HP 70301A, Installation And Verification Manual, Page: 34 / 60

Address Matrix
The address matrix, as Figure 2-4 sho ws, is a graphic represen tation of addresses on the
HP-MSIB. The 8-row b y 32-column matrix implies 256 a v ailable addresses; ho w ev er, there are
actually 255 legal addresses plus an illegal address at row 0, column 31.
Figure 2-4. The Address Matrix
Eac h elemen t m ust ha v e a unique 8-bit binary HP-MSIB address correctly placed on the
address matrix. The three most signicant bits (MSB) determine the row address; the v e
least signicant bits (LSB), the column address. This man ual refers to the decimal equiv alen t
of a binary address (see T able 2-2 ).
T able 2-2. Decimal Equiv alent of Binary Address
Row
MSB
Column
LSB
Binary 010 11000
Decimal 2 24
Figure 2-5. Master/Sla v e Addressing with Sla v e Area Defined
2-8 Installation