one thing.
The player can play songs in 2 speeds, 50Hz, and 100Hz, does not matter of SID speed, ex if the speed of SID is 60Hz the player plays it on 50Hz.
1 Feb 8, 2012 3:18 pm
Re: sid player on Amstrad CPC 128k (7 replies, posted in Other Vintage Computers & Consoles)
2 Feb 8, 2012 3:16 pm
Re: sid player on Amstrad CPC 128k (7 replies, posted in Other Vintage Computers & Consoles)
Hi all
I created the player used 6510 emulation code of Simon Owen, and CPC header checking. The player spends a lot of time with 6510 code, this is the reason of speed changing on CPC, on Enterprise I met less speed changing, may be the cause of this on EP the processor is running at 4Mhz if the code is not in the video Memory.
Yes, only some feature is emulated, frequency registers, envelopes in 50Hz, control registers (without wave formats), and volume register, if I remember well.
And the noise emulation is also interesting on CPC, because when noise should apply then I give fix 0f value to noise channel, and drive the frequency with tone channel frequency (set reg 6 tone and noise enable on a channel), with this solution 3 different noises can appear on the AY.
That's all what I remember now, if you have questions, do not hesitate.