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20.013 What are the settings for the Apple Super Serial Card?
Description
This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
20.013 What are the settings for the Apple Super Serial Card?
Here is some information about Super Serial Card (SSC) Settings:
Recomended Slots
Slot 1 for printer use
Slot 2 for modem (and most non-printer serial communications) use
Jumper Block- configures serial I/O lines. This does not set the operating mode
of the card. Operating mode is set via the DIP switches.
For typical printer use, label is right side up (arrow points DOWN), DIPs
are set for printer operation, and a printer cable is used. This jumper setting
can also be used with a modem cable to make a NULL modem connection to another
computer. (DIPs would then be set for modem operation.)
For typical modem use, the label is upside down (arrow points UP), DIPs are
set for modem mode, and a modem cable goes to the modem. To make a NULL modem
connection to another computer, use a modem cable + NULL modem adaptor.
Note that RS-232-C signals on the SSC use negative-true logic; that is, they
are true at 0v and false at +5 volts.
DIP Switch Settings
These set the default operation of the SSC. The settings may be overridden
via commands entered from the keyboard or from software.
SW1 Dip Switch Settings
SW1 Dip Switch 1-4 Settings
Baud SW1-1 SW1-2 SW1-3 SW1-4 SW1-8
50 on on on off not used
75 on on off on "
110 on on off off "
135 on off on on "
150 on off on off "
300 on off off on "
600 on off off off "
1200 off on on on "
1800 off on on off "
2400 off on off on "
3600 off on off off "
4800 off off on on "
7200 off off on off "
9600 off off off on "
19200 off off off off "
SW1 Dip Switch 5-7 Settings
SW1-5 SW1-6 SW1-7
Modem operation on on on
Printer operation off on on*
Note
Switch SW1-5 and SW1-6 help define the operation mode of the card.
1-5 1-6 Operation Mode
on on Modem
off on Printer
on off Emulate Apple Serial Interface Card with P8 PROM
off off Emulate Apple Serial Interface Card with P8A PROM
Switches SW1-7 and SW2-7 select between the standard and secondary Clear To
Send signals when the jumper block is set for printer operation.
1-7 2-7 pin
on off CTS
off on SCTS
For modem operation,
SW1-7 should always be ON and
SW2-7 should always be OFF.
*For printer operation, the setting may vary.
If using an Imagewriter II
SW1-7 should be ON and
SW2-7 should be OFF.
SW2 Dip Switch Settings
Switches SW2-1 through SW2-4 functions depend upon whether modem or printer
operation is enabled.
SW2 Dip Switch 1-4 Settings for Modem operation
Data Parity Stop SW2-1 SW2-2 SW2-3 SW2-4
Bits Bits
7 none 1 on off off on
7 odd 1 on off on off
7 even 1 on off off off
7 none 2 off off off on
7 odd 2 off off on off
7 even 2 off off off off
8 none 1 on on off on
8 odd 1 on on on off
8 even 1 on on off off
8 none 2 off on off on
8 odd 2 off on on off
8 even 2 off on off off
SW2 Dip Switch 1-4 Settings for Printer operation
SW2-1 Default data format
on 8 data, 1 stop
off 8 data, 2 stop
SW2-2 Delay after sending out a RETURN character
off None
on 32 milliseconds
SW2-3 and SW2-4 set line width and video output
2-3 2-4 Function
on on 40 column output, video on
on off 72 column output, video off
off on 80 column output, video off
off off 132 column output, video off
SW2 Dip Switch 5-7 Settings (Modem or Printer operation)
SW2-5 enables automatic line feed generation.
on auto-send a linefeed after sending a CR
off no linefeed auto-send
SW2-6 enables interrupts.
on Yes (recommended for baud rates of 1200 or greater)
off No
SW2-7 used with SW1-7 to select CTS signal
on may have this setting for use with some printers
off correct setting for modem operation
(SW2-8 is not used)
Connector Pin Assignments
10-Pin Dsub-25
Header Connector Signal Name
__________________________
1 1 Frame Ground
2 2 Transmit Data (TXD)
3 3 Receive Data (RXD)
4 4 Request To Send (RTS)
5 5 Clear To Send (CTS)
6 6 Data Set Ready (DSR)
7 19 Secondary Clear To Send (SCTS)
8 7 Signal Ground
9 20 Data Terminal Ready (DTR)
10 8 Data Carrier Detect (DCD)
Pins 1-7 and 2-7 are set together to determine the SSC pin to be read for the
Hardware Handshaking signal. Generally set to monitor Pin #20.
Typical Configurations (and Don't Forget The JUMPER Block)
Modem** ImageWriter I/II Printer***
SW1 SW2 SW1 SW2
1234567 1234567 1234567 1234567
ON XXXX XX XXX X XX X XX
OFF XXX X X XXX X XX XX
** Default is 9600 baud, 8 data bits, no parity, 1 stop bit. The correct
settings for SW2-5 (on= auto-send linefeed after CR) and SW2-6 (on= enable
interrupts) may vary.
*** This is the setting recommended in the IW-II manual.
By: Kevin M. Carr
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