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Add IBM PC variant and memory expansion notes

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RichardG867
2024-09-04 19:21:29 -03:00
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hardware/machinespecific.rst
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@@ -8,18 +8,48 @@ This page contains important notes related to specific machine models emulated b
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.. rubric:: IBM PC
* The 1981 and 1982 variants correspond to the `earlier 16KB-64KB and later 64KB-256KB revisions of the motherboard <https://www.minuszerodegrees.net/5150/motherboard/5150_motherboard_revisions.htm>`_, with different BIOS versions and memory size limits.
* Those limits apply to on-board RAM; more can be added through :ref:`ISA memory expansion <settings/peripherals:ISA Memory Expansion>` cards.
.. rubric:: IBM PCjr
* Some applications may shift the display slightly to one side due to unconventional use of the PCjr video hardware. Unchecking the **Apply overscan deltas** option accessible through the internal video's :ref:`Configure button <settings/display:Video>` can help bring the display back into position.
* Hard disks are not supported, as a PCjr-compatible hard disk controller is not emulated by 86Box.
.. rubric:: IBM XT
* The 1982 and 1986 variants correspond to the `earlier 64-256KB and later 256-640KB revisions of the motherboard <https://www.minuszerodegrees.net/5160/motherboard/5160_motherboard_revisions.htm>`_, with different BIOS versions and memory size limits.
* Those limits apply to on-board RAM; more can be added through :ref:`ISA memory expansion <settings/peripherals:ISA Memory Expansion>` cards.
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.. _ibmat:
.. rubric:: IBM AT
* On-board RAM is limited to 512 KB; more can be added through :ref:`ISA memory expansion <settings/peripherals:ISA Memory Expansion>` cards.
* The IBM Personal Computer Diagnostics disks are not Y2K-compliant and will produce a *0152 ERROR - SYSTEM BOARD* code if :ref:`time synchronization <settings/machine:Time synchronization>` is enabled. This code can be cleared by disabling time synchronization, then clearing the CMOS by deleting ``ibmat.nvr`` from the machine's ``nvr`` directory.
.. rubric:: IBM XT Model 286
* On-board RAM is limited to 640 KB; more can be added through :ref:`ISA memory expansion <settings/peripherals:ISA Memory Expansion>` cards.
.. rubric:: AMI IBM AT
See: :ref:`ibmat`
.. rubric:: Phoenix IBM AT
See: :ref:`ibmat`
.. rubric:: Quadtel IBM AT
See: :ref:`ibmat`
i486
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