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Added Apple II Notes

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Added information for the Apple 2 port by Oliver Schmidt.
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StewBC 2020-01-19 09:04:35 -08:00
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0. Updates
I. Introduction
Jan 2020 - Oliver Schmidt created a beautiful Apple II port. See IX below.
I. Introduction (Feb 14, 2014)
I started playing chess about 3 months ago and this got me wondering how
difficult it would be to make a computer chess game. I decided to try and
@ -185,5 +188,82 @@ Feel free to send me an email if you have any comments. If you do make a port
or something else, I would love to hear about it!
swessels@email.com
Feb 14, 2014
Thank you!
Thank you!
IX. Apple II Specific Version Information
General display uses the Apple II hires mode accessed via custom asm
functions.
Menu display uses the 4 line bottom text option of the Apple II hires mode via
cc65 CONIO functions.
All hires access is byte aligned, therefore the horizontal resolution is 40
(bytes).
Hires access is done via simple (binary) ROPs (raster operations) by using
actual 6502 (immediate) opcodes.
The C64 and Curses implementation both make heavy use of colors while Apple II
implementation mustn't depend on (but may benefit from) colors. Therefore the
user-operated cursor inverts the border of the current field. It's hard to find
a compromise between making the cursor visible well and showing the piece
"under" the cursor well. Additionally it is desirable to show different cursor
states (empty, invalid, valid). The approach chosen is to have different
thicknesses of the inverted border:
Valid: Thin
Invalid: Medium
Empty: Thick
When it comes to showing attackers/defenders (via the keys 'a'/'d') there's no
alternative to resorting to colors:
Attackers: Red
Defenders: Green
So the only field display variant left is the piece selected for moving. Instead
of introducing a third type of highlighting (beside border inversion and
coloring) it is simply colored Magenta. The reasoning:
On a monochrome display the user won't have much fun showing attackers/defenders
anyway. And without showing those the selected piece is the only colored (aka
striped) piece making it clearly visible.
On a color display a third color (beside attackers/defenders) works just fine.
As the Apple II doesn't have cursor-up and cursor-down keys the keys 'o' and 'l'
work as alternatives to the those cursor keys.
Oliver Schmidt
Jan 19, 2020
X. Apple II Build Instructions
To build the Apple II version use the make command line:
make TARGETS=apple2 OPTIONS=optspeed
How you build a disc image is dependent on your system. In the apple2 folder is
a disc template and using Apple Commander, the following commands would work
(provided Apple Commander is added to the Apple 2 folder for these examples).
There is a build.cmd file that contains the below "instructions" as well.
copy apple2\template.dsk cc65-Chess.dsk
java -jar apple2\AppleCommander-win64-1.5.0.jar -p cc65-Chess.dsk chess.system
sys < \cc65\target\apple2\util\loader.system
java -jar apple2\AppleCommander-win64-1.5.0.jar -as cc65-Chess.dsk chess
bin < cc65-Chess.apple2
NOTES:
1) The path to the loader.system depends on where you have cc65
installed. You will need to replace \cc65\target\apple2\util\loader.system with
your own local path to the cc65 provided loader.system.
2) The lines starting with java are single lines (no line breaks - the redirect
"<" is all on the same line).
3) Find AppleCommander here (I used Version 1.5.0):
https://github.com/AppleCommander/AppleCommander/releases