I recently purchased a $13 Z80 computer from Edmond Scientific (from the inventor's room). Here is an excerpt from the manual (translated from Chinese):
EVERY PROGRAM STARTS OFF WITH BUGS.
Many programs end up with bugs as well. There are two corollaries to this: first, you must test all your programs straight away; & second, there's no point in losing your temper every time they don't work. The general plan can be illustrated with this algorithm: (translated from flowchart)
-- Start -- Write program with as few bugs as possible loop -- test the program if( program works perfectly ) done; else -- keep your hair on -- Find the bugs -- Fix them, introducing as few new ones as possible. endif endloop
The machine makes truly horrible sounds whenever a key is pressed. Here is the manual section about keyclick:
"So many sound!" you may think. "May I play my computer more quietly?" The answer is sure. You can simply type
then ENTER. Now the computer is in No BEEP mode, and no any sound will be responded when you press the keys. Later, if you like to have beep sound again, you type
then ENTER. Now the computer already in BEEP mode and the keys will respond it's lively sound if you activated any key.
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