Tektronix 8001A Installation Manual page 51

System Communications Module
7-4
The memory map consists of a 512 X 1 bit RAM which contains a bit map defining the
user's memory address space.
Bit Map Options
The bit map defines 512 blocks of 128 bytes each in the 64k addressable space. Blocks
are defined as follows: Block 0 - bytes 0 to 127, Block 1 - bytes 128 to 255, etc. The
64k address space can also be divided into 256 blocks of 256 bytes each. Block 0 - bytes
0 to 255, etc.
128 byte/block operation is selected when both RAMs (825116) are installed and J2 is in
position "B".
256 byte/block operation is selected when J2 is in position "A" and U2020 is removed.
See Fig. 7-1 for jumper locations.
REV A, OCT 1978
8001/8002 Installation Guide