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Intermec EasyCoder 201 II – Technical Manual
P-24
Jumper(s) on P-24 selects if EPROM's or Flash Memory packages
can be fitted on IC-1 thru IC-4 (also see note):
One horizontal jumper on the two lower pins selects EPROM's
Two vertical jumpers selects 4 Mbit Flash Memory
IC-5, IC-6, IC-7 and IC-8
In these sockets either two or four SRAM packages, which contain
the printer's working and storage memory, can be fitted. The SRAM
packages must have an access time of max. 120 ns and be fitted in
couples (first couple on IC-5 and IC-6, second on IC-7 and IC-8).
All SRAM packages must be of the same type and size:
• 2
×
32 kbyte (256 kbit) = 64 kbyte (0.5 Mbit)
• 4
×
32 kbyte (256 kbit) = 128 kbyte (1 Mbit)
• 2
×
128 kbyte (1 Mbit) = 256 kbyte (2 Mbit)
• 4
×
128 kbyte (1 Mbit) = 512 kbyte (4 Mbit)
• 2
×
512 kbyte (4 Mbit) = 1 Mbyte (8 Mbit)
• 4
×
512 kbyte (4 Mbit) = 2 Mbyte (16 Mbit)
P-21
A jumper must be fitted on P-21 to specify the size of the individual
RAM packages fitted on IC-5 thru IC-8:
Pin 1–2 (upper position):
512 kbyte
Pin 2–3 (lower position):
32 or 128 kbyte
The size of the SRAM packages must be defined by a GAL circuit,
see below.
The RAM memory is battery backed-up to avoid loss of data when
the printer is turned off or if the power fails. The NiCd-accumulator
is automatically recharged when the power is on. After having
installed the printer, leave the power on overnight to allow the
battery to become fully recharged. If the printer is kept turned on
less than full working hours, it is recommended to leave the power
on overnight at least once a week. Do not leave the printer off for
several weeks (e.g. during holidays) without having made a full
memory backup on a computer disk.
ELECTRONICS, cont'd.
Continued!
RAM Size Strap
EPROM/Flash Memory Strap
RAM Memory
P-24
EPROM's
P-24
FLASH
Note:
Before switching from EPROMs to Flash
memory circuits, the RAM memory must
be erased.
If encountering problems when using cer-
tain brands of EPROMs, try setting straps
as follows:
P-21:
Pin 2–3 (lower position)
P-22:
Pin 1–2 (upper position)
P-24:
No straps fitted