[Coco] megaread HOW TO ?

[Dave Philipsen]

But ‘no-halt’ has to do with whether the HALT line gets asserted during disk access. I have heard, though not verified, that the CoCoSDC does have a no-halt mode that is used under OS9. The only reason it uses HALT is to retain compatibility with DECB ROMs. 

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> On Apr 5, 2020, at 11:12 PM, David Ladd <davidwladd at gmail.com> wrote:
> 
> On Sun, Apr 5, 2020 at 9:32 PM Allen Huffman <alsplace at pobox.com> wrote:
> 
>>> On Apr 5, 2020, at 8:50 PM, coco at jechar.ca wrote:
>>> 
>>> So if you were running a BBS you would do much better with the Hard
>> Drive.
>> 
>> 100%. I seem to lose characters when I type using DriveWire, and also the
>> COCoSDC though I am told the SDC should be no halt..
>> 
> 
> The SDC is not a No Halt controller even in LSN(HDD) mode as it is still
> using SCS line to control its addressing which means it has to shut IRQ's
> off to make sure the MPI slot doesn't get changed.
> 
> 
> 
>> 
>> Anyone know for sure? Who wrote the HD drivers for SDC?
>> 
> 
> As far as I know Darren wrote the SDC driver for NitrOS-9.
> 
> 
> 
>> 
>> --
>> Coco mailing list
>> Coco at maltedmedia.com
>> https://pairlist5.pair.net/mailman/listinfo/coco
>> 
> 
> 
> Sincerely,
> David Ladd
> ***END OF LINE***
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