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Old 12 November 2012, 03:23   #20
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Join Date: Jul 2012
Location: Kassel
Posts: 52
Originally Posted by Toni Wilen View Post
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)
i have no original dd2 i tryed to write the ipf back but i cant as its a custom disk format.

sadly i dont have a cyroflux to write it back to disk.
is there any other way to test that ?

to test the ar2 boot screen i need dumps of the original roms as i only have the ar3.
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