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Merge pull request #967 from rhalkyard/feature/plus4-tgi-driver

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TGI driver and IRQ-handler fix for plus4
This commit is contained in:
Bob Andrews
2025-06-17 20:49:09 +02:00
committed by GitHub
parent f04c25a233 0b0bead634
commit 3486cd7830
13 changed files with 1112 additions and 63 deletions
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doc/plus4.sgml
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@@ -165,8 +165,26 @@ The names in the parentheses denote the symbols to be used for static linking of
<sect1>Graphics drivers<p>
No graphics drivers are currently available for the Plus/4.
<descrip>
<tag><tt/ted-hi.tgi (ted_hi_tgi)/</tag>
This driver features a resolution of 320*200 with two colors and an
adjustable palette (that means that the two colors can be chosen out of a
palette of the 121 TED colors).
Note that the text-mode character matrix and color data are destroyed by this
driver. The driver calls the Kernal <tt/CLRSCR/ routine to return the text
screen to a usable (if empty) state on <tt/tgi_done()/.
This driver places the bitmap at &dollar;C000-&dollar;E000. Programs using
this driver must either be linked with the option <tt/-D
__HIMEM__=&dollar;C000/, or use the <tt/plus4-hires.cfg/ linker configuration.
The <tt/plus4-hires.cfg/ is preferable, as it allows the stack to remain at
&dollar;FCFF, and exposes the remaining high memory from the end of the bitmap
to the stack top as a <tt/HIBSS/ segment that can be used by the programmer,
or given to <tt/_heapadd()/ (using the symbols <tt/_HIBSS_START__/ and
<tt/_HIBSS_SIZE__/).
</descrip><p>
<sect1>Extended memory drivers<p>