Ruud wrote: > 1) What happens if you write to or read from registers > 46 ($2E)? Are > there any (undocumented) side-effects which could harm the c64 in any > way? The VIC-II will return $FF on read, and write has no effect. But note that the VIC-IIe has two extra registers, one (I think 3-bit) output port at $d02f and a 2MHz mode/test mode selection register at $d030. The $d030 register must be initialized with $fc for normal operation. Also, I've understood that the SuperCPU accelerator card misuses these addresses for something. > 2) Are there PRGs around using the mirror addresses of the VIC, > $D040-$D3FF? Yes, but they shouldn't be very common. Marko
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