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Jasmine Iwanek
2023-01-06 15:36:05 -05:00
parent 95cf08611c
commit a40630ba63
311 changed files with 6218 additions and 6062 deletions
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src/video/vid_pgc.c
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/*
* 86Box A hypervisor and IBM PC system emulator that specializes in
* running old operating systems and software designed for IBM
* PC systems and compatibles from 1981 through fairly recent
* system designs based on the PCI bus.
* 86Box A hypervisor and IBM PC system emulator that specializes in
* running old operating systems and software designed for IBM
* PC systems and compatibles from 1981 through fairly recent
* system designs based on the PCI bus.
*
* This file is part of the 86Box distribution.
* This file is part of the 86Box distribution.
*
* This implements just enough of the Professional Graphics
* Controller to act as a basis for the Vermont Microsystems
* IM-1024.
* This implements just enough of the Professional Graphics
* Controller to act as a basis for the Vermont Microsystems
* IM-1024.
*
* PGC features implemented include:
* > The CGA-compatible display modes
* > Switching to and from native mode
* > Communicating with the host PC
* PGC features implemented include:
* > The CGA-compatible display modes
* > Switching to and from native mode
* > Communicating with the host PC
*
* Numerous features are implemented partially or not at all,
* such as:
* > 2D drawing
* > 3D drawing
* > Command lists
* Some of these are marked TODO.
* Numerous features are implemented partially or not at all,
* such as:
* > 2D drawing
* > 3D drawing
* > Command lists
* Some of these are marked TODO.
*
* The PGC has two display modes: CGA (in which it appears in
* the normal CGA memory and I/O ranges) and native (in which
* all functions are accessed through reads and writes to 1K
* of memory at 0xC6000).
* The PGC has two display modes: CGA (in which it appears in
* the normal CGA memory and I/O ranges) and native (in which
* all functions are accessed through reads and writes to 1K
* of memory at 0xC6000).
*
* The PGC's 8088 processor monitors this buffer and executes
* instructions left there for it. We simulate this behavior
* with a separate thread.
* The PGC's 8088 processor monitors this buffer and executes
* instructions left there for it. We simulate this behavior
* with a separate thread.
*
* **NOTE** This driver is not finished yet:
* **NOTE** This driver is not finished yet:
*
* - cursor will blink at very high speed if used on a machine
* with clock greater than 4.77MHz. We should "scale down"
* this speed, to become relative to a 4.77MHz-based system.
* - cursor will blink at very high speed if used on a machine
* with clock greater than 4.77MHz. We should "scale down"
* this speed, to become relative to a 4.77MHz-based system.
*
* - pgc_plot() should be overloaded by clones if they support
* modes other than WRITE and INVERT, like the IM-1024.
* - pgc_plot() should be overloaded by clones if they support
* modes other than WRITE and INVERT, like the IM-1024.
*
* - test it with the Windows 1.x driver?
* - test it with the Windows 1.x driver?
*
* This is expected to be done shortly.
* This is expected to be done shortly.
*
*
*
* Authors: Fred N. van Kempen, <decwiz@yahoo.com>
* John Elliott, <jce@seasip.info>
* Authors: Fred N. van Kempen, <decwiz@yahoo.com>
* John Elliott, <jce@seasip.info>
*
* Copyright 2019 Fred N. van Kempen.
* Copyright 2019 John Elliott.
* Copyright 2019 Fred N. van Kempen.
* Copyright 2019 John Elliott.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by