Mainboard 81-184: Difference between revisions
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FrankRahman (talk | contribs) (Created page with "The 81-184 boards are part of the "Universal" boards. They can be found in the 4X, New 2, ... ==4X== {| |- | File:81-184 A1 K4X.jpg || File:81-184 A1 K4X bottom.jpg |- | File:81-184 A1 closeup U45 4X.jpg<br>This is a closeup of the 4X board. Note that U53 is populated and that U60 has resistors replacing it. This is required for the Drivetec Drives. || File:81-184 A1 Closeup U45 No Clock.jpg<br>This is a New 2 board which does not have Drivetec d...") |
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[[File:81-184 A1 Closeup U45 No Clock.jpg]]<br>This is a New 2 board which does not have Drivetec drives and does not have U53 but does have U60. | [[File:81-184 A1 Closeup U45 No Clock.jpg]]<br>This is a New 2 board which does not have Drivetec drives and does not have U53 but does have U60. | ||
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==Mods== | |||
===74LS139 Mod=== | |||
If you find a 74LS139 in the front "SPARE" socket you may have a Mod to allow for more than two drives. See page 93 of Micro Cornucopia Apr-May 1986 for details. Link [https://bitsavers.org/magazines/Micro%20Cornucopia/Micro%20Cornucopia%2029%20Apr86.pdf here]. | |||
Revision as of 21:58, 26 October 2026
The 81-184 boards are part of the "Universal" boards. They can be found in the 4X, New 2, ...
4X
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Mods
74LS139 Mod
If you find a 74LS139 in the front "SPARE" socket you may have a Mod to allow for more than two drives. See page 93 of Micro Cornucopia Apr-May 1986 for details. Link here.