680x0 - User-Defined Vectors

[Telboy]

I have some spare 68020 CPU's and I thought I should do something with them, so I am writing a monitor program and got some simple games pong, Othello etc.

However, I want to make use of the 192 user-defined vectors but I can not find any instruction to trigger using them e.g. I tried 'trap #64' but that defaults to trap #0.

I tried hard coding

Code: Select all

#define trap64 __asm__ __volatile__(" .word 0x4E80")

but that triggers illegal instruction.

So if anyone has any information, I would be grateful.

Thanks in advance

[czietz]

You cannot trigger exceptions 64 - 255 from software. Those are meant to be passed as (non-autovector) interrupt vector from some hardware component. For example, in Ataris the MFP (MC68901 multi-function peripheral) can trigger these vectors during an interrupt.

[Telboy]

Ok thanks....