> For the Q40, low RAM is either read only or write only and it is
> normally read only. To write to low RAM you must poke a byte address
> (I think any value will do, but I use $FF). Interrupts must be
> disabled while doing this. Why?
>
> Don't know anything about the Q40 hardware.
> My guess: Interrupt vector is located in the low ram ... and if next
> access between the st to set the RAM access to WRITE, and the
> interrupt occurs just after this instructions - who knows which vector
> (value) is fetched on the access to read instead of write?
>
> Jochen
