In SX Microcontrollers, SX/B Compiler and SX-Key Tool, cbmeeks wrote:

maybe you should clear the SRAM when you init/boot the SX?  Should only take a few µS to clear 32k.

why are you having the main code and video interrrupt access the SRAM at the same time?  Or is that something you are trying to fix.  I would try to build the scanline (reading from SRAM) during the HBlank and only allow the main code to access the SRAM during VBlank

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