Apple Desktop Bus Mouse Parts

A9M0331 & G5431 Parts

Introduced with the Apple IIGS in 1986, it didn’t have a name printed on the label, simply Model No A9M0331.

The Macintosh got the same mouse later - introduced with the Macintosh II and the SE. The label not only sported a name, Apple Desktop Bus Mouse, but was given a Family Number G5431.

Both numbers were used for the duration of this wedge shaped mouse, and there are several versions of them over the next 6 years.

If the mouse ball is black and there are two diagonal notches or cutouts on the bottom for the mouse retainer, all parts seem to be interchangeable between 1 and 2 below for the purpose of this website. The teflon strips are notorious for coming unglued on these versions, so priority is given to complete working mice, I cannot guarantee that the bottom case or retainer ring will have these strips:

1) A9M0331 (black ball). The mouse was made by Logitech in Taiwan. The controller board is beige colored on the top and green underneath. Printed on the underside of the board is “A D B Mouse by Logitech” and the particular one I am looking at says Rev C2. The interior ball cage is white. The mouse base is stamped 400116. The mouse top is stamped 400115. The button part of the top is stamped 400117. The retainer ring is stamped 400118.

2) G5431 (black ball). The mouse was made by Logitech in Taiwan. The controller board is green. Printed on the board is “Logitech AT Rev B”, P/N 200048-00. The interior ball cage is black. The mouse base is stamped 400116. The mouse top is stamped 400115. The button part of the top is stamped 400234. The retainer ring is stamped 400235.

3) G5431 (gray ball). This mouse was made by Alps in the U.S.A. The controller board is brown. Stamped Alps 820-0232. The gray mouse ball is 1” (25mm). The ball ball retainer is round with a V at the bottom indicating pull it down to remove it. There is no separate ball cage, it is part of the case. The mouse base is stamped 815-1090. The mouse top is stamped 815-1092. The button part of the top is stamped 815-1091. The retainer ring does not have a number. The lower teflon is not on the ring, but on the base. Upon removal of the board assy, one roller and spring may fall out. Two little white plastic supports for the other rollers may fall off.

The following two look identical from the outside, but the ball and ribbed retainer are the only parts interchangeable:

4) A9M0331 (gray ball). The mouse was made in the USA. The controller board is green. Unknown manufacturer, but board stamped 820-0146. The gray mouse ball is 1” (25mm). The mouse ball retainer (gray or black) is round and ribbed with 3 tabs that mate to the bottom of the case. The ball cage is white. The controller board is screwed to the bottom of the case with 3 screws.The mouse base is stamped 815-0733. The mouse top is stamped 815-0732. The button part of the top is stamped 815-0852. The retainer ring may be unstamped. Two or all three of the rollers are steel.

5) G5431 (gray ball). The mouse was made by Mitsumi in Malaysia. The controller board is brown. Stamped Mitsumi. The gray mouse ball is 1” (25mm). The mouse ball retainer (gray) is round and ribbed with 3 tabs that mate to the bottom of the case. The ball cage is black. The controller board is screwed to the bottom of the case with 2 screws.The mouse base is stamped 64-1259. The mouse top is stamped 64-1260. The button part of the top is stamped 64-1261. The retainer ring may be unstamped or marked 64-1262.

Parts Available:

Mouse ball retainer, complete (with teflon strip if it is supposed to have it)
Mouse ball retainer, missing teflon strip
Mouse ball, black 7/8” (21.8mm)
Mouse ball, gray 1”(25mm)
Screws, case (set of 4)
Mouse bottom case (may or may not have teflon strip(s))
Mouse top case with attached “button”
Board assy w/cable
Board screws (set of 2 or 3)
Teflon strip, front
Teflon strip, mouse retainer *on mouse #3, this strip is on the bottom of the case.

Regarding the controller boards: They are for parts or repair only. The mice used for parts do not work at all, have a smashed cable end, the cursor is very jumpy, or the click is funky - it doesn’t stay held down, or come up, or a single click is two, etc.

Product Options
Combination of product variants is not available
Product in stock

Price: from $0.50

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