[Coco] CoCo-SDC card on a Dragon64

[Barry Nelson]

You probably need to do the equivalent to these pokes and execs from a machine code program in ram, otherwise you are calling the rom while it is being switched out. 

On Jun 24, 2015, at 1:18 AM, coco-request at maltedmedia.com wrote:

> Date: Tue, 23 Jun 2015 10:09:48 +0200
> From: "Pere" <psergm at gmail.com>
> To: <coco at maltedmedia.com>
> Subject: [Coco]  CoCo-SDC card on a Dragon64
> Message-ID: <9987298B88AC459E809D072EDF9288E4 at DELL17>
> Content-Type: text/plain; format=flowed; charset="utf-8";
> 	reply-type=original
> 
> Hi Darren,
> 
> so this is the RAM byte that contains the SDC bank in use.
> But we cannot just change its contents. Every time I have done
> it, the system has hanged.
> Probably there are some more things to do ...
> 
> I have tried:
> POKE &HFF4B,3: POKE&H71,0: EXEC &HB3B4
> Being the last two, the normally used to invoke a coldstart, but it
> hangs anyway too.
> 
> I don't know what else should be done to get something like
> RUN @3 on a Dragon with DOSPlusExtended, so without your SDC-DOS
> 
> thanks in advance
> pere