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IBM 5550: Add a machine config for RNA test mode#6844

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OBattler merged 2 commits into
86Box:masterfrom
akmed772:master
Feb 26, 2026
Merged

IBM 5550: Add a machine config for RNA test mode#6844
OBattler merged 2 commits into
86Box:masterfrom
akmed772:master

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Summary

  • Added a machine configuration for the RNA (Resident Non-Automatic Diagnostics) test mode.
  • Merged the display adapter configuration into the machine configuration.
  • Changed the keyboard reset sequence to work on the RNA test correctly.
  • Reduced screen updates when the text cursor moved.

It won't pass the diskette test because of incomplete FDC emulation.

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Monitor_1_20260224_2 Monitor_1_20260224

* Added a machine config for the RNA test mode.
* Changed the keyboard reset sequence to work on the RNA test correctly.
* Reduced screen updates for text cursor.
Remove unnecessary kbc interrupt repeatedly
@OBattler OBattler merged commit ff3c905 into 86Box:master Feb 26, 2026
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2 participants