Subject: [stella] Supercharger tape specs... From: Robin Harbron <robinh@xxxxxxxxxxxxxxx> Date: Wed, 03 Sep 1997 01:11:48 -0400 |
I did a rewrite of my playbin routine for the C64... it still doesn't work :) But here's a few questions for you: According to Chris Salomon's notes on the Supercharger Low level tape format: The optimal widths that maximize signal strength through the filter are: 0 bit: 227 microseconds (range from 158-317) 1 bit: 340 microseconds (range from 900-2450) Is the 227 microseconds correct? That works out to about 4405 Hz, right? The C64 can only handle up to about 4000 Hz... seems funny to me - can a regular tape deck handle that well? Anyway, assuming it's right, I can't use these optimal frequencies. Another point of clarification, is this pulse width of 227 microseconds the whole cycle? From 0 to + to 0 to - and back to +, if you get what I mean... basically, does "pulse widths" = "cycle length"? When the C64 generates a pulse waveform, you choose how much of the cycle is spent at the "top" of the waveform... I've currently got that at 50%, I guess this works best... I've arbitrarily chosen new widths of: 0 bit : 286 ms = 3500 Hz 1 bit : 428 ms = 2337 Hz Should these be fine? Robin. -- Archives updated once/day at http://www.biglist.com/lists/stella/archives/ Unsubscribing and other info at http://www.biglist.com/lists/stella/stella.html
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