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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.
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