Amiga Hardware Manual Errata_ENG.pdf

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Errata for the
Amiga Hardware Manual
The attached documents contain various updates to the
Amiga Hardware Manual.
The documents
are:
Changes and Additions
Read this first; it contains miscellaneous corrections and is a guide to all of the updates.
Examples
Contains example assembly code sequences for the Copper, play fields, and sprites.
Addendum to Chapter 5: Audio Hardware
Describes the audio state machine.
Addendum to Chapter 6: Blitter Hardware
Describes blitter DMA and how the operation of the blitter affects the performance of the
rest of the system.
Appendix F
This replaces the presen t Appendix F.
Appendix G
This replaces the presen t Appendix G.
October 17, 1985
1
Changes and Additions to the
Amiga Hardware Manual
Changes and additions have been made to the following chapters and appendixes of the
Amiga
Hardware Manual.
Chapter 2: Coprocessor Hardware
Add the examples in the attached document called "Examples for the Amiga Hardware Manual".
Chapter 3: Playfield Hardware
Add the examples in the attached document called "Examples for the Amiga Hardware Manual".
Chapter 4: Sprite Hardware
Add the examples in the attached document called "Examples for the Amiga Hardware Manual".
On page 4-14, under section 4.3, "Displaying a Sprite", add the following:
CAUTION
Should sprite DMA be turned off while a sprite is being displayed (that is, after VSTART
but before VSTOP), the system will continue to display the line of sprite data that was
most recently fetched. This causes a vertical bar to appear on the screen. It is recom-
mended that sprite DMA only be turned off during vertical blanking or during some por-
tion of the screen where you are
sure
that no sprite is being displayed.
October
17, 1985
1
Chapter 5: Audio Hardware
Add the attached document called "Addendum to Chapter 5: Audio Hardware".
Chapter 6: Blitter Hardware
Add the attached document called "Addendum to Chapter 6: Blitter Hardware".
On page
6-14,
under section 6.11, "Line. Drawing", add the following line to the table:
Register
Name
BLTCONI
Bit
Number
5
Bit
Name
State
~~~---------------
Purpose
o
Reserved for ftabloden mode
On page 6-8, add the following to section 6.6, "Ascending and Descending Addressing":
If
the source and destination data areas overlap in a blitter operation, there is a possibility of
writing to a particular location as the destination before it was read as the source.
To prevent this kind of data destruction, you must take care to correctly choose ascending or
descending mode, and possibly you should offset the source or destination.
Some types of overlapped blitter moves will always result in damaged data; therefore, the
desired move must be done in two steps:
1.
Move to a safe place.
Move to desired destination.
2.
Using the blitter Memory Bus Activity Table
l ,
you can observe the order of operations and
determine the required offset or mode. Pay careful attention to the notes. It helps to draw pic-
tures.
This table is located in the separate "Addendum to the Blitter Hardware
Chapter" attached to this document.
1
2
October 17, 1985
Chapter 8: Interrace Hardware
On page 8-4, under "Counter Limitations", the la8t line should read:
**
45-200
=
-155. Because the absolute value exceeds 127, the true count must be
Appendix A
On page
4,
in the table called
"LINE
MODE (line draw)", change the following bits for BL TCONl:
BIT#
15
14
13
13
BLTCONO
START3
START2
START 1
STARTO
BLTCONI
TEXTURE3
TEXTURE2
TEXTURE 1
TEXTUREO
05
LF5
o
(Reserved for
new mode)
On page 5, in the table called
"LINE
MODE (line draw)", change the line beginning "OVF ... " to:
o
Reserved for new mode
At the end of the same table, add:
The "B" source is used for texturing the drawn lines.
Appendix B
On page 2, after "BLTCDAT", "BLTBDAT", and "BLTADAT", change
"&"
to
"%".
October 17, 1985
3
Appendix F
Remove Appendix F and insert the attached new Appendix F. Appendix F contains a new front
section, called "Brief address map for 8520's".
Appendix G
Remove Appendix G and insert the attached new Appendix G. Appendix G has some mlllor
changes.
Since this appendix is subject to change, anyone who is actually designing a device to interface to
the Amiga should contact Amiga Third-Party Support.
Appendix I
This is a new appendix.
It
describes the interface to the 68000 bus connector.
4
October 17. 1985

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