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Old 10 November 2012, 19:38   #16
Toni Wilen
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 43
Posts: 21,512
Some notes and guesses:

AR 3 seems to detect between CPU reset (reset-instruction, short pulse) and keyboard reset (long pulse). I managed to duplicate AR3 real hardware behavior (power on = no title screen) if only keyboard reset triggers internal AR init condition.

AR 2 does not seem to have this kind of reset detection.

My guess is that AR2 hangs or crashes if CPU reset instruction is executed. AR3 has extra protection (with side-effect of not showing title screen at power up)

Following tests needed:

- Does AR3 work with Double Dragon II (original, OCS-only 3.84 version). It has protection code that uses RESET instruction. (Code runs before title screen)

- Does AR2 show boot screen at power up? or only after keyboard reset? (like AR3 does)
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