[Coco] Re: silly question about ?OM/?FC errors

[Robert Gault]

If you have a Coco3 that runs in RAM, you can POKE out the DK at $C000 
and reset the Coco to Extended Color Basic 2.0.
POKE&HC000,0:EXEC&H8002

If you are using a Coco1 or 2, it will be necessary to transfer all the 
ROM code to RAM so that you are in 64K RAM mode. Then the above will work.

In general, if you are causing Basic to start programs at $600 because 
you want to run tape based programs that require the extra memory, there 
is little chance that a disk command will be issued. Clearly a cold boot 
is required before you do any normal disk I/O.

Torsten Dittel wrote:
>> Now even if you have a disk system but don't want to use any disk 
>> commands, you can ....
>> POKE&H19,6:POKE&H600,0:NEW:PRINTMEM
> 
> 
> Isn't that dangerous if you've been using a disk right before and (by 
> accident) type in some disk commands? Two things could happen:
> 1) the FAT or DIR structure is destroyed by writing back some garbage 
> (not shure about that)
> 2) your BASIC programm in memory will be destroyed (more likely) by the 
> disk buffers overwriting memory at &H600
> 
> However, I remember there was a way to do some kind of "soft" coldstart 
> in just Extended Basic even with the disk contoller installed by a 
> sequence of POKE and EXEC.
> 
> Torsten
> 
> 
>