[Coco] Assembler modifications and a super 6309 processor

William Astle lost at l-w.ca
Tue Sep 8 20:54:47 EDT 2009

jdaggett at gate.net wrote:
> On 8 Sep 2009 at 11:55, William Astle wrote:
>> Something else I've found lacking in the 6309 is a means to stack the 
>> entire register set in the same order as interrupts do in native mode. 
>> Maybe a PSH/PUL variant with a 16 bit register bitmap or a PSHrALL and 
>> PULrALL type instruction? (It takes 3 instructions to do it currently, 
>> totalling 6 bytes and a further 3 instructions at 6 bytes to remove the 
>> registers from the stack.)
> William
> Something like the 68K where you have a PUSH/PULL instruction and a 16 bit postword 
> that has a corresponding bit for each register to push or pull? 

That would be excellent. Especially if there's a way to do it with a one 
byte opcode. My researches show there are 18 invalid single byte opcode 
values in the 6309 so I would think it would be possible.

> james
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William Astle
lost at l-w.ca

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