Amiga A4000 - SIMM Size Jumper; Chip Memory; Chip RAM Simms

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Adding Memory

Table 4-1. Fast

RAM

configurations

Amount

of

Fast RAM

SIMM Size 8ank{s) Filled

1 megabyte

1

MB

°

2 megabytes

1

MB

0,

1

3 megabytes

1

MB

0,1,2

4 megabytes

1

MB

0,1,2,3

4 megabytes

4MB

°

8 megabytes

4MB

0,1

12 megabytes

4MB

0,1,2

16 megabytes

4MB

0,

1,2,3

Note

that

the

two sizes

cannot

be mixed

within

the

Fast

RAM

section.

The

physical packaging

of

Fast

RAM SIMMs

must

be

single-sided, 1 inchl2.54 cm or less

in

height.

SIMM Size Jumper

4-3

There

is

one

jumper,

SIMM SIZE,

that

is

associated

with

Fast

RAM.

It

must

be

set

correctly according to

the

size of

the

installed

SIMMs.

Its

two positions

are

labeled "lM" for 4 megabyte SIMMs;

and

"256K" for 1 megabyte SIMMs. See Appendix D for

the

jumper's

location

on

the

motherboard.

Chip Memory

Chip memory, also known

as

graphics

memory

or

Chip RAM,

stores

graphics, sound,

and

other

data

that

must

be accessible to

the

Amiga custom chips.

Running

software

that

requires

large

amounts

of

this

type

of memory, especially

when

multitasking,

can

quickly

exhaust

1

megabyte

of

Chip RAM. Chip RAM occupies

the

innermost

SIMM socket on

the

motherboard.

Chip RAM SIMMs

An

Amiga

with

one megabyte

of

Chip RAM

can

be

upgraded

to two

megabytes

by

changing

the

SIMM

in

the

Chip

RAM socket to a

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