Mainboard 81-184: Difference between revisions

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===74LS139 Mod===
===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].
If you find a 74LS139 in the front "SPARE" U70 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 22:00, 26 October 2026

The 81-184 boards are part of the "Universal" boards. They can be found in the 4X, New 2, ...

4X


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.


This is a New 2 board which does not have Drivetec drives and does not have U53 but does have U60.

Mods

74LS139 Mod

If you find a 74LS139 in the front "SPARE" U70 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.

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