May 2024
Intermediate to advanced
665 pages
23h 2m
English
book
The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
by Lyla B. Das
Content preview from The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
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270 THE x86 MICROPROCESSORS
8.8 | Addressing Video Memory Directly
Now, let us try to address video RAM which is just like any other RAM. We know that the
starting address of video memory for CGA display is B800:0000. We will attempt to display
our data without using BIOS, rather, we write data directly into video RAM which causes dis-
playing of that information. Let us try to make the whole of page 0 display appear green. For
this a 16-bit number with the attribute byte and ASCII character is loaded in AX. is word
is written into the 2000 locations (25 × 80 characters) starting from the address B800H. Using
string instructions, this display ...
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