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apple2_hgr_font_tutorial
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Added screenshots for fat font j

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michaelangel007 2016-01-28 10:29:39 -08:00
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#Apple ]\[ //e HGR Font 6502 Assembly Language Tutorial
Revision: 63, Jan 28, 2016.
Revision: 64, Jan 28, 2016.
# Table of Contents
@ -40,6 +40,10 @@ Revision: 63, Jan 28, 2016.
* Other Fonts
* Fat Stroke Fonts
* Beautiful Boot
* Fat Font: S
* Fat Font: X
* Fat Font: 2
* Fat Font: j
* What's Next?
* Conclusion
* Solutions
@ -2541,6 +2545,9 @@ Here is a table of all the glyphs that we'll eventually fix:
Alrighty then.
### Fat Font: S
The first glyph that stands out is the `S`. Our rule is:
* Horizontal and Vertical lines are 2 pixels when possible.
@ -2654,6 +2661,8 @@ b) Did I manually enter in those hex values?
`<<Forthcoming!>>`
### Fat Font: X
The next glyph that stands out is the `X`.
Change the `X` = $53 @ `6298`:
@ -2767,16 +2776,86 @@ We can either do this now, or fix the other glyphs and do this later.
Let's touch up the `2` and `Q` first.
### Fat Font: 2
We want to fix row 4 of the `2`:
6190:80 BF BF 8E 38 B3 BF 9E
Excellent!
![Screenshot ASCII Table Font BB 2b](pics/ascii_table_2b_fontbb.png?raw=true)
Excellent!
![Screenshot ASCII Table Font BB 2c](pics/ascii_table_2c_fontbb.png?raw=true)
### Fat Font: j
The serif/terminal on the `f` is one pixel while the serif/tail on the `j` is two pixels.
From:
```
6350:9E B3 B3 B0 B0 B0 80 B0
```
To:
```
6350:9E B3 B0 B0 B0 B0 80 B0
```
![Screenshot ASCII Table Font BB j2](pics/ascii_table_j2_fontbb.png?raw=true)
The dot / tittle on the `j` is inconsistent with the `i`. :-/ Another easy fix:
```
6350:9E B3 B0 B0 B0 80 B0 80
```
![Screenshot ASCII Table Font BB j3](pics/ascii_table_j3_fontbb.png?raw=true)
![Screenshot ASCII Table Font BB j4](pics/ascii_table_j4_fontbb.png?raw=true)
# What's next?
What's left? Quite a few things actually:
* Copy the 80-Column text screen to DHGR (Double High Resolution)
* Hook into the COUT so all text appears onto the HGR or DHGR screen
* Other 7x8 fonts
* Other non-7x8 fonts
# Conclusion
Hope this HGR font tutorial helped you understand the inner workings of a font blitter!
Happy (Apple ]\[ //e //c) Hacking!
Michael "AppleWin Debug Dev"
# Solutions
## Solution 1: ScrollHgrUpLine()
Figure it out ! You have all the tools and knowledge.
Seriously though, start with the data flow. Let's look at the HGR "text" lines we need to copy from/to:
Src Dst
1 0
2 1
3 2
4 3
5 4
6 5
7 6
8 7
# What's next?
What's left? Quite a few things actually: