Delta Tau GEO BRICK LV Reference Manual
Turbo PMAC/PMAC2 Software Reference
Turbo PMAC Global I-Variables
52
Default:
0
I27 controls how the Turbo PMAC interprets incoming data on a TWS-format M-variable read from an
ACC-34 or similar serial-interface I/O board. If I27 is set to the default value of 0, PMAC expects the
serial input data on the DAT0 signal line. If I27 is set to 1, PMAC expects the serial input data on the
DAT7 signal line.
ACC-34 or similar serial-interface I/O board. If I27 is set to the default value of 0, PMAC expects the
serial input data on the DAT0 signal line. If I27 is set to 1, PMAC expects the serial input data on the
DAT7 signal line.
The DAT7 line is separated more from the output clock line on the same cable; the use of DAT7 by
setting I27 to 1 and making the appropriate jumper setting on the I/O board makes it possible to use a
longer cable without too much coupling interference between signals.
setting I27 to 1 and making the appropriate jumper setting on the I/O board makes it possible to use a
longer cable without too much coupling interference between signals.
On the ACC-34AA, jumper E23 must be connect pins 1 and 2 to support the default setting of I27 = 0; it
must connect pins 2 and 3 to support the setting of I27 = 1. On the ACC-76 and ACC-77 “P-Brain”
boards, jumper E1 should be ON to support the default setting of I27 = 0; jumper E8 should be ON to
support the setting of I27 = 1. Older boards of this class do not support settings of I27 = 1.
must connect pins 2 and 3 to support the setting of I27 = 1. On the ACC-76 and ACC-77 “P-Brain”
boards, jumper E1 should be ON to support the default setting of I27 = 0; jumper E8 should be ON to
support the setting of I27 = 1. Older boards of this class do not support settings of I27 = 1.
I28
Display Port Disable
Range:
0 – 1
Units:
none
Default:
0
I28 permits the user to disable the automatic update of 80-character displays on the the JDISP port. If I28
is set to the default value of 0, the Turbo PMAC will write an ASCII character value to the 8 data lines
(DISP0 – DISP7) of the JDISP port every real-time interrupt, and index a pointer to the next character in
Turbo PMAC’s 80-character buffer in RAM.
is set to the default value of 0, the Turbo PMAC will write an ASCII character value to the 8 data lines
(DISP0 – DISP7) of the JDISP port every real-time interrupt, and index a pointer to the next character in
Turbo PMAC’s 80-character buffer in RAM.
If I28 is set to 1, this automatic functionality is disabled, permitting general-purpose use of the 8 I/O lines
on the port. On many hardware versions of the Turbo PMAC, the buffer IC for this port can only support
outputs, but on some it is possible to reverse the direction of these lines to input as well.
on the port. On many hardware versions of the Turbo PMAC, the buffer IC for this port can only support
outputs, but on some it is possible to reverse the direction of these lines to input as well.
I28 is only used at power-on/reset, so to make a change in the functionality of the display port, it is
necessary to change the value of I28, store the value in non-volatile flash memory with the SAVE
command, and reset the Turbo PMAC.
necessary to change the value of I28, store the value in non-volatile flash memory with the SAVE
command, and reset the Turbo PMAC.
I29
Multiplexer Port Alternate Address
Range:
$0, $078400 - $07B7FF
Units:
Turbo PMAC addresses
Default:
0
I29 permits the user to select an alternate address for the automatic functions of the “JTHW” multiplexer
port, such as TWS, TWR, and TWD-format M-variables. If I29 is set to the default value of 0, the Turbo
PMAC will use the standard multiplexer-port register at address Y:$078402 for these functions.
port, such as TWS, TWR, and TWD-format M-variables. If I29 is set to the default value of 0, the Turbo
PMAC will use the standard multiplexer-port register at address Y:$078402 for these functions.
If I29 is set to a non-zero value, Turbo PMAC will use the Y-register at the address specified by the value
for these functions. There are several possible uses for this functionality.
for these functions. There are several possible uses for this functionality.
In the Turbo PMAC2-Eth Ultralite and Turbo PMAC2-RTEX controllers, the multiplexer port uses the Y-
register at $078400, so I29 should be set to this value to use the automatic functions on this port.
register at $078400, so I29 should be set to this value to use the automatic functions on this port.
If an ACC-2P is installed on a Turbo PMAC2A-Eth Lite (“Clipper”) board, and it is desired to use the
automatic functions on the multiplexer port of the ACC-2P instead of that of the Clipper itself, I29 should
be set to $078502.
automatic functions on the multiplexer port of the ACC-2P instead of that of the Clipper itself, I29 should
be set to $078502.
If multiple ACC-5E boards are installed in a UMAC Turbo system, and it is desired to use the automatic
functions on the multiplexer port of one of the secondary boards not at the standard base address, I29
functions on the multiplexer port of one of the secondary boards not at the standard base address, I29