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HP 82335 and 27209
-----------------------------------------------------------------------------------
Configuring the cards:
-----------------------------------------------------------------------------------
The 27209 and the 82335 cards are "memory mapped",
and are different from most I/O cards, which use an port address space.
The legal mappings are into 16 KB blocks of the "reserved" 384 KB of DOS RAM and
are as follows:
+---------------+
| select code 8 | E0000 <-- not recommended
+---------------+
default switch setting --> | select code 7 | DC000
+---------------+
| select code 6 | D8000
+---------------+
| select code 5 | D4000
+---------------+
| select code 4 | D0000
+---------------+
| select code 3 | CC000
+---------------+
| select code 2 | C8000
+---------------+
The HP 27209 card is also known under the product numbers 82990, 61062, and
88500; it's the same card no matter what the number. The card has the layout:
+-----------------------------------------+
| 27209 |
| +----
| |
| |
| |
| +--+
| | |
| | |
| | |
| 1 +--------+ | |
| | | Configuration Switches +--+
| 0 +--------+ (8) |
| 87654321 |
| |
+---+ +-------+
| | |
+-----------------------------+ |
|
The switches have the default settings:
27209 Default Switch Settings
+---------------------------------+
0 | +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ |
| |X| | | | | | | |X| | | |X| |X| |
| +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ |
| | | |X| |X| |X| | | |X| | | | | |
1 | +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ |
+---------------------------------+
1 2 3 4 5 6 7 8
Note that the diagram is upside-down relative to the DIP switch orientation in
the board-layout diagram; this can be confusing, so I recommend that you hold
the card upside-down while setting the switches so the orientation matches this
illustration.
=> Switches 1 to 4 control the card's memory address as follows:
___________________________
switch select address
1234 code
___________________________
0000 16 C0000
0001 1 C4000
0010 2 C8000
0011 3 CC000
0100 4 D0000
0101 5 D4000
0110 6 D8000
0111 7 DC000
1000 8 E0000
1001 9 E4000
1010 10 E8000
1011 11 EC000
1100 12 F0000
1101 13 F4000
1110 14 F8000
1111 15 FC000
___________________________
The default address is DC000, or select code 7.
Switch 5 was defined to allow certain antique HP Vectra PCs to boot DOS off an
external HPIB disk drive (when the appropriate software was installed). This
switch should always be set to 0, since you may hang your PC if it is set to 1.
Switch 6 does nothing useful, but it should be left set to 1.
Switches 7 and 8 control the PC IRQ level of the card:
________________
PC IRQ 7 8
________________
3 0 0
4 0 1
5 1 0
6 1 1
________________
The default IRQ level is 3.
* The HP 82335 has the same form-factor, but a different layout. (The two cards
are easy to distinguish in practice. All the chips on the 27209 are laid out
horizontally, parallel to the PC-bus edge connector; all the chips on the 82335
are laid out vertically, at a right angle to the PC-bus edge connector.)
+-----------------------------------------+
| 82335 |
| +----
| 1 0 |
| 1 +----+ |
| 2 | | |
| 3 | | Configuration +--+
| 4 | | Switches | |
| 5 | | (8) | |
| 6 | | | |
| 7 | | | |
| 8 +----+ +--+
| |
| |
| |
+---+ +-------+
| | |
+-----------------------------+ |
|
The default settings of the switch are as follows:
+-----------------+
1 | +----+----+ | 0
| 1 | |XXXX| 0 |
| +----+----+ |
| 2 |XXXX| | 1 |
| +----+----+ |
| 3 |XXXX| | 1 |
| +----+----+ |
| 4 |XXXX| | 1 |
| +----+----+ |
| 5 | |XXXX| 0 |
| +----+----+ |
| 6 | |XXXX| 0 |
| +----+----+ |
| 7 | |XXXX| 0 |
| +----+----+ |
| 8 | |XXXX| 0 |
| +----+----+ |
+-----------------+
The switch numbering is on the left; the actual values of the default settings
are on the right. Note that if the DIP uses slide switches, a "0" corresponds
to the slide pushed to the right; if the DIP uses rocker switches, a "0"
corresponds to the switch depressed on the right.
Switches 1-4 control the card's PC bus address and interface select code (ISC);
they operate the same as they do with the 27209:
___________________________
switch select address
1234 code
___________________________
0000 16 C0000
0001 1 C4000
0010 2 C8000
0011 3 CC000
0100 4 D0000
0101 5 D4000
0110 6 D8000
0111 7 DC000
1000 8 E0000
1001 9 E4000
1010 10 E8000
1011 11 EC000
1100 12 F0000
1101 13 F4000
1110 14 F8000
1111 15 FC000
___________________________
The default setting is ISC 7. Switches 5 & 6 control the PC interrupt level;
they operate as do switches 7 and 8 on the 27209 card:
________________
PC IRQ 5 6
________________
3 0 0
4 0 1
5 1 0
7 1 1
________________
The default setting is IRQ 3. Switches 7 and 8 are not used.
|
