This commit is contained in:
Michaelangel007 2016-03-13 14:21:17 -07:00
commit bad0831dbc
8 changed files with 26 additions and 8 deletions

View File

@ -106,6 +106,9 @@ When you are at the Applesoft `]` prompt type in (or paste) the following:
FC58G
400:41
![Screenshot TEXT flash A](pics/text_flash_a.png?raw=true)
We used the ASCII character `A` which has a hex value 0x41. Hmm, OK, so we see an `A` but why is it flashing??
<hr>
@ -118,12 +121,24 @@ The 40x24 text screen of the Apple is _"memory-mapped"_ -- that is by directly s
400:01 41 C1
![Screenshot TEXT inverse A](pics/text_inverse_a.png?raw=true)
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.
<hr>
A slight fun diversion: If you are on an enhanced Apple //e or //c we can activate a 2nd character set called `Mouse Text`. This replaces all the flashing text with special drawing charactes:
A slight fun diversion: If you are on an enhanced Apple //e or //c we can activate a 2nd character set called `Mouse Text`. This replaces all the flashing text with special drawing characters that help make a text based UI.
This is what the full 32 Mouse Text glyphs look like:
![Screenshot ASCII Font 7x8](pics/ascii_table_1_font7x8.png?raw=true)
Anyways, enter in:
```
C00F:1
```
![Screenshot TEXT mousetext A](pics/text_mousetext_a.png?raw=true)
You should see the flashing `A` has been replaced with an open apple symbol.
@ -140,6 +155,8 @@ If we switch to the HGR screen and tried to enter in 0x41 what would happen? (Ig
F3E2G ; `HGR`
2000:41 ; A
![Screenshot 0](pics/hgrfont_00.png?raw=true)
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.)
# A Solution:
@ -2594,7 +2611,7 @@ Let's display our new glyphs at row 12.
![Screenshot ASCII Table Font BB S2](pics/ascii_table_s2_fontbb.png?raw=true)
While that matches the style of `5` / `6` it doesn't match the round style of `A` / `B`.
While that matches the style of `5` it doesn't match the style of `A`.
Let's fix the top and bottom rows.
```
@ -2901,14 +2918,15 @@ The round corners of `A` are **sans serif**. Let's make the `M` consistent:
While the `7` is not bad, we could do a very minor touchup.
# What's Next?
# What's next?
What's left to do? Quite a few things actually:
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
* Copy the 80-Column text screen to the DHGR (Double High Resolution Graphics) screen,
* Hook into the COUT so all text appears onto the HGR or DHGR screen automatically,
* non-grid aligned (proportional) 7x8 fonts (potentially 8 font tables),
* non 7x8 fonts, such as 4x6.
# Conclusion

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