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#Apple ]\[ HGR Font Tutorial #Apple ]\[ //e HGR Font 6502 Assembly Language Tutorial
Revision: 34, Jan 14, 2016. Revision: 35, Jan 14, 2016.
# Table of Contents # Table of Contents
@ -31,11 +31,13 @@ Revision: 34, Jan 14, 2016.
* Y Cursor Position * Y Cursor Position
* Natural Params SetCursorColRow() * Natural Params SetCursorColRow()
* DrawString() * DrawString()
* Recap
* Copy text screen to HGR * Copy text screen to HGR
* Exercise 1: ScrollHgrUpLine() * Exercises
* Exercise 2: ScrollHgrUpPixel() * Exercise 1: ScrollHgrUpLine()
* Exercise 2: ScrollHgrUpPixel()
* Recap
* Conclusion * Conclusion
* Solutions
* Solution 1: ScrollHgrUpLine() * Solution 1: ScrollHgrUpLine()
* Solution 2: ScrollHgrUpPixel() * Solution 2: ScrollHgrUpPixel()
* References * References
@ -1872,46 +1874,6 @@ Note: An easy way to get the hex bytes for a string is to use this tiny JavaScri
``` ```
# Recap
Here are all the routines we've entered in so far:
0301: 48 6A 6A 6A 6A 20 0A
0308:03 68 29 0F AA BD 90 03
0310:4C 3A 03 BD A0 03 85 F5
0318:BD B8 03 18 65 E6 85 F6
0320:60 86 F5 B9 A0 03 18 65
0328:F5 85 F5 B9 B8 03 18 65
0330:E6 85 F6 60 EA 48 20 13
0338:03 68 2A 2A 2A AA 29 F8
0340:8D 53 03 8A 29 03 2A 69
0348:60 8D 54 03 A6 F6 86 FD
0350:A2 00 BD 00 00 91 F5 18
0358:A5 F6 69 04 85 F6 E8 E0
0360:08 D0 EF C8 A6 FD 86 F6
0368:60
0390:30 31 32 33 34 35 36 37
0398:38 39 41 42 43 44 45 46
03A0:00 80 00 80 00 80 00 80
03A8:28 A8 28 A8 28 A8 28 A8
03B0:50 D0 50 D0 50 D0 50 D0
03B8:00 00 01 01 02 02 03 03
03C0:00 00 01 01 02 02 03 03
03C8:00 00 01 01 02 02 03 03
(To save this: `BSAVE CODE_0300.BIN,A$300,L$D0`)
What's left? Quite a few things actually:
* Copy the 40-Column text screen to HGR
* Scroll the HGR screen up by 1 pixel
* 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
Let's implement those first two.
## Copy text screen to HGR ## Copy text screen to HGR
For our final trick we are going to copy the characters off the text screen onto the HGR screen. More magic? Nah, just bit-shuffling. For our final trick we are going to copy the characters off the text screen onto the HGR screen. More magic? Nah, just bit-shuffling.
@ -2097,6 +2059,8 @@ And to restore the bottom 4 text rows
C053 C053
# Exercises
## Exercise 1: ScrollHgrUpPixel() ## Exercise 1: ScrollHgrUpPixel()
Hey! Homework? Yes, the only (true) way to demonstrate you understand the theory is with implementation: Hey! Homework? Yes, the only (true) way to demonstrate you understand the theory is with implementation:
@ -2125,21 +2089,60 @@ Hey! Homework? Yes, the only (true) way to demonstrate you understand the theo
very bottom scanline should be "blank." very bottom scanline should be "blank."
# Recap
Here are all the (core) routines we've entered in so far:
0301: 48 6A 6A 6A 6A 20 0A
0308:03 68 29 0F AA BD 90 03
0310:4C 3A 03 BD A0 03 85 F5
0318:BD B8 03 18 65 E6 85 F6
0320:60 86 F5 B9 A0 03 18 65
0328:F5 85 F5 B9 B8 03 18 65
0330:E6 85 F6 60 EA 48 20 13
0338:03 68 2A 2A 2A AA 29 F8
0340:8D 53 03 8A 29 03 2A 69
0348:60 8D 54 03 A6 F6 86 FD
0350:A2 00 BD 00 00 91 F5 18
0358:A5 F6 69 04 85 F6 E8 E0
0360:08 D0 EF C8 A6 FD 86 F6
0368:60
0390:30 31 32 33 34 35 36 37
0398:38 39 41 42 43 44 45 46
03A0:00 80 00 80 00 80 00 80
03A8:28 A8 28 A8 28 A8 28 A8
03B0:50 D0 50 D0 50 D0 50 D0
03B8:00 00 01 01 02 02 03 03
03C0:00 00 01 01 02 02 03 03
03C8:00 00 01 01 02 02 03 03
(To save this: `BSAVE CODE_0300.BIN,A$300,L$D0`)
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 ## Conclusion
Hope this HGR font tutorial helped you understand the inner workings of a font blitter! 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" Michael "AppleWin Debug Dev"
# Solutions
## Solution 1: ScrollHgrUpLine() ## Solution 1: ScrollHgrUpLine()
Figure it out ! You have all the tools and knowledge. Figure it out ! You have all the tools and knowledge.
## Solution 2: ScrollHgrUpPixel() ## Solution 2: ScrollHgrUpPixel()
There are many different ways to solve this depending if we want to prioritize space or speed. There are many different ways to solve this depending if we want to prioritize space or speed.