IBM System/23 Datamaster: Difference between revisions
Content deleted Content added
Line 183:
| 2Fh || 8255#1 || 8255#1 control port
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| 40h || 8255#2 ||
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| 41h || 8255#2 || Service port
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| 42h || 8255#2 ||
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| 43h || 8255#2 || 8255#2 control port
Line 197:
| 4Ch || 8255#3 || Data bus test register
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| 4Dh-4Eh || 8255#3 ||
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| 4Fh || 8255#3 || 8255#3 control port
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