankswitching for Atari games using ARM/C code.
There are two variants supported:
1) CDF/CDFJ - initial scheme with 32K ROM and 8K RAM
2) CDFJ+ - support for larger ROM sizes (64/128/256/512K) and RAM sizes (16/32K)
Features:
32 fast fetchers
2 fast jump queues
1 parameter queue
3 channel digital audio/1 channel sampled sound
7 banks (4K) of atari code
4K display data (16K and 32K available with CDFJ+)
Note that for CDFJ+, the same driver is used for all RAM/RAM combinations.
It is left to the programmer to ensure that only the available RAM/ROM on the target device is used.
Bankswitching Note:
CDF/CDFJ uses $FFF5 through $FFFB (initial bank 6)
CDFJ+ uses $FFF4 through $FFFA (initial bank 0)
The letters CDFJ stand for Chris, Darrell, Fred, and John.