I downloaded a bunch of ADB tools yesterday and cracked (partially)
MicroSpeed 3-button mouse protocol. It is as follows:

Setup:
  The handler_id field for this mouse is 47. I took it as a
"signature" and use this number to distinguish that type of a mouse.
First send "listen 1" command with the data:
buffer[1] -- not significant (?), i put 0x3 there
buffer[2] -- speed, 00 is the default(?), 01 if the min
buffer[3] -- 0x10 , magic flag to enable extended protocol
buffer[4] -- first 4 bits = lock flags, if 1 the mouse sends the
             button-down signal on the first click, button-up on the
             second
             last 4 bits = button enable bits. if 1, the button works.

After that the mouse return data in the form:

buffer[0]  = 4 (bytes)
buffer[1], buffer[2] = as the standard mouse
buffer[3]==buffer[4] = 0xFF when no buttons are down. When the button
                       N is down, bit N is cleared.

So, here is the patch to implement this protocol. There are no changes
to ADB code, only some additions with comparasion devType==47.
I checked that this patch works for X.

	Taras Ivanenko.


*** /usr/users/ivanenko/work/arch/mac68k/dev/adb.c	Tue Apr 30 10:03:46 1996
--- arch/mac68k/dev/adb.c	Tue Apr 30 09:44:29 1996
***************
*** 312,317 ****
--- 312,318 ----
  		 */
  		max_byte = event->byte_count;
  		button_bit = 1;
+ 		if(event->hand_id != 47) {
  		  /* Classic Mouse Protocol (up to 2 buttons) */
  		  for (i = 0; i < 2; i++, button_bit <<= 1)
  		    /* 0 when button down */
***************
*** 329,334 ****
--- 330,343 ----
  		      buttons &= ~button_bit;
  		    mask = ((mask >> 4) & 0xf) | ((mask & 0xf) << 4);
  		  }
+ 		} else { 
+ 		  /* MicroSpeed mouse */
+ 		  if(max_byte==4) {
+ 		    buttons = (~event->bytes[2])&0xFF;
+ 		  } else {
+ 		    buttons = (event->bytes[0]&0x80)?0:1;
+ 		  }
+ 		}
  		  new_event.u.m.buttons = adb_ms_buttons | buttons;
  		  new_event.u.m.dx = ((signed int) (event->bytes[1] & 0x3f)) -
  					((event->bytes[1] & 0x40) ? 64 : 0);
*** /usr/users/ivanenko/work/arch/mac68k/dev/adbsys.c	Tue Apr 30 10:03:57 1996
--- arch/mac68k/dev/adbsys.c	Mon Apr 29 23:13:33 1996
***************
*** 107,112 ****
--- 113,139 ----
  	for (adbindex = 1; adbindex <= totaladbs; adbindex++) {
  		/* Get the ADB information */
  		adbaddr = GetIndADB(&adbdata, adbindex);
+ #if defined(MICROSPEED_MOUSE) || 1
+ 		if (adbdata.origADBAddr == ADBADDR_MS &&
+ 		    (adbdata.devType == 47)) {
+ 		  /* found MicroSpeed Mouse Deluxe Mac */
+ 		  cmd = 0x39; /* listen 1 */
+ 
+ 		  buffer[0]=4;
+ 		  buffer[1]=0x03; /* ??? */
+ 		  buffer[2]=0x00; /* speed = maximum */
+ 		  buffer[3]=0x10; /* enable extended protocol */
+ 		  buffer[4]=0x07; /* Locking mask = 0000b, 
+ 				     enable buttons = 0111b */
+ 
+ 		  extdms_done = 0;
+ 		  ADBOp((Ptr)buffer, (Ptr)extdms_complete,
+ 			(Ptr)&extdms_done, cmd);
+ 		  while (!extdms_done)
+ 		    /* busy wait until done */;
+ 
+ 		}
+ #endif
  		if (adbdata.origADBAddr == ADBADDR_MS &&
  		    (adbdata.devType == 1 || adbdata.devType == 2)) {
  			/* found a mouse */
***************
*** 213,218 ****
--- 241,249 ----
  			case 2:
  				printf("200 dpi mouse");
  				break;
+                         case 47: 
+ 				printf("MicroSpeed mouse, default parameters");
+ 				break;
  			case 4:
  				extdms_done = 0;
  				/* talk register 1 */