Got back to this recently. I convinced myself that the interrupts were working correctly and I have a slot manager kind of problem. Through some distorted logic I decided that putting a cheap PDS iisi video card in would force slot manager and the vertical blanking manager to sit up and take notice of something different...
Long story short, I got the damn thing to boot and bugger me, the SE30 onboard video (slotE) appears in 4 different slots. (E,A,6,2). It forces the poor old thing to think there's 4 screens attached, which has some predictable nasties when you move the mouse pointer or windows off the screen edge...
So it's got to be an address decoding problem for the video declrom.. I just can't find out where the problem is.... yet.... I've swapped all the PAL's and anything else that's socketed...
Who can tell me why microbug only works in 24 bit mode on the 30? The address translation to figure out where the slot memory space lives is seriously messing with my head...
I've ordered one of Dougs romsimm programmers, so I'll put a si rom in there and see what happens..
Long story short, I got the damn thing to boot and bugger me, the SE30 onboard video (slotE) appears in 4 different slots. (E,A,6,2). It forces the poor old thing to think there's 4 screens attached, which has some predictable nasties when you move the mouse pointer or windows off the screen edge...
So it's got to be an address decoding problem for the video declrom.. I just can't find out where the problem is.... yet.... I've swapped all the PAL's and anything else that's socketed...
Who can tell me why microbug only works in 24 bit mode on the 30? The address translation to figure out where the slot memory space lives is seriously messing with my head...
I've ordered one of Dougs romsimm programmers, so I'll put a si rom in there and see what happens..