Epson PX-8 User Manual page 96

7) Finally return the silver coloured flap to its original position and replace
the outer plastic cover.
8) Turn the power back on.
9)
If
you are on the MENU page, press the
1
ESC
1
key to go to the CP
1M
com-
mand line. From the CP
1M
command line carry out a warm boot by press-
ing
1
CTRL
1-
[g or the
1
STOP
1
key.
10) The programs can be loaded from drive B: if the ROM has been placed
in ROM socket 1, and from drive C: if placed into ROM socket 2. The
assignment of the sockets to different drives, can be changed using the CON-
FIG program described in Chapter 3.
<!>
WARNING:
. Only pick up the ROM by the plastic carrier. Do not touch the metal
pins of the ROM with your fingers. This can cause the pins to cor-
rode, and could also destroy the program contained in the ROM.
b) Using the ROM as a disk to contain data or BASIC programs.
Some application programs may use data which is provided in ROM form. The
manual which comes with the program will describe how to use this data. The
program will have a command or specifically prompt you to change the ROM.
Alternatively the manual may tell you to change the ROM in order to run the
BASIC program.
If
the program is a BASIC program you can use it from ROM
as follows:
1) When you have loaded BASIC, switch the computer off in the continue
mode by switching the power off while pressing the
1
CTRL
I
key.
2) Remove the BASIC ROM, and insert the program ROM as in steps 4 to
7 of the description of changing the ROM.
3) Switch the power back on.
4) From the BASIC command line type the RESET command followed by
the [RffiTFfN] key.
5) You can now load the program or data from the ROM, treating it as any
other drive.
4-18
4.1.3 RAM Disk Unit - additional RAM disks
Previous chapters have described the use of part of the memory area to store
programs. This is referred to as the RAM disk. The size of RAM disk in the
main memory is at most 24K bytes.
If
your applications require more memory
space, an optional RAM disk unit of larger capacity can be connected to the
system bus connector. This is known as an Intelligent RAM disk
Two types of optional RAM disk units are available: one is of 60K bytes (Model
HI02A) and the other is of 120K bytes (Model HI03A). (These units actually
contain 64K and 128K of RAM. However, some RAM is used by the firmware
so is not all available to the user.)
When an Intelligent RAM disk unit is connected, the internal RAM disk can-
not be used. When fitting an additional RAM Disk Unit the PX-8 must be in-
itialized, and the disk formatted in the same way as the RAM disk which uses
part of the internal memory. When initializing either pressing a 7508 (sub-CPU)
reset switch or using the
I
SHIFT
1- IG~~~lkeys
while pressing the reset button,
the PX-8 will know that an external disk is connected. There will be no request
for the size of the RAM disk, but it will still be necessary to format the disk.
If
you try to write to the RAM disk when the write protection switch is on,
a BDOS error messaage will be displayed on the screen.
4-19