Overview Features Coding Performance Forum Downloads Products OrderV4 Contact

Welcome to the Apollo Forum

This forum is for people interested in the APOLLO CPU.
Please read the forum usage manual.

All TopicsNewsPerformanceGamesDemosApolloVampireAROSWorkbenchATARIReleases
Performance and Benchmark Results!

Paula's Impact On AGA Bus?

John Heritage

Posts 111
07 Jun 2018 02:16

Hi folks - I'm curious -

How much bandwidth does Paula typically need for playing (MOD) music?  What % of the bus time does this translate to on OCS/ECS?

And is this "impact" on the bus 4x worse with AGA?  (i.e. because Paula still accesses the bus 16-bits x 7.16 mhz instead of the AGA bus of 32-bits x 14.32 mhz?)

Nixus Minimax

Posts 416
07 Jun 2018 06:13

Amiga-Sound typically plays 4 channels, 8 bits per channel, 15 kHz sampling rate. This means it takes 60kB/s out of 3500kB/s available. Effect: negligible.

Mallagan Bellator

Posts 393
09 Jun 2018 11:57

This is an interesting thought, indeed. Maybe Pamela would surely be a lot better when it comes to this

Gunnar von Boehn
(Apollo Team Member)
Posts 5483
09 Jun 2018 18:34

Lets look at PAMELA
peak usage:
8 Channel at 44khz with 16bit
=700 KB/sec
Memory Speed of Vampire2 = 700.000 KB/sec
700.000 KB versus 700 KB
= PAMELA needs less than 1% of bandwidth

posts 4