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Added CGA information

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This commit is contained in:
Jeff Parsons 2016-03-21 15:50:39 -07:00
commit 496f9ce31a
5 changed files with 133 additions and 12 deletions
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3
devices/pc/video/README.md
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@ -13,12 +13,13 @@ configuration file. See one of the following video adapters for examples of ho
PCjs supports the following IBM PC video adapters:
* Monochrome Display Adapter (MDA)
* Color Graphics Adapter (CGA)
* [Color Graphics Adapter (CGA)](ibm/cga/)
* [Enhanced Graphics Adapter (EGA)](ibm/ega/)
* [Video Graphics Array (VGA)](ibm/vga/)
More detailed information is available for the following IBM-compatible video adapters:
* [CDP CGA](/devices/pc/video/cdp/cga/)
* [ATI VGA](/devices/pc/video/ati/vga/)
* [COMPAQ EGA](/devices/pc/video/compaq/ega/)
* [COMPAQ VGA](/devices/pc/video/compaq/vga/)

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devices/pc/video/cdp/cga/README.md Normal file
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---
layout: page
title: "Columbia Data Products Color Graphics Adapter (CGA)"
permalink: /devices/pc/video/cdp/cga/
---
Columbia Data Products Color Graphics Adapter (CGA)
---
We don't have a Columbia Data Products CGA card, so we cannot say to what extent it may differ from
an IBM CGA card (if at all). All we have is what's believed to be a copy of their CGA character ROM,
and it is *identical* the CGA portion of the [IBM CGA](/devices/pc/video/ibm/cga/) character ROM.
### Columbia Data Products CGA Configurations
The easiest way for a machine to include an CGA *[Video](/docs/pcjs/video/)* component in its XML configuration file
is to reference the project's predefined CGA configuration file, using the *ref* attribute; eg:
<video ref="/devices/pc/video/cdp/cga/cdp-cga.xml"/>
The referenced XML file automatically defines visual elements (eg, dimensions of the display window and other
visual indicators), display behaviors (eg, touchscreen support, mouse pointer locking), and the character ROM to load.
Here's what *cdp-cga.xml* currently looks like:
<video id="videoCGA" model="cga" screenwidth="960" screenheight="480" scale="true" charset="/devices/pc/video/cdp/cga/MPC_VID-1.0.json" pos="center" padding="8px">
<menu>
<title>Color Display</title>
<control type="container" pos="right">
<control type="led" label="Caps" binding="caps-lock" padleft="8px"/>
<control type="led" label="Num" binding="num-lock" padleft="8px"/>
<control type="led" label="Scroll" binding="scroll-lock" padleft="8px"/>
</control>
</menu>
</video>
### Columbia Data Products CGA Character ROM
There is only one known Columbia Data Products CGA Character ROM ([MDP_VID-10.json](MDP_VID-1.0.json)), and it is
*identical* to the CGA portion of the [IBM CGA](/devices/pc/video/ibm/cga/) character ROM.
For reference, here are the first 0x80 bytes at offset 0x0000 from this ROM, which contain the font data for the first
16 8x8 characters:
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x7E,0x81,0xA5,0x81,0xBD,0x99,0x81,0x7E, // 0x00000000 ........~......~
0x7E,0xFF,0xDB,0xFF,0xC3,0xE7,0xFF,0x7E,0x6C,0xFE,0xFE,0xFE,0x7C,0x38,0x10,0x00, // 0x00000010 ~......~l...|8..
0x10,0x38,0x7C,0xFE,0x7C,0x38,0x10,0x00,0x38,0x7C,0x38,0xFE,0xFE,0xD6,0x10,0x38, // 0x00000020 .8|.|8..8|8....8
0x10,0x10,0x38,0x7C,0xFE,0x7C,0x10,0x38,0x00,0x00,0x18,0x3C,0x3C,0x18,0x00,0x00, // 0x00000030 ..8|.|.8........
0xFF,0xFF,0xE7,0xC3,0xC3,0xE7,0xFF,0xFF,0x00,0x3C,0x66,0x42,0x42,0x66,0x3C,0x00, // 0x00000040 ..........fBBf..
0xFF,0xC3,0x99,0xBD,0xBD,0x99,0xC3,0xFF,0x0F,0x07,0x0F,0x7D,0xCC,0xCC,0xCC,0x78, // 0x00000050 ...........}...x
0x3C,0x66,0x66,0x66,0x3C,0x18,0x7E,0x18,0x3F,0x33,0x3F,0x30,0x30,0x70,0xF0,0xE0, // 0x00000060 .fff..~.?3?00p..
0x7F,0x63,0x7F,0x63,0x63,0x67,0xE6,0xC0,0x18,0xDB,0x3C,0xE7,0xE7,0x3C,0xDB,0x18, // 0x00000070 .c.ccg..........

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devices/pc/video/cdp/cga/cdp-cga.xml
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<?xml version="1.0" encoding="UTF-8"?>
<video id="videoCGA" model="cga" screenwidth="960" screenheight="480" scale="true" charset="/devices/pc/video/cdp/cga/MPC_VID-1.0.json" pos="center" padding="8px">
<menu>
<title>Columbia Data Products Color Display</title>
<title>Color Display</title>
<control type="container" pos="right">
<control type="led" label="Caps" binding="caps-lock" padleft="8px"/>
<control type="led" label="Num" binding="num-lock" padleft="8px"/>

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---
layout: page
title: "IBM Color Graphics Adapter (CGA)"
permalink: /devices/pc/video/ibm/cga/
---
IBM Color Graphics Adapter (CGA)
---
### IBM CGA Configurations
The easiest way for a machine to include an CGA *[Video](/docs/pcjs/video/)* component in its XML configuration file
is to reference one of the project's predefined CGA configuration files, using the *ref* attribute; eg:
<video ref="/devices/pc/video/ibm/cga/ibm-cga.xml"/>
The referenced XML file automatically defines visual elements (eg, dimensions of the display window and other
visual indicators), display behaviors (eg, touchscreen support, mouse pointer locking), and the character ROM to load.
Here's what *ibm-cga.xml* currently looks like:
<video id="videoCGA" screenwidth="960" screenheight="480" scale="true" charset="/devices/pc/video/ibm/cga/ibm-cga.json" pos="center" padding="8px">
<menu>
<title>Color Display</title>
<control type="container" pos="right">
<control type="led" label="Caps" binding="caps-lock" padleft="8px"/>
<control type="led" label="Num" binding="num-lock" padleft="8px"/>
<control type="led" label="Scroll" binding="scroll-lock" padleft="8px"/>
</control>
</menu>
</video>
The following IBM CGA configuration files are currently available:
- [ibm-cga.xml](ibm-cga.xml)
- [ibm-cga-dual.xml](ibm-cga-dual.xml)
- [ibm-cga-keygrid.xml](ibm-cga-keygrid.xml)
- [ibm-cga-lock.xml](ibm-cga-lock.xml)
### IBM CGA Character ROM
There is only one known CGA Character ROM ([ibm-cga.json](ibm-cga.json)), and it is identical to the MDA Character ROM,
because the ROM contains both the 8x14 MDA and 8x8 CGA fonts.
As documented in [Video.doneLoad()](/modules/pcjs/lib/video.js):
[T]here are TWO CGA fonts in the ROM: a thin 5x7 "single dot" font located at offset 0x1000, and a thick 7x7
"double dot" font at offset 0x1800. The latter is the default font, unless overridden by a jumper setting on
the CGA card, so it is our default CGA font as well (although someday we may provide a virtual jumper setting
that allows you to select the thinner font).
For reference, here are the first 0x80 bytes at offset 0x1800 from this ROM, which contain the font data for the first
16 8x8 characters:
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x7E,0x81,0xA5,0x81,0xBD,0x99,0x81,0x7E, // 0x00001800 ........~......~
0x7E,0xFF,0xDB,0xFF,0xC3,0xE7,0xFF,0x7E,0x6C,0xFE,0xFE,0xFE,0x7C,0x38,0x10,0x00, // 0x00001810 ~......~l...|8..
0x10,0x38,0x7C,0xFE,0x7C,0x38,0x10,0x00,0x38,0x7C,0x38,0xFE,0xFE,0xD6,0x10,0x38, // 0x00001820 .8|.|8..8|8....8
0x10,0x10,0x38,0x7C,0xFE,0x7C,0x10,0x38,0x00,0x00,0x18,0x3C,0x3C,0x18,0x00,0x00, // 0x00001830 ..8|.|.8........
0xFF,0xFF,0xE7,0xC3,0xC3,0xE7,0xFF,0xFF,0x00,0x3C,0x66,0x42,0x42,0x66,0x3C,0x00, // 0x00001840 ..........fBBf..
0xFF,0xC3,0x99,0xBD,0xBD,0x99,0xC3,0xFF,0x0F,0x07,0x0F,0x7D,0xCC,0xCC,0xCC,0x78, // 0x00001850 ...........}...x
0x3C,0x66,0x66,0x66,0x3C,0x18,0x7E,0x18,0x3F,0x33,0x3F,0x30,0x30,0x70,0xF0,0xE0, // 0x00001860 .fff..~.?3?00p..
0x7F,0x63,0x7F,0x63,0x63,0x67,0xE6,0xC0,0x18,0xDB,0x3C,0xE7,0xE7,0x3C,0xDB,0x18, // 0x00001870 .c.ccg..........