SEALEVEL SYSTEMS, INC.

ACB-II/EX

Card Type Serial card
Chip Set Zilog
Maximum Onboard Memory Unidentified
I/O Options Serial port
Data Bus 16-bit ISA


CONNECTIONS

Function

Label

Serial port via DB-37 connector

P1


USER CONFIGURABLE SETTINGS

Function

Label

Position

RS-485 transmit driver enabled by RTS E2 Pins 1 & 2 closed
RS-485 transmit driver always enabled E2 Pins 1 & 2 open
RS-485 Echo enabled E2 Pins 3 & 4 open
RS-485 Echo disabled E2 Pins 3 & 4 closed
Transmit clock is an input E7 Closed
Transmit clock is an output E7 Open
Serial port enabled SW1/8 On
Serial port disabled SW1/8 Off


DMA ENABLE BIT SELECTION

Setting

 E1/Pins 1 & 2 E1/Pins 3 & 4 E1/Pins 5 & 6
No DMA Open Open Open
DMA enabled by Base+4 Position D7 Closed Open Open
DMA enabled by RTSB Open Closed Open
DMA always enabled Open Open Closed


SINGLE CHANNEL, HALF DUPLEX DMA SELECTION

Setting

 E3 E4

No DMA (channel A)

 Open Open

Channel 0

 Pins 1 & 2, 3 & 4 closed Open
Channel 1 Pins 5 & 6, 7 & 8 closed Open
Channel 2 Pins 9 & 10, 11 & 12 closed Open
Channel 3 Pins 13 & 14, 15 & 16 closed Open

Note: Channel 2 can be used only if floppy disk DMA drivers are disabled.
Note: Each DMA channel is selected by 2 jumpers per header. Pins are open unless designated as closed.


FULL DUPLEX DMA CHANNEL SELECTION

Setting

 E3 E4

No DMA (channel A)

 Open Open
Channel 0 (receive data) Pins 1 & 2, 3 & 4 closed Pins 9 & 10, 11 & 12 closed
Channel 1 (receive data) Pins 5 & 6, 7 & 8 closed Pins 13 & 14, 15 & 16 closed
Channel 2 (transmit data) Pins 1 & 2, 3 & 4 closed Pins 9 & 10, 11 & 12 closed
Channel 3 (transmit data) Pins 5 & 6, 7 & 8 closed Pins 13 & 14, 15 & 16 closed

Note: Channel 2 can be used only if floppy disk DMA drivers are disabled.
Note: Each DMA channel is selected by 2 jumpers per header. Pins are open unless designated as closed.


IRQ MODE SELECTION

Setting

 E5/Pins 1 & 2 E5/Pins 3 & 4 E5/Pins 5 & 6
DMA terminal count interrupt enabled Closed Open Open
Single interrupt mode normal Open Closed Open
Add 1K ohm pull-down resistor on port Open Open Closed

Note: When sharing interrupts with another card, use the add 1K ohm pull-down resistor setting. Only 1 card should have this setting.


IRQ SELECTION

IRQ

 E6
Auto Open

3

 Pins 1 & 2 closed

4

 Pins 3 & 4 closed

5

 Pins 5 & 6 closed

7

 Pins 7 & 8 closed

9

 Pins 9 & 10 closed
10 Pins 11 & 12 closed
11 Pins 13 & 14 closed
12 Pins 15 & 16 closed
15 Pins 17 & 18 closed

Note: Pins are open unless designated as closed.


PORT TYPE SELECTION

Type

 E8 E9

RS-232

 Open Closed
  RS-530/422/485 Closed Open

Note: 24-pin DIP-shunts are used for this selection.


BASE I/O ADDRESS SELECTION

Setting

SW1/1

SW1/2

SW1/3

SW1/4

SW1/5

SW1/6

SW1/7

238h

 Off On On On Off Off Off
280h Off On Off On On On On
2A0h Off On Off On Off On On
2E8h Off On Off Off Off On Off
300h Off Off On On On On On
328h Off Off On On Off On Off
3E8h Off Off Off Off Off On Off

Note: Off=1, On=0