This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
Press <Esc> at power-up will disable Transwarp completely until the next power off/on cycle. A better way is to write a 01 to $C074. This will slow Transwarp down to 1 MHz without disabling it completely. Writing a 00 to $C074 will restore Transwarp to it's 'fast' speed. By: Rubywand
 
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