32 lines
1.4 KiB
Markdown
32 lines
1.4 KiB
Markdown
---
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layout: page
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title: IBM PC (Model 5150, 64Kb) with Dual Displays
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permalink: /devices/pcx86/machine/5150/dual/64kb/
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machines:
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- id: ibm5150
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type: pcx86
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autoMount:
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A:
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name: PC-DOS 3.00 (Disk 1)
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---
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IBM PC (Model 5150, 64Kb) with Dual Displays
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The original IBM PC supported multiple display adapters. This page demonstrates a PCjs hardware configuration with
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both a Monochrome Display connected to an MDA (Monochrome Display Adapter) and a Color Display connected to a CGA
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(Color Display Adapter).
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At any given time, only one display was considered "active", and the initial active display was determined by switches
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on the motherboard. After booting DOS, you could use **MODE** commands to change the active display:
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- *mode co40* selects the Color Display and sets it to 40-column mode
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- *mode co80* selects the Color Display and sets it to 80-column mode
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- *mode mono* selects the Monochrome Display, which supports only 80-column mode
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The initial active display for the machine below is the Monochrome Display. Third-party software with dual-display
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support could write to both displays simultaneously, but most text-based applications only wrote to the active display.
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Programs that used color graphics, on the other hand, might use the Color Display whether or not it was currently
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active.
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{% include machine.html id="ibm5150" %}
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