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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: 68, Jan 28, 2016.
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Revision: 67, Jan 28, 2016.
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# Table of Contents
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@ -106,6 +106,9 @@ When you are at the Applesoft `]` prompt type in (or paste) the following:
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FC58G
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400:41
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![Screenshot TEXT flash A](pics/text_flash_a.png?raw=true)
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We used the ASCII character `A` which has a hex value 0x41. Hmm, OK, so we see an `A` but why is it flashing??
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<hr>
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@ -118,6 +121,8 @@ The 40x24 text screen of the Apple is _"memory-mapped"_ -- that is by directly s
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400:01 41 C1
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![Screenshot TEXT inverse A](pics/text_inverse_a.png?raw=true)
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The control characters show up in `inverse`, ASCII characters show up `flashing`, and our normal character requires the high bit to be set. 0x41 + 080 = 0xC1.
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<hr>
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@ -125,6 +130,8 @@ A slight fun diversion: If you are on an enhanced Apple //e or //c we can activa
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C00F:1
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![Screenshot TEXT mousetext A](pics/text_mousetext_a.png?raw=true)
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You should see the flashing `A` has been replaced with an open apple symbol.
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To turn `Mouse Text` off:
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@ -140,6 +147,8 @@ If we switch to the HGR screen and tried to enter in 0x41 what would happen? (Ig
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F3E2G ; `HGR`
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2000:41 ; A
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![Screenshot 0](pics_hgrfont_00.png?raw=true)
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Hmm, that doesn't look like an `A` at all, only gibberish -- 2 dots. :-/ (If you see 2 magenta dots ignore the color for now.)
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# A Solution:
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@ -2594,7 +2603,7 @@ Let's display our new glyphs at row 12.
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![Screenshot ASCII Table Font BB S2](pics/ascii_table_s2_fontbb.png?raw=true)
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While that matches the style of `5` / `6` it doesn't match the round style of `A` / `B`.
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While that matches the style of `5` it doesn't match the style of `A`.
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Let's fix the top and bottom rows.
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```
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@ -2901,14 +2910,15 @@ The round corners of `A` are **sans serif**. Let's make the `M` consistent:
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While the `7` is not bad, we could do a very minor touchup.
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# What's Next?
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# What's next?
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What's left to do? Quite a few things actually:
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What's left? Quite a few things actually:
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* Copy the 80-Column text screen to DHGR (Double High Resolution)
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* Hook into the COUT so all text appears onto the HGR or DHGR screen
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* Other 7x8 fonts
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* Other non-7x8 fonts
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* Copy the 80-Column text screen to the DHGR (Double High Resolution Graphics) screen,
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* Hook into the COUT so all text appears onto the HGR or DHGR screen automatically,
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* non-grid aligned (proportional) 7x8 fonts (potentially 8 font tables),
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* non 7x8 fonts, such as 4x6.
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# Conclusion
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pics/hgrfont_00.png
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pics/hgrfont_00.png
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After Width: | Height: | Size: 11 KiB |
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pics/text_flash_a.png
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pics/text_flash_a.png
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After Width: | Height: | Size: 11 KiB |
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pics/text_inverse_a.png
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pics/text_inverse_a.png
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After Width: | Height: | Size: 11 KiB |
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pics/text_mousetext_a.png
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pics/text_mousetext_a.png
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After Width: | Height: | Size: 11 KiB |
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