Apple-2-SW/apple2_hgr_font_tutorial
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Added bsave commands, changed scroll up demo address

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michaelangel007 2016-01-10 18:39:47 -08:00
parent 51c260dc09
commit f90dd02144
1 changed files with 28 additions and 10 deletions
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README.md
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@ -503,7 +503,10 @@ Enter in (or download [Raw Binary Font](font.bin) and with AppleWin press `F7`,
63E0:08 08 08 08 08 08 08 08 ; |
63E8:0E 18 18 30 18 18 0E 00 ; }
63F0:2C 1A 00 00 00 00 00 00 ; ~
63F8:00 2A 14 2A 14 2A 00 00 ;
63F8:00 2A 14 2A 14 2A 00 00 ;
(To save this: `BSAVE FONT.BIN,A$6000,L$400`)
### Image to Font Data (Javascript)
@ -1327,6 +1330,8 @@ Here are all the routines we've entered in so far:
390:86 F1 A0 00 B1 F0 F0 07
398:20 10 03 C0 28 90 F5 60
(To save this: `BSAVE CODE_0300.BIN,A$300,L$A0`)
We also have a mini HGR Y address lookup table:
6400:00 80 00 80 00 80 00 80
@ -1336,6 +1341,8 @@ We also have a mini HGR Y address lookup table:
6420:00 00 01 01 02 02 03 03
6428:00 00 01 01 02 02 03 03
(To save this: `BSAVE HGR_TABLE.BIN,A$6400,L$30`)
What's left? Quite a few things actually:
* Copy the 40-Column text screen to HGR
@ -1552,7 +1559,7 @@ Hey! Homework? Yes, the only (true) way to demonstrate you understand the theo
Hope this HGR font tutorial helped you understand the inner workings of a font blitter!
Happy (Apple ][ //e //c) Hacking!
Happy (Apple ]\[ //e //c) Hacking!
Michael "AppleWin Debug Dev"
@ -1569,7 +1576,7 @@ There are many different ways to solve this depending if we want to prioritize s
We could manually unroll every loop such as this monstrosity (we trade space for speed):
Enter this:
Enter this (or download [hgr_scroll_up.bin](hgr_scroll_up.bin) or `BRUN HGR_SCROLL_UP`):
1400:A2 27
1402:BD 00 24 9D 00 20
@ -1767,25 +1774,36 @@ Enter this:
1881:CA 30 03 4C 02 14
1887:60
And let's write a little demo ...
```assembly
1380:A0 C0 LDY #C0
1382:20 00 14 .1 JSR ScrollHgrUpPixel
1385:88 DEY
1386:D0 FA BNE .1
1388:60 RTS
13F7:A0 C0 LDY #C0
13F9:20 00 14 .1 JSR ScrollHgrUpPixel
13FC:88 DEY
13FD:D0 FA BNE .1
13FF:60 RTS
```
Enter in:
1380:A0 C0 20 00 14 88 D0 FA 60
13F7:A0 C0 20 00 14 88 D0 FA 60
(To save to disk type `BSAVE HGR_SCROLL_UP.BIN,A$13F7,L$490`)
And let's try it out:
1300L
1300G
1380G
1400G
1400G
1400G
![Screenshot 21](pics/hgrfont_21.png?raw=true)
And for the finale:
13F7G
Sweet !