Update docs and CI

.github/workflows/ti84-ref_app.yml

@@ -1,5 +1,5 @@
 ##############################################################################
-#  Copyright Christopher Kormanyos 2024.
+#  Copyright Christopher Kormanyos 2023 - 2024.
 #  Distributed under The Unlicense.
 
 name: ti84-ref_app
@@ -22,12 +22,12 @@ jobs:
         run: |
           mkdir ../sdcc-root
           cd ../sdcc-root
-          wget --no-check-certificate https://sourceforge.net/projects/sdcc/files/sdcc-linux-amd64/4.3.0/sdcc-4.3.0-amd64-unknown-linux2.5.tar.bz2
-          tar -xjf sdcc-4.3.0-amd64-unknown-linux2.5.tar.bz2
+          wget --no-check-certificate https://sourceforge.net/projects/sdcc/files/sdcc-linux-amd64/4.4.0/sdcc-4.4.0-amd64-unknown-linux2.5.tar.bz2
+          tar -xjf sdcc-4.4.0-amd64-unknown-linux2.5
       - name: build-and-verify-refapp
         run: |
           cd build
-          PATH=../../sdcc-root/sdcc-4.3.0/bin:"$PATH"
+          PATH=../../sdcc-root/sdcc-4.4.0/bin:"$PATH"
           sdcc -v
           make TYP_OS=UNIX all
           echo 'build-and-verify-refapp partial verify result'

readme.md

@@ -11,15 +11,16 @@ ti84-ref_app
 </p>
 
 `ckormanyos/ti84-ref_app` creates a fully functioning reference application
-for the z80-based TI-84 Plus monochrome graphics calculator. It runs in the
+for the TI-84 Plus monochrome graphics calculator. It runs in the
 open `Asm(prgm)` interface provided in the calculator's `CATALOG` menu.
-It uses the TI-84's on-board Z80 processor.
+It uses the TI-84's on-board [Z80 processor]((https://en.wikipedia.org/wiki/Zilog_Z80).
 
 The reference application implements parallel _blinky_ and _hello_-_world_ text-shows.
 A minimalistic cooperative multitasking scheduler controls
 the presentations of the associated ASCII-text messages.
 
-The text-shows _ON_/_OFF_ and _hello_/_world_ are written on the calculator screen.
+The text sequences _ON_/_OFF_ and _hello_/_world_ are presented in
+cyclic, alternating fasion(s) on the calculator screen.
 Text is used since there is no actual LED present on the calculator-target system.
 This is intended to simulate an LED-blinky by _toggling_ between _ON_ and _OFF_
 and support an independent _hello_-_world_-task as well.
@@ -128,7 +129,7 @@ from this.
 ### References
 
   - _TI_-_83_ _Plus_ _System_ _Routines_, Third Release (Jan. 25, 2002), located [here](https://education.ti.com/html/eguides/discontinued/computer-software/EN/SDK-TI-83-System-Routines_EN.pdf)
-  - _SDCC_ _Compiler_ _User_ _Guide_, SDCC 4.4.0, Revision 14549 (Dec. 20, 2023), located [here](https://sdcc.sourceforge.net/doc/sdccman.pdf)
+  - _SDCC_ _Compiler_ _User_ _Guide_, SDCC 4.4.1, Revision 14549 (at the time of writing this doc, Jan. 29, 2024), located [here](https://sdcc.sourceforge.net/doc/sdccman.pdf)
 
 ### Licensing