2716 Eprom Addressing - Vector ZCB User Manual

Vector ZCB Single Board canputer
2.3.3 2716 EPROM Addressing
To
use 2716's in the ZCB, follow the procedure outlined belav.
1) Consult the 2716 Base Address Chart (below). This shows the base
addresses allowable with 2716's.
2716 Base Address Chart
Addresses
Area H Jumpers Area
I
JLnTlpers Area J Jumpers
OOOOH-3FFFH 1-2,2-5,3-9
8-4,7-3,6-2
3-4,6-7
4000H-7FFFH 1-2,2-4,3-9
8-4,7-3,6-2
3-4,6-7
8000H-BFFFH 1-2,2-5,3-8
8-4,7-3,6-2
3-4,6-7
COOOH-FFFFH 1-2,2-4,3-8
8-4,7-3,6-2 3-4,6-7
2) With the base address chosen, Jumper area H,
I
and J as per chart and cut
away old jumpers as necessary.
3) Subtract the base address fram the absolute address desired to determine
the relative address. Consult the 2K column of the Relative Address Chart
to find the appropriate Area F pad number.
4) Consult the Area F EPROM/RAM Socket Pad Chart to find the second pad
number.
5) SOlder jumper(s) as required.
6) Cut away any previous jumpers as necessary.
For example, let us say that we wish to use 3-2716' s on our ZCB board
and want to use an auxiliary disk controller with our system. We want to
address U20 at AOOOH, U21 at BOOOH and U22 at B800H. The lK of on-board
RAM
will be addressed at 9800H and the disk controller will be at 8800H. Note
that there will only be lK of memory beginning at location 9800H with lK
blank following it.
To
implement this change, we \\Ould first consult the 2716 Base Address
Chart. Since all these addresses lie within the third block
we
jumper area
H as follows: 1-2, 2-5 and 3-8; area I : 8-4, 7-3 and 6-2; and area J: 3-4
and 6-7. All pre-existing jumpers are cut away.
Now that the base address has been established, we consult the relative
address chart and make the following connections in jumper area
F:
1 to 10,
6
to 8,
2
to 7 and 3 to 11. (Cutting away previous jumpers as necessary.)
To
enable the disk controller, pad 4 is tied to pad 13.
Rev.
I-B
6/11/80
2-5