[Coco] OS9 vs RSDOS disks

Luis Antoniosi (CoCoDemus) retrocanada76 at gmail.com
Thu Jun 13 22:26:09 EDT 2013

every MSX programmer knows that wrong bits to the register 7 of the PSG
could cause permanet damage to the chip. Later custom integrated chips (aka
MSX-Engine) solved this issue.

The same PSG is used in the coco's sound card/speech.

On Thu, Jun 13, 2013 at 10:16 PM, <billg999 at cs.uofs.edu> wrote:

> >  Depending on you coco version, just type "dos". If it's an OS9 disk it
> > will
> > boot. otherwise, it won't or the disk is corrupted.
> Not all OS9 disks need to be bootable.  I got software distributions
> (like the C compiler) on OS9 formated disks with no OS on them.
> >  Another way is to "DIR" the thing an see what you get. After that, type
> > "dos".
> See above.  :-)
> >  Anyway, the only way you can hurt you computer is by striking it sharply
> > with a sledge hammer.
> People believed that at one time, but it is not necessarily true.
> I think the 6809 has an HCF instruction.  I agree that there should
> be a way to look at the data on a disk and tell what kind of disk
> it is.  But then, just telling the difference between OS9 and DECB
> is only useful if you know for a fact that you have no other format
> flopies laying around.
> bill
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Long live the CoCo

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