Epson PX-8 - Page 123

REV.-A
0000 0020
One to three
Header
directories
0 1 2 3
4
E5H37H
Capacit~ Check SUM
i~ KB
I
L
H
ROM Name (continued)
5
MINI: 0040
MAX: 03FF
5
7
System Name
n
"V"
Data block
8 9 A
Version No.
00-99
M
A
2764 : 1FFF
27128: 3FFF
27256 7FFF
--
---------
B C
0
E-£
ROM Name
Date
M D D
Y Y
Number of directory entries plus 1
Fig. 2-102 ROM Data Format
• "E5" at the beginning of the header is the null code and has no special meaning. This null code
is
put here merely because the operating system deals with ROM as it would a floppy disk
which always contains "E5". (The null code is written on all floppy disks when initialized.)
•
"37" in the second header byte position indicates that the file is to be used with this computer.
• Two ROM capsules may be dealt with as a single floppy disk drive. By setting the most signifi-
cant bit (NSB) of the third byte in the first ROM header (for lower address space) to 1, the entire
second ROM capsule can be used as a data block.
2-99