Apple-2-SW/apple2_hgr_font_tutorial
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Seperate HgrLo HgrHi

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michaelangel007 2016-01-09 13:17:32 -08:00
parent 804c2ec70f
commit 169968893f
1 changed files with 22 additions and 17 deletions
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@ -702,7 +702,7 @@ Recall we'll re-use our existing font drawing code at $0352:
365:60 RTS
```
We just need to touch up our entry point from $0352 to $033B:
We just need to touch up our entry point from $0352 ScreenPtrToTempPtr() to $033B DrawCharCol():
```assembly
307:4C 3B 03 JMP $033B ; DrawCharCol()
@ -934,12 +934,14 @@ This is our mini HGR Y Address look-up table. "Funny" that it has 24 entries --
Enter these bytes:
; HgrLo EQU $6400
Our `HgrLo` table:
6400:00 80 00 80 00 80 00 80
6408:28 A8 28 A8 28 A8 28 A8
6410:50 D0 50 D0 50 D0 50 D0
; HgrHi EQU $6418
Our `HgrHi` table:
6418:00 00 01 01 02 02 03 03
6420:00 00 01 01 02 02 03 03
6428:00 00 01 01 02 02 03 03
@ -980,12 +982,17 @@ Enter in:
Now we can print a char at any location:
```assembly
1100:A9 41 ; A-register = char
1102:A0 01 ; Y-register = col 1
1104:A2 02 ; X-register = row 2
1102:A0 01 ; Y-register = col 1 (2nd column)
1104:A2 02 ; X-register = row 2 (3rd row)
1106:4C 20 03 ; DrawCharColRow( c, col )
1100G
````
Enter in:
1100:A9 41 A0 01 A2 02 4C 20 03
1100G
## Natural Params CursorColRow()
@ -1114,6 +1121,7 @@ Enter:
1200:A2 03 A0 02 20 79 03
1207:A2 12 A0 0E 4C 8E 03
120E:48 65 6C 6C 6F 20 57 6F 72 6C 64 00
1200G
Note: An easy way to get the hex bytes for a string is to use this tiny Javascript snippet to convert a text string to hex:
@ -1127,25 +1135,22 @@ Note: An easy way to get the hex bytes for a string is to use this tiny Javascri
Here are all the routines we've entered in so far:
300:20 66 03 A9 00 A0 00 4C 52 03
300:20 66 03 A9 00 A0 00 4C 3B 03
310:20 3B 03 4C 70 03
320:48 20 28 03 68 4C 3B 03
328:BD 00 64 18 65 E5 85 F5
330:BD 18 64 18 65 E6 85 F6 60
33B: 48 29 1F 0A 0A
330:BD 18 64 18 65 E6 85 F6
33A:60 48 29 1F 0A 0A
340:0A 69 00 8D 55 03 68 29
348:60 2A 2A 2A 2A 69 60 8D
350:56 03
352: A2 00 BD 00 62 91
350:56 03 A2 00 BD 00 62 91
358:F5 18 A5 F6 69 04 85 F6
360:E8 E0 08 D0 EF 60
366: A5 E5
360:E8 E0 08 D0 EF 60 A5 E5
368:85 F5 A5 E6 85 F6 60
370:C8 18 A5 F6 E9 1F 85 F6 60
379: 86 F5 B9 00 64 18 65
370:C8 18 A5 F6 E9 1F 85 F6
378:60 86 F5 B9 00 64 18 65
380:E5 65 F5 85 F5 B9 18 64
388:18 65 E6 85 F6 60
38E: 84 F0
388:18 65 E6 85 F6 60 84 F0
390:86 F1 A0 00 B1 F0 F0 07
398:20 10 03 C0 28 90 F5 60