Here are the recommended settings:
Switch number: 1 2 3 4 5 6 7 8
. --- --- --- --- --- --- --- ---
Switch position: Off Off Off Off On Off On On
Below is a detailed explanation of each switch setting.
Switch 1 2 3
. IRQ4 IRQ3 IRQ2
Selects Interrupt Request (IRQ) priority level.
Only one of these switches can be set to the On position. The other two must be Off. Switch 1 is IRQ4, the same as serial port COM1. Switch 2 is IRQ3, the same as port COM2. Switch 3 is IRQ2, determines the priority level at which the card will interrupt the IBM computer whenever it changes state. Level 2 has the highest priority and level 4 the lowest. Do not use switch 3 if you have an IBM PC-AT computer.
Switch 4 6
. DRQ3 DAK3
DMA Request and DMA Acknowledge on DMA channel 3.
Both of these switches must be on (and switches 5 and 7 must be off) for the card to communicate with the IBM computer via channel 3.
Switch 5 7
. DRQ1 DACK1
DMA Request and DMA Acknowledge on DMA channel 1.
Both of these switches must be on (and both switches 4 and 6 must be off) for the card to communicate with the IBM computer via DMA channel 1.
Switch 8
. $24x/$22x
Selects the address range of the card.
If this switch is on, the card will respond to control signals sent to addresses in the range $240 to $247. If this switch is off, the card will respond to control signals in the range $220 to $227. The IBM addressing scheme allows each card to respond to 32 addresses, but the LocalTalk PC Card uses only 8 of them.
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