The MAP instruction prevents each IRQ and NMI interrupts until a NOP instruction is run. All this and more may be seen in the routine for switching to the C65 1581 DOS reminiscence context. Notice that there is no such thing as a NOP or EOM in this routine. This prevents any interrupts occurring whereas the inner DOS is operating in its particular memory map. C000 ROM and bank CIAs again in. DFFx reminiscence accesses are to not the CIAs, however to the end of display RAM. DFFF with an additional 1KB of color RAM, which is in fact the last 2KB of the 128KB of most important RAM of a C65, and ______ therefore is 8 bit RAM, not like the 4-bit color RAM on the C64. D030 flag is primarily for making the 2KB color RAM conveniently available to the kernel when working with an 80-column, and hence 2,000 byte display screen. After all this leaves a couple of bytes spare at the tip which are properly used here to avoid wasting and restore registers when the stack cannot be used because memory is being remapped. The last interesting piece is to explore is the reset course of. C65: CPU reset entry level. Check for cartridge, else normal reset sequence. If a C64 cartridge is detected, then the standard C64 reset process is adopted. CFFF and jumping to the entry level there. BFFF and the DOS setup routine known as. Which means that I have to disassemble and look at these two ROMs as effectively I'm to fully understand what's going on.

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