The maximum size the RAM disk can be extended to
is
shown on the right
of
the fifth line. The above display shows the maximum possible
(24
kb) which
occurs when no RAM
is
reserved for USER BIOS.
If
a USER BIOS area has been reserved, the value
of
the maximum value will
reflect this. The total USER BIOS and RAM disk must not exceed 24 kb.
If
an Intelligent RAM disk
is
connected it
is
not
possible
to
use
part
of
the
memory
of
the PX-S
to
extend the size
of
this RAM disk.
For
example,
if
the
RAM Disk Unit
120
is
connected, when option 7
is
chosen from the CONFIG
main menu, the screen changes to show:
***
RAM
DISK ***
An
external
RAM
disk
is
connected.
ESC
to
return.
RAM
di
sk
size
:
120
kb
The ESC key can then be used
to
return
to
the
CONFIG main menu. Further
details
of
the Intelligent RAM disk can be found in Chapter 4.
WARNING:
Do
not switch
off
the PX-8 (either manually or
by
allowing the auto power
off
to be activated) after changing the
RAM
disk size without exiting from
the CONFIG program.
Thefull
configuration can only be carried out
by
CP/M.
If
the
PX-8
is
switched
off,
the
RAM
disk could be destroyed
and it may also be necessary to re-initialise the system.
8. CHANGING THE RS-232C INTERFACE PARAMETERS
Option S on the CONFIG main menu allows the settings
of
the RS-232C inter-
face to be set.
The RS-232C interface
is
used
to
transmit
data
to
and from the PX-S. For ex-
ample
if
a text file has been written
on
the PX-S and the
data
needs to be used
on
a desk
top
computer such as the EPSON QX-lO, the file can be sent to the
other computer using the TERM
or
FILINK program in the
CP/M
UTILITY
ROM. This transmission can be by cable directly to the other computer, or over
a telephone line using
an
acoustic coupler.
The RS-232C interface or the serial interface can be used to connect
to
a printer.
3-68
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h·
_ T e prmter must ave a
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to
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_
~
This allows program listings as well as letters/reports or other text
data
from
_
I""
applications programs
to
be printed for a permanent record.
~r~
~I~
iJ,r~
~r~
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,~
-I
e 1
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e
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c I
.~
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1
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CL~
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;L~
..
L~
eL~
eL,~
CL~
.~
~
~
In both these cases the parameters
of
the interface have to be matched. This
option
on
the menu allows the parameters
to
be set. In general they should be
set
or
checked with this option before using the communicatiop.s program (e.g.
TERM or FILINK). Further details
of
the RS-232C interface are given in Chap-
ter
4.
When option S
is
chosen from the CONFIG main menu the screen changes to
display:
***
RS-232C
***
Select
alphanumeric
or
ESC
to
return.
bit
rate
:
4800
data
bits:
8
parity
:
none
stop
bits:
2
1=19200
7=300
C=7
E=none
H=1
2=9600
8=150
0=8
F=odd
1=2
3=4800
9=110
G=even
4=2400
A=75/1200
5=1200
B=1200/75
6=600
<Tx/Rx)
The bit rate (bits per second
or
baud rate) currently set
is
shown
on
the fourth
line.
It
can be changed
to
various settings using keys 1
to
9 and keys A and
B. The settings produced by keys 1
to
9 set transmission rates in both direc-
tions (transmit and receive). The A and B keys set a rate which is different for
transmitting and receiving. The A key sets
75
baud transmit (Tx) and
1200
receive
(Rx) with the reverse for key B.
The number
of
data
bits
is
shown on the sixth line and can be changed using
the C and D keys.
The parity
is
shown on the seventh line and can be changed using the E, F and
G keys.
The number
of
stop bits
is
shown
on
the eighth line
and
can be changed using
the H and I keys.
When the parameters have been set or checked, the ESC key returns the PX-S
to the main menu.
9. Screen Mode
This option can be used to change the screen configuration. Details
of
the types
3-69
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