#WE

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... er down cycles. Clearly, this signal would not be necessary for the proper operation of the FM1808. So how to address the #OE signal issue on FM1808? #WE Controlled Timing Looking at the Saturn’s BRAM schematic more carefully, you’ll notice that it operates with only 2 control signals: SRAMCE and MWR. Inspecting the UPD43257B datasheet reveals device operation as follows: Read – #CE1 = ‘0’ and #WE = ‘1’ Write – #CE1 = ‘0’ and #WE = ‘0’ Therefore, the Saturn doesn’t use an #OE signal for the BRAM. It simply strobes SRAMCE to read the BRAM contents. Luckily, the FM1808 can operate in a similar mode – #WE controlling timing. Below is an excerpt fro ...

... need to start at the top of what we call the "Program Segment Prefix", an area in memory where things like the last DOS command line executed reside. #WErd Proc The name of our main procedure will be "Werd". :) #start: Just a label, which will eventually tell the program where it is supposed to start executing. #mov ah,09 This puts the value of "09" into AH. When we call interrupt 21 later, it will look to AH for an instruction of what it's supposed to do. "09" means it's supposed to print a string. #lea dx,TextString This code loads the memory address of our variable "TextString" into the DX register. Int 21 will look here for the addre ...