[Coco] os9/drivewire driver problems

[Lothan]

Sheesh... I can't add today. You're right $04 + $02 is $06. I agree the 
other constructs don't make sense, but the result should be either logically 
OR'ing the register postbyte codes such that PULS A,B,D is the same as PULS 
D or PULS A,B (assuming it's just blindly picking through the 
comma-delimited register list) or raising an error that the list doesn't 
make any sense.

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From: "Robert Gault" <robert.gault at worldnet.att.net>
Sent: Sunday, November 08, 2009 11:24 PM
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Subject: Re: [Coco] os9/drivewire driver problems

> Lothan wrote:
>> Given the layout of the register postbyte, PULS A,B is exactly the same
>> as PULS D (e.g. the postbyte is $05 in either case), so PULS A,D and
>> PULS B,D and PULS A,B,D should in theory all compile exactly the same as
>> PULS A,B or PULS D.
>>
>> Someone feel free to smack me with a clue stick if I have that wrong.
>
> No smack, but you might consider this.
>
> PULS A,B and PULS D both give $35 $06. So, the post byte is 6 not 5. The 
> other constructs don't make any sense and a good assembler should report 
> an error. After all, you are asking for an ambiguous action. What values 
> are going to be put in regs A & B if you ask for PULS A,D?
>
> EDTASM gives Register Error for a multiple pull/push of the same register.
>
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