[Coco] Orchestra 90CC

[jdaggett at gate.net]

Kevin

Adding a FIFO would do nothing to improve the performance. Audio tones are 
genereated via the software in the 8Kx8 ROM. All the uP does is write to two 
addresses an eight bit data. The writes are to two 8 bit latches whose outputs 
have a 2R:R resistor ladder to perform digital to analog conversion. 

The way the progrma works the best method of improvement is to run the uP at a 
faster speed. Then the software would need patching for timing issues. 

james

On 27 Jan 2007 at 20:20, Kevin Diggs wrote:

>  With all the recent discussion of the 90cc, I thought I'd ask:
> 
> If this thing had had a FIFO and some logic to send samples out at
> regular intervals how much would that have aided performance? To ask
> another way, how much of a burden was it that the 6809 not only had to
> compute the samples but also had to deal with sending them out at the
> right time?
> 
> kevin
> 
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