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Vector ZCB Single Board Canputer
Area F EPRCM/RAM SOcket Pad Chart
Pad 1 connects EPROM 0 (U20) to its address.
Pad 6 connects EPRCM 1 (U21) to its address.
Pad 2 connects EPRCM 2 (U22) to its address.
pad 3 connects RAM (U24,25) to its address.
If you want
to
use 2708's and change memory locations outside of the
standard block (EOOOH-FFFFH) use the following procedure.
1)
r:.etermine which 8K memory block you want to use from the 2708 Base
Address Chart below.
2)
Rejumper Area H as specified
and
cut away any pre-existing jumpers as
necessary.
3)
Use the Relative Address Chart (above) to determine the actual EPRCM/RAM
pad assignments within Jumper Area F as described in the last section.
4)
Solder Area F jumpers as required
5)
Cut away any pre-existing jumpers as necessary.
2708 Base Address Chart
Addresses
OOOOH-IFFFH
200OH-3FFFH
4000H-5FFFH
6000H-7FFFH
8000H-9FFFH
AOOOH-BFFFH
COOOH-DFFFH
EOOOH-FFFFH
Area H Jumpers
1-7,2-5,3-9
1-6,2-5,3-9
1-7,2-4,3-9
1-6,2-4,3-9
1-7,2-5,3-8
1-6,2-5,3-8
1-7,2-4,3-8
1-6,2-4,3-8*
Area I Jumpers
No
change
Std: 3-6,4-7,5-8
Area J Jumpers
No
change
Std: 2-4,5-7
*
Standard Area H Jumpering
2.3.2 Auxiliary Memory Disable
If
you want to disable 1 or 2
1-K
increments of main meTIDry (perhaps to
use an auxiliary disk controller or video board.) jumper pad 4 and/or 5 of
jumper area F to the pad representing the absolute address desired.
This meTIDry disable feature will ltwDrk with whatever EPRCM type is chosen
except that the interval disabled will be 2K if the board has been
configured for 2716's and 4K if the board has been set up for 2732's.
2-4
Rev. I-B 6/11/80
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