SMS Core Fails Frame IRQ HCount Test

[ajgowans]

The SMS core fails the "Frame IRQ HCount" test in the attached VDPTEST rom. You can compare to the same test run on a PAL SMS2, also attached.

I have attached the full test results for the SG (on latest JB FW, but being run off of a flashcard) and PAL SMS2, and also the current MiSTer core which may be of interest . VDPTEST.sms.zip SMS Test Mega SG (15-Oct-2021).zip SMS Test PAL MS2 (15-Oct-2021).zip SMS Test MiSTer (29-Sep-2021).zip