[Coco] Emulators, FPGA Becker port questions

[Bill Pierce]

Brett, I'm not sure about the VSYNC, but I do know that in VCC, when overclocked (but throttled), that running Ultimuse3, the MIDI timer stays in time no matter how fast I overclock. Song play the right speed. Ultimuse3 uses the OS9 clock for it's MIDI timing.
I have another MIDI player (Lyra play) that uses a software timer and it speeds up with the overclocking. It doesn't use the clock but uses "loops" for timing.
As a note, in OS9, the keyboard input does not speed up with overclocking, but the key repeat and delay does speed up.
 

Bill Pierce
"Today is a good day... I woke up" - Ritchie Havens
 

My Music from the Tandy/Radio Shack Color Computer 2 & 3
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-----Original Message-----
From: Brett Gordon <beretta42 at gmail.com>
To: CoCoList for Color Computer Enthusiasts <Coco at maltedmedia.com>
Sent: Mon, Jan 5, 2015 2:27 pm
Subject: [Coco] Emulators, FPGA Becker port questions


I added a timeout to my becker/dw port routines.  I hear some people's
servers can't respond fast enough to avoid a simple timeout when using
super-fast 6809 implementations.  Looks like I need an implementation
independent timer.  I thought of using the VSYNC interrupt to help me.
Does anyone know if Vcc and/or FPGA speed up the VSYNC as well as the
regular clock ?  I'm hoping not :)

-- 
Brett M. Gordon,
beretta42 at gmail.com

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