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April 22, 2023


Everything about MSX, and more…

Inverting the Slots of the Brazilian MSX Plus & DD-Plus

2 min read
In Brazil, a company called Gradient released a few cloned versions of the MSX. The first version was a gray version called Expert, and it had two releases: 1.0 and 1.1. However, when it was the time to release the MSX 2.0, for some reason Gradient stepped back with its plans and released the MSX Plus and DD-Plus as MSX 1 version with only few enhancements, being the DD-Plus a release with a 3 1/2 drive embedded in the cabinet.
Inverting the Slots of the Brazilian MSX Plus & DD-Plus

This very simple modification makes the switch of the Slot 3.3 with the Slot 2:

The same change applies to the Gradiente MSX Plus & MSX DD-Plus plus, and such change can be very useful for the following scenarios:

  • For the MSX Plus it is useful when you have kitplus installed.
  • On the MSX DD-Plus it allows the internal drive interface to boot up before any external interface.

This inversion cause no issues or change any other behavior in the computers.

To proceed and apply the modification simply remove the wired-jumpers labeled as 25J108 and 25J109 and invert them (as demonstrated in the picture above).

Important: as you will have to cross the wires it is strongly recommended to use covered/protected wires, or make sure you isolate them to prevent short-circuit accidents.

That’s it. Your job is done!

The Brazilian MSX Plus and DD-Plus by Gradient.

Original written by B@SS MSX and published in his blog at