Epson PX-8 User Manual page 74

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
*'
h · ' h ·1· f · d . h·
_ T e prmter must ave a sena mter ace m or er to receIve t e mformation.
_ ~ 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~
..
,~
-I
e
1
.~
e
I"
e
~
c
I
.~
e;
1
.~
e; I.~
,[---
C
t ___
CL~
~L'4
.,t~
;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