PowerMac 6100 HDI-45 to VGA

I've got my 6100 working with my SVGA monitor by bypassing the HDI-45 connector to a standard VGA female connector.

VGA female looking at back (solder tags)

1 2 3 4 5
6 7 8 9 10
11 12 13 14 15

---------------------------------

L3 L4 L6 L7 L8 L9 R7 R8 R9
are on the 6100 logic board just behind the HDI-45 plug.

There are two solder points for L3 L4 etc.

Solder to the point (of L3 L4 etc) that is closest
to the back of the Logic board (ie closest to the HDI-45 plug)
not the other solder point that is closest
to the front of the logic board.

L7 to vga 3
L8 to vga 1
L9 to vga 2

R8 and R9 joined together
(can be a diode between R8 and R9 but this
doesn't apply for a old PC SVGA monitor)

R7 to L3 then to vga (6 7 8 9 10) (vga 6 7 8 9 10 are all joined together)

L6 to vga 13
L4 to vga 14

I've got my VGA connector mounted above the adb, printer etc connectors.

Not really 68k but I hav'nt seen this info around so I thought it would be useful.

I left out in the earlier post that vga 11 should be connected to vga 6 7 8 9 10.

L9 L8 L7 R9 R8 R7 L6 R6 R5 L5 L4

|---------------------------------|
| |
| |
| HDI-45 | L3
| |
| |

BACK OF LOGIC BOARD

VGA FEMALE SOLDER TAG SIDE

1 2 3 4 5
6 7 8 9 10
11 12 13 14 15

---------------------------------

L3 L4 L6 L7 L8 L9 R7 R8 R9
are on the 6100 logic board just behind the HDI-45 plug.

There are two solder points for L3 L4 etc.

Solder to the point (of L3 L4 etc) that is closest
to the back of the Logic board (ie closest to the HDI-45 plug)
not the other solder point that is closest
to the front of the logic board.

L7 to vga 3
L8 to vga 1
L9 to vga 2

R8 and R9 joined together for vga svga mode

(can be a diode between R8 and R9
for 17"-21" VGA multiscan monitor

DIODE R9 --- <-- R8
(might have to reverse diode if monitor only supports upto 1024 x 768)

Might have to try the diode both ways.

R7 to L3 then to vga (6 7 8 9 10 11) (vga 6 7 8 9 10 11 are all joined together)

L6 to vga 13
L4 to vga 14

My visually stunning diagram got messed up.

Just align the L3 line to the right side of the HDI-45 connector.

quote:

---

I left out in the earlier post that vga 11 should be connected to vga 6 7 8 9 10.

  L9 L8 L7       R9 R8 R7 L6 R6 R5 L5 L4   
  
   |---------------------------------|
   |                                 |
   |                                 |
   |           HDI-45                |    L3
   |                                 |
   |                                 |
         BACK OF LOGIC BOARD
      VGA FEMALE SOLDER TAG SIDE
      1    2    3    4    5
        6   7   8   9   10
         11 12 13 14 15
    ---------------------------------

L3 L4 L6 L7 L8 L9 R7 R8 R9
are on the 6100 logic board just behind the HDI-45 plug.

There are two solder points for L3 L4 etc.
Solder to the point (of L3 L4 etc) that is closest 
to the back of the Logic board (ie closest to the HDI-45 plug)
not the other solder point that is closest 
to the front of the logic board.

L7 to vga 3
L8 to vga 1
L9 to vga 2
R8 and R9 joined together for vga svga mode

(can be a diode between R8 and R9 
for 17"-21" VGA multiscan monitor 
 DIODE  R9  --- <--   R8
(might have to reverse diode if monitor only supports upto 1024 x 768)
    
Might have to try the diode both ways.
R7 to L3 then to vga (6 7 8 9 10 11) (vga 6 7 8 9 10 11 are all joined together)

L6 to vga 13
L4 to vga 14 

---

jt ™.
Trash Hauler: call sign: eight-ball
C.O. AC-130H SpecOps 68kMLAAF

Thanks.

That's the way it should be.

6100 available Dram Video modes

640x480 @ 60 Hz (VGA)

640x480 @ 67 Hz (Mac) but also works on my PC SVGA.

832x624 @ 75 Hz (Mac)

With the monitor sense pins R8 and R9 joined together I get
640x480 @ 67 Hz (Mac).

Leaving the sense pins (R8 R9) unconnected
might give 640x480 @ 60 Hz (VGA) but I hav'nt tried it.

With the sense pins connected with the diode I was getting the
832x624 @ 75 Hz (Mac) mode which put my PC monitor in a spin.

The 1024 x 768 resolution info should be 832x624 @ 75 Hz
(the highest of the 6100 Dram Video modes).

Jeremy

"I'll see you on the Dark Side Of The Moon" - Pink Floyd

btw the solder points on the 6100 logic board are surface mount components so soldering care is needed.

I suggest doing a one time solder to the surface mount components points using some extension wire then use the other end of the wire for further soldering (ie attaching a diode etc).

I tried the R8 R9 without being connected together and I still got the 680x480 @ 67Hz (Mac) not the 640x480 @ 60hz (VGA).

Using the diode gives 832x624 @ 75 Hz (Mac) as well as the
680x480 @ 67Hz (Mac).

I used a VGA female connector but you could also use a Mac D shaped connector as well.

Just get the pinout diagrams ( rgb hsync vsync etc) for both connectors and map the connections.

Personally I'd leave out any diodes and/or sense pin wiring when soldering. That way the mac can sense what monitor I'm plugging in rather than being permanently set at one resolution

If you can't find an adapter cable there is a better way to do it than soldering connections to the logic board.

VGA HDI45

Blue 03 45
Blue ground Ground 44
Red 01 27
Red ground Ground 26
Green 02 11
Green ground Ground 10
Hsync 13 42
Vsync 14 33

Ground 06,07,08,09,10,11 43

Monitor Sense Pins HDI45 09 18 joined together
(can be diode for multisync monitors)
and HDI45 08 left unconnected for VGA

if HDI45 08 is grounded all mac (non vga) resolutions appear
in the monitors control panel

This is for a HDI-45 to PC style VGA adapter and will also work with other mac models (not just the 6100) that use the infamous HDI-45 connector.

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