E x p a n s i o n C a r d s
LS/VS 550 OWNER’S HANDBOOK 4/7
Note
Memory addresses are always written in base 16 (hexadecimal
notation). Hexadecimal uses sixteen digits (0-9 and A-F, where A=10,
B=11 and so on up to F=15). Hexadecimal numbers are denoted either by
the suffix “h” or by the prefix “0x”. The final digit of a five-digit memory
address is often omitted, so C8000h may be written as C800h. Since amounts
of memory are usually stated as kilobytes rather than in hexadecimal notation,
the following conversion table may be helpful:
4 Kbytes = 1000h 8 Kbytes = 2000h 16 Kbytes = 4000h
32 Kbytes = 8000h 64 Kbytes = 10000h 128 Kbytes = 20000h
The card’s documentation should list its possible base memory
addresses. You will also need to know how much memory the card
has, so that you can leave the right gap between this card’s base
address and the next.
Cards often come with pre-configured or default settings. It is best
to rely on these settings as much as possible, and change them only
if they conflict with other devices.
Installing the card
Installing expansion cards can be one of the most difficult
operations you may ever perform within your computer. If you are
in any doubt, or come into difficulties you are unable to resolve,
contact the supplier of the expansion card or ask your Apricot dealer
for advice or assistance.
1. Turn off the computer and unplug all power cords.
2. Take suitable anti-static precautions and remove the rear system
unit cover, detailed instructions are provided in Appendix A,
“Inside the System Unit”.
