EMMA 02

VIP2K Membership Card

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Memory

Memory Map

0000 - 7FFF 32 KB ROM with VIP2K Monitor Program
8000 - E7BF User RAM and STACK memory
E7C0 - E7FF Monitor Program’s protected memory for its variables
E800 - FFF7 Video Memory
E800 - E8CF First 8 border scan lines, should always be 0
E8D0 - FC4F Data for scan lines 1 to 192, 26 bytes per line.
First and last byte define 3 bits of the screen border and are 0 in normal operation
FFF0 Holds the current Line number (0 thru 23)
FFF1 Holds the current Column number (0 thru 23)
FFF8 - FFFF Monitor Program’s protected memory for its variables
FFF8 Holds the Scroll On/Off variable 00 = scroll on, any nonzero = scroll off
FFF9 Temporary storage for the keyboard input code
FFFB Storage for the HI order Interrupt counter
FFFC Storage for the LO order Interrupt counter