We just released a Feb. 5 '89 prototype of DuckTales for the NES!
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If you'd like to support our preservation efforts (and this wasn't cheap), please consider donating or supporting us on Patreon. Thank you!
Talk:Tecmo Bowl (NES)
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Entry point to that "BSOD" screen is in IRQ handler, which is never used as an IRQ handler in MMC1. So, if any IRQ accidentally occurs, this screen happens. Also, NMI interrupt handler always watching at the top ot the stack for interrupt return address and checks if there is higher bit is set (e.g. 8000-ffff address space is used). If not, then it means program has as unexpected error and running from the 0000-7fff area and error screen occurs too... the same BSOD is in Tecmo Super Bowl, entry point 1A bank at 0x8000, address 0x9A00._-!--0.png)
--Cah4e3 12:31, 3 March 2011 (EST)
