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Jasmine Iwanek
2022-11-13 16:37:58 -05:00
parent 702371a369
commit bd75bc141a
251 changed files with 2767 additions and 2703 deletions
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src/machine/m_ps1.c
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@@ -1,36 +1,36 @@
/*
* 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.
*
* Emulation of the IBM PS/1 models 2011, 2121.
* Emulation of the IBM PS/1 models 2011, 2121.
*
* Model 2011: The initial model, using a 10MHz 80286.
* Model 2011: The initial model, using a 10MHz 80286.
*
* Model 2121: This is similar to model 2011 but some of the functionality
* has moved to a chip at ports 0xe0 (index)/0xe1 (data). The
* only functions I have identified are enables for the first
* 512K and next 128K of RAM, in bits 0 of registers 0 and 1
* respectively.
* Model 2121: This is similar to model 2011 but some of the functionality
* has moved to a chip at ports 0xe0 (index)/0xe1 (data). The
* only functions I have identified are enables for the first
* 512K and next 128K of RAM, in bits 0 of registers 0 and 1
* respectively.
*
* Port 0x105 has bit 7 forced high. Without this 128K of
* memory will be missed by the BIOS on cold boots.
* Port 0x105 has bit 7 forced high. Without this 128K of
* memory will be missed by the BIOS on cold boots.
*
* The reserved 384K is remapped to the top of extended memory.
* If this is not done then you get an error on startup.
* The reserved 384K is remapped to the top of extended memory.
* If this is not done then you get an error on startup.
*
*
*
* Authors: Sarah Walker, <http://pcem-emulator.co.uk/>
* Miran Grca, <mgrca8@gmail.com>
* Fred N. van Kempen, <decwiz@yahoo.com>
* Authors: Sarah Walker, <http://pcem-emulator.co.uk/>
* Miran Grca, <mgrca8@gmail.com>
* Fred N. van Kempen, <decwiz@yahoo.com>
*
* Copyright 2008-2019 Sarah Walker.
* Copyright 2016-2019 Miran Grca.
* Copyright 2017-2019 Fred N. van Kempen.
* Copyright 2008-2019 Sarah Walker.
* Copyright 2016-2019 Miran Grca.
* Copyright 2017-2019 Fred N. van Kempen.
*/
#include <stdio.h>
#include <stdint.h>