A600 NMI on 68k..

[xc8]

Hi,

As I want to put an NMI button on my A600, I had the idea to put a PLCC socket on the top of the 68k (like some accelerators) and wire on it the NMI button.

(justo to avoid "kill" the 68k if I solder the NMI button cables directly on the IPLx pins of the 68k)

So, my question is, are all the PLCC 68pins sockets suitable for this?
I mean if the MC68000FN8 is "standard" size and any PLCC 68pin socket (there are some on ebay) could be fit on the top of this. Or do I need a "special" cpu socket for the 68k of the A600??

Also, I have the idea to put very small probe clips on the IPLx pins of the 68k (to avoid any damage caused by the soldering) but I don't know if I can find such small proble clips in UK .. (if you know please let me know).

TIA

Chris

[rkauer]

Any PLCC socket with the right number of pins can used, SMD-intended or trough-hole.

But the MC68000 does not support an external MMU, nor FPU.

[xc8]

Originally Posted by rkauer

Any PLCC socket with the right number of pins can used, SMD-intended or trough-hole.

But the MC68000 does not support an external MMU, nor FPU.

obrigado amigo!!!

just i will wire there the NMI !

chris

[coze]

Originally Posted by rkauer

But the MC68000 does not support an external MMU, nor FPU.

Erm, I read and read again and still miss the point where the OP mentioned the MMU or FPU

[xc8]

Originally Posted by coze

Erm, I read and read again and still miss the point where the OP mentioned the MMU or FPU

maybe to prevent me to do dangerous experiments

[xc8]

ok, the NMI button for A600 is ready!

I only had a problem with the PLCC socket, its not very tight fit with the 68k..
i wonder how the accelerators for the A600 manage to fit on the 68k.

Enjoy the hardware pr0n!

chris

[tonyyeb]

Sorry to sound dumb... but what is this? What is NMI?

[musashi5150]

When clicked the button interrupts the CPU and calls whatever routine has been installed at autovector 7. Usually this would be used for a software debugger such as HRTMon or ActionReplay IV.

Great for cracking, training or debugging your own code

[xc8]

Non Maskable Interrupt Button (aka level 7 interrupt). its used for debug like to "break" a running program and go to debbuger/monitor (like Hrtmon or Action replay) screen.


chris

[coze]

hey chris ! So you have hrtmon or AR Rom in the kickstart ROM ? is it a 1 MB chip ? A600 has extra address line for 1 MB ROM ?

[musashi5150]

I'm not sure that's possible. The debugger is usually loaded into memory before starting the program to be debugged. ARIV stays resident after loading. HRTMon doesn't but can be booted from a special floppy before running another floppy based game/demo.

HRTMon sits permanently in my user-startup

[xc8]

as musashi5150 wrote, I only can load the HRTmon "manually". its not inside the ROM.

BTW, ARIV is AGA only AFAIK so not usable on the A600.

In fact (a bit out of topic) I made the NMI button in order to play with the HRTmon when I load games via the WHDload, but everytime the WDHload complaints that needs more ExpMem and stops..(i have 2MB chip and 2MB Fast (pcmcia SRAM))

chris