Specifications

A-2 Issue 5, August 1994 Appendix A
Mini Expansion Card Specification
Power specification
The following table gives the maximum power
requirements for the mini expansion card.
Note: The external 2.5W allocation must not be
dissipated inside the case as the additional heating may
cause a reduction in reliability.
Mechanical specification
The physical dimensions and component clearance
dimensions of the mini expansion card are specified in
the drawing called the Mini Expansion Upgrade,
(0280,080). An EMC gasket to drawing 0294,081 is also
required on A3010 and A3020 machines to maintain
EMC performance when a mini expansion card is fitted.
Additional points
Each card should, whenever possible, be marked on the
external face of the panel with the manufacturer’s ID and
the expansion card ID.
Access to these machines is covered by the Welcome
Guide. Instructions must be supplied to detail how the
mini expansion card and label are fitted, thus allowing
users to upgrade these machines themselves, and to test
that the installation has been done correctly.
Inside machine External
Mini expansion card 100mA 500mA
Maximum power dissipation 500mW 2.5W
Signals
The following signals are defined in the Acorn Enhanced
Expansion Card Specification (note that pin 1 is at the
lefthand end of the plugs as viewed in Figure 1 below):
Figure 1: Top view of mini expansion card
Plug position A B C D
Pin
1 0V 0V C0 +5V
2 +5V REF8M C1
PWE
3 PRE PFIQ B1 PS1
4 PR/nW MS1 IORQ CLK2
5 LA4 +5V IOGT LA2
6 LA5 LA3
7 LA6 BD0
8 LA7 BD1
9 0V BD2
10 LA8 BD3
11 LA9 BD4
12 LA10 BD5
13 LA11 BD6
14 LA12 BD7
15 LA13 RST
16 PIRQ 0V
17 0V +5V
A B C D
Plug positions
Back panel