Filter
Top Products
PROGRAMM
ABLE OPTION SELECT
The remaining POS registers are used for address and
interrupt selections. These registers are programmed by
the user through the IBM installation utility supplied
with the PS/2. These registers are read/write but should
not be written to by user software. The bit definitions
of these registers are given in figures 16(a) and 16(b).
+-------+
D7 | CHEN1 |----- Channel enable
+-------+
D6 | INS11 |--+
+-------+ +-- Interrupt select
D5 | INS10 |--+
+-------+
D4 | ADS13 |--+
(a) +-------+ |
D3 | ADS12 | |
+-------+ +-- Address select
D2 | ADS11 | |
+-------+ |
D1 | ADS10 |--+
+-------+
D0 | CEN |--- Card enable
+-------+
+-------+
D7 | CHEN2 |----- Channel enable
+-------+
D6 | INS21 |--+
+-------+ +-- Interrupt select
D5 | INS20 |--+
+-------+
D4 | ADS23 |--+
(b) +-------+ |
D3 | ADS22 | |
+-------+ +-- Address select
D2 | ADS21 | |
+-------+ |
D1 | ADS20 |--+
+-------+
D0 | 0 |----- Reserved
+-------+
Figure 16. DS-2000 POS implementation.
(a) POS location 102H
(b) POS location 103H
iii