Re:Clocking a 6502 simulator to 15GHz
by numpad0 on Monday April 13, 2020 @11:47PM
(#22862579)
I had an impression that they might be talking what a digital I/O pin looks on oscilloscope.
Scopes lock at first rising edge after last horizontal scan, so display starts at H, then drops to L after how long CPU held that pin high. That creates ￣￣l＿ lines on the screen superimposed to one another, X position “wiggling” ￣lll＿ depending on how many consecutive H bits just happened to be sent.
When the CPU halts, the pin would flatline at H or L and you’ll know.
Scopes lock at first rising edge after last horizontal scan, so display starts at H, then drops to L after how long CPU held that pin high. That creates ￣￣l＿ lines on the screen superimposed to one another, X position “wiggling” ￣lll＿ depending on how many consecutive H bits just happened to be sent.
When the CPU halts, the pin would flatline at H or L and you’ll know.