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Vector ZCB Single Board computer
2.3.1 2708 EPROM Addressing
2708 type EPROMs are the easiest type of PRCM to chose ••• they are the
factory standard and the board is prejumpered to use them.
The standard
jumper ing of the ZCB provides for the Vector Graphic 4.0 Monitor addressed
at EDOOH.
The board is prejumpered to use 2708
1
s at the following memory
addresses:
PRCM 1
U20
PRCM 2
U2l
PRCM 3
U22
RAM
U24,25
EOOOH-E3FFH
E400H-E7FFH
ECOOH-EFFFH
FCOOH-FFFFH
The span between FOOOH and FBFFH is taken up, in the standard Vector
System, by the Flashwriter
I I
board and the Disk Controller board.
There is
a lK gap in meIIDry from E800H to EBFFH
if
standard jumpering is used.
If you want to change EPROM/RAM memory addresses within the memory
address block EOOOH to FFFFH, use the following procedure.
1) Subtract EOOOHfran the desired PRCM or
RAM
base address.
2) Consult the lK column of the Relative Address Chart (below) to detennine
the jumper area F pad number which corresponds to the result obtained in
step 1.
3) Consult the Area F EPRCM/RAM Socket Pad Chart to determine the pad number
of the particular socket you wish to change.
4) SOlder a jumper between the
two
pads.
5) Cut away any pre-existing jumpers as necessary.
Relative Address Chart
Increment
lK
2K
Area F Pad
No.
(all addresses
14
0000-03FF
0000-07FF
13
0400-07FF
0800-0FFF
12
0800-0BFF
1000-17FF
11
OCOO-OFFF
1800-lFFF
10
lOOO-13FF
2000-27FF
9
l400-17FF
2800-2FFF
8
1800-1BFF
3000-37FF
7
lCOO-lFFF
3800-3FFF
Rev. I-B
6/11/80
4K
in hex)
OOOD-OFFF
lOOO-lFFF
2000-2FFF
3000-3FFF
4000-4FFF
5000-5FFF
6000-6FFF
7000-7FFF
2-3
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