AEG SB4 series User Manual Page 189

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34
ALU 011, ALU 012, ALU 021
177
Memory write protection WP3 ... WP8:
Segments 1 ... 8 from the total of 32 segments of the whole memory areal always have
writing enabled. With segments 9 ... 24 6 groups are formed for setting the writing pro-
tection, to which switches are assigned. These switches can be operated from a front
panel part which is covered by a label. The switches are effective only when equipped
with RAM.
With the DIP switches WP3 ... WP8 writing protection is set for the segments given in
the label
in position ON (writing disabled) or
in position OFF (writing enabled) = delivery status
PMB
PMB
9+10
11+12
13+14
15+16
17-20
21-24
WPx Segm. HEX Address Capacity
3 9 + 10 40000 ... 4FFFF 64 kbytes
4 11 + 12 50000 ... 5FFFF 64 kbytes
5 13 + 14 60000 ... 6FFFF 64 kbytes
6 15 + 16 70000 ... 7FFFF 64 kbytes
7 17 ... 20 80000 ... 9FFFF 128 kbytes
8 21 ... 24 A0000 ... BFFFF 128 kbytes
writing enabled
Switch position
writing disabled
RAM insertion
When field 2 is equipped with EPROM and a RAM > 128 kbytes is
required (available in field 1), a RAM area of 64 kbyte or 128
kbyte, which is otherwise not in field 1, can be activated using the
jumper W23 and DIP switches WP1, WP2. However, this increase
in RAM is obtained at the cost of the EPROM address area of the
ALU. The possibilities obtained through this measure are given in
Table 41.
Table 41 RAM insertion
W23 WP1 WP2 Meaning ALU capacity Insertion
1 -- 2 OFF OFF 64 KB PMB window on segment 3/4 128 K RAM --
2 -- 3 OFF OFF (as delivered) 256 K EPROM --
2 -- 3 OFF ON 64 KB PMB window on segment 3/4 128 K RAM 64 K RAM
RAMfromsegm.3/4
inserted to segm. 15/16 192 K EPROM
1 -- 2 OFF ON 64 KB PMB window on segment 3/4 128 K RAM 64 K RAM
RAMfromsegm.3/4
inserted to segm. 11/12 192 K EPROM
2 -- 3 ON OFF 128 KB PMB window on segment 3...6 64 K RAM 128 K RAM
RAMfromsegm.3/4
inserted to segm. 15/16 192 K EPROM
1 -- 2 ON OFF 128 KB PMB window on segment 3...6 64 k RAM 128 K RAM
RAMfromsegm.3/4
inserted to segm. 11/12 192 K EPROM
2 -- 3 ON ON 128 KB PMB window on segment 3...6 64 K RAM 128 K RAM
RAM from segm. 3...6
inserted to segm. 13...16 128 K EPROM
1 -- 2 ON ON 128 KB PMB window on segment 3...6 128 K RAM 128 K RAM
RAM from segm. 3...6
inserted to segm. 11...14 128 K EPROM
W23
1
PMB
PMB
off on
WP1, 2
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