[Coco] Speech and Sound Cartridge under NitrOS9

[K. Pruitt]

I took the code out which sets the sound multiplexer to cartridge input and 
now it works. I don't know why. I don't have a clue what a sound multiplexer 
is but the addresses are in the PIAs. Ongoing fun with the CoCo.


----- Original Message ----- 
From: "K. Pruitt" <pruittk at roadrunner.com>
To: <Coco at maltedmedia.com>
Sent: Wednesday, December 30, 2015 8:34 AM
Subject: [Coco] Speech and Sound Cartridge under NitrOS9


> Is it at all possible to operate an UNMODIFIED speech and sound cartridge 
> under NitrOS9 Level 2?
>
> Here's what I am doing... I am halting the interrupts and dropping the 
> CoCo down to 0.89Mhz. This allows the Speech and Sound cartridge to speak 
> under Level 2.
>
> I'm happy to post the code I am using, but it's just the BASIC listing 
> starting on page 5 of the device's manual translated in to assembly.
>
> This works fine under stock Level 2 OS-9 but leaves the system unstable. 
> It works on NitrOS9 fine as far as speaking goes, but it never gets to the 
> point of turning the interrupts back on and returning the CoCo to 1.79Mhz. 
> A reset is required to recover from the hang-up as the interrupts are off
> .
> By the way, I use this method of turning off the interrupts and dropping 
> the CoCo down to 0.89Mhz quite successfully with the Plug 'n Power 
> controller. I've been running it for a couple of years now under NitrOS9 
> and is hasn't failed me once or caused any issues with the OS.
>
> I installed the speech and sound cartridge drivers to play around with 
> them (I assume they are for the modified cartridge) but when they are 
> installed NitrOS9 won't boot for me. If I just load the drivers I get an 
> error 207 when I try and send something to them. This takes place no 
> matter if the Speech and Sound cartridge is plugged in or not.
>
> I'm just screwing around with the sound and speech cartridge here and am 
> just curious if what I an trying is even possible to pull off. If anybody 
> would care to chime in on the speech and sound cartridge I would really 
> appreciate the input.
>
> Thanks
>
>
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