ELITE SERIES USER MANUAL | THEORY OF OPERATION |
which maps into $C800-$CEFF, is intended to be used at this location. The second section is mapped into the slot-dependent location in the Apple memory as illustrated in the table below.
Slot Memory Address for EPROM ($700-$ 7FF)
0(not allowed)
1$C100—$C1FF
2$C200—$C2FF
3$C300—$C3FF
4$C400—$C4FF
5$C500—$C5FF
6$C600—$C6FF
7$C700—$C7FF
Fig. 7-2: Slot Dependent PROM Address Ranges
This slot dependent portion of the EPROM is always there. The mapped-in section, at $C800— $CFFF, is only there after an access to the slot dependent area. However, before accessing the expansion area a command must be given to turn off all the other ROMS that might be on the bus (an access at $CFFF) which also turns off the Rana EPROM. When the expansion RCA area is mapped Out from within the slot dependent ROM code, the following instruction fetch made by the 6502 will cause the Elite Controller’s RON to be mapped back in. This allows the slot dependent
