Subject: [stella] more keyboard nonsense From: "John K. Harvey" <jkharvey@xxxxxxxxxxxxxxxxx> Date: Mon, 06 Nov 2000 11:18:52 -0600 |
Hi, all. Here's my next big question that's been bugging me recently: For the keyboard controllers, according to the Stella Programmer's guide, it says you need to wait 400 microseconds after sending to SWCHA to read the INPT ports. Has anyone written a small program to verify this? How many cycles is it in reality? Doesn't it compute to: 1 sec / 1000000 microseconds times 400 microseconds = 0.0004 seconds 1194720 cycles per second times 0.0004 seconds = 477.888 cycles = 6.288 scanlines? Is it true? Why the long wait? Thanks. -John K. Harvey -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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