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README.md
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README.md
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#Apple ]\[ //e HGR Font 6502 Assembly Language Tutorial
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Revision: 42, Jan 26, 2016.
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Revision: 43, Jan 26, 2016.
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# Table of Contents
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@ -750,12 +750,14 @@ Here's the disassembly of our (hard-coded) DrawChar() program:
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Enter in:
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```
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900:20 0A 09 A9 00 A0 00 4C 10 03
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90A:A5 E5 85 F5 A5 E6 85 F6 60
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310:4C 50 03
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350:A2 00 BD 00 62 91 F5 18
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358:A5 F6 69 04 85 F6 E8 E0
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360:08 D0 EF 60
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```
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We're almost ready to run this! We just need to initialize one variable -- where to draw the glyph at:
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@ -1006,9 +1008,11 @@ We just need to touch up our entry point `PrintChar` at $0310 instead of calling
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Enter in:
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```
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310:4C 4C 03
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34C:A6 F6 86 FD
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363:C8 A6 FD 86 F6 60
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```
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Let's try it out:
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@ -1379,12 +1383,14 @@ We need to (again) touch up our `DrawChar` entry point at $0310 calling `_DrawCh
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Enter in:
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```
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B00:20 0A 09 A9 00 A0 00 4C 10 03
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310:4C 3A 03
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33A:2A 2A 2A AA 29 F8
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340:8D 53 03 8A 29 03 2A 69
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348:60 8D 54 03
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B00G
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```
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We should now see an closed apple glyph!
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@ -1813,10 +1819,11 @@ This is a little clunky but it is progress. Let's write the new SetCursorColRow(
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Enter in:
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```
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321: 86 F5 B9 A0 03 18 65
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328:F5 85 F5 B9 B8 03 18 65
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330:E6 85 F6 60
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```
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# DrawString()
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@ -1867,6 +1874,7 @@ And our example to verify that it works:
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Enter in:
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```
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37E:84 F0 86 F1 A0 00 B1 F0
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386:F0 07 20 10 03 C0 28 90 F5 60
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@ -1874,6 +1882,7 @@ Enter in:
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1207:A2 12 A0 0E 4C 7E 03
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120E:48 65 6C 6C 6F 20 57 6F 72 6C 64 00
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1200G
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```
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@ -2023,6 +2032,7 @@ And here is the assembly:
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Enter in:
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```
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1300:A9 00 85 F3 85 E5 A9 20
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1308:85 E6 A4 F3 C0 18 B0 22
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1310:A2 00 86 F2 20 21 03 38
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@ -2030,12 +2040,15 @@ Enter in:
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1320:F7 A4 F2 B1 F7 29 7F 20
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1328:3A 03 C0 28 90 F5 E6 F3
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1330:D0 D8 60
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```
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And now for the moment of truth! Don't worry if you can't see what you are typing.
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```
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FC58G
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1300L
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1300G
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```
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Voila!
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@ -2064,12 +2077,15 @@ Using one of the newer emulators with NTSC emulation, unfortunately, doesn't hel
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And just to prove that it copied the bottom 4 text rows as well:
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```
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C052
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```
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And to restore the bottom 4 text rows
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```
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C053
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```
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# Exercises
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@ -2105,7 +2121,7 @@ Hey! Homework? Yes, the only (true) way to demonstrate you understand the theo
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Here are all the (core) routines we've entered in so far:
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```
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0301: 48 6A 6A 6A 6A 20 0A
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0308:03 68 29 0F AA BD 90 03
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0310:4C 3A 03 BD A0 03 85 F5
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@ -2128,6 +2144,7 @@ Here are all the (core) routines we've entered in so far:
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03B8:00 00 01 01 02 02 03 03
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03C0:00 00 01 01 02 02 03 03
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03C8:00 00 01 01 02 02 03 03
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```
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(To save this: `BSAVE CODE_0300.BIN,A$300,L$D0`)
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@ -2284,6 +2301,7 @@ We could code this up as:
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Enter in:
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```
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1900:A2 00 BD A0 03 85 FA BD
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1908:B8 03 05 E6 85 FB E8 BD
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1910:A0 03 85 F8 BD B8 03 05
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@ -2296,6 +2314,7 @@ Enter in:
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1948:00 A0 27 91 F8 88 10 FB
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1950:18 A5 F9 69 04 85 F9 CA
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1958:D0 ED 60
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```
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Excellent.
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@ -2308,6 +2327,7 @@ We could manually unroll every loop such as this monstrosity (we trade space for
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Enter this (or download [hgr_scroll_up.bin](hgr_scroll_up.bin) or `BRUN HGR_SCROLL_UP`):
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```
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1400:A2 27
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1402:BD 00 24 9D 00 20
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1408:BD 00 28 9D 00 24
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@ -2503,7 +2523,7 @@ Enter this (or download [hgr_scroll_up.bin](hgr_scroll_up.bin) or `BRUN HGR_SCRO
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187C:A9 00 9D D0 3F
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1881:CA 30 03 4C 02 14
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1887:60
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```
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And let's write a little demo ...
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@ -2517,23 +2537,29 @@ And let's write a little demo ...
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Enter in:
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```
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13F7:A0 C0 20 00 14 88 D0 FA 60
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```
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(To save to disk type `BSAVE HGR_SCROLL_UP.BIN,A$13F7,L$490`)
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And let's try it out:
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```
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1300L
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1300G
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1400G
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1400G
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1400G
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```
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And for the finale:
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And for the grand finale:
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```
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13F7G
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```
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Sweet !
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