Model 3 Step 2 board schematics

[Gjay]

Hello!

I found a schematic diagram of the Model 3 Step 2 video board at
https://github.com/MisterTea/MAMEHub/bl ... s/model3.c:
which I will include at the bottom.

If I compare it to actual photos of a Model 3 Step 2 Video board, the schematic seems way larger and extended at the bottom.

For example, there's the usual half-circle of 4x Sega 315-6060 "Mars"-chips present, which you can see on the actual board.
But at the bottom of the schematic image, two more 315-6060s are listed.

Can anyone tell me what's going on there?

See the following screenshot:




Edit: I made it clearer in the picture what I mean.

I ask this because on the page segaretro.com , it lists the Model 3 board having 6 of those 315-6060 "Mars"-Rasterizer-processors without giving any source or merely, the sources they give do not confirm this.
Wanted to check if it is true or not, but all I could find was this schematical image of the board, which does not seem right.

[Gjay]

For comparison, this is the annotated video board that model3man posted in the old forums.

Dark blue is Mars (315-6060 + assigned RAM):

[gm_matthew]

Whoever came up with that schematic accidentally duplicated many of the lines. Here's what it is supposed to look like:

Code: Select all

|---------------------------------------------------------------------------------------------------|
|                                                                                                   |
|  D4811650GF  D4811650GF                   33MHz   M5M4V4169  M5M4V4169  M5M4V4169  M5M4V4169      |
|                         D4811650GF                M5M4V4169  M5M4V4169  M5M4V4169  M5M4V4169      |
|                                              M5M410092FP                                          |
|                                              (TQFP128)                                  M5M4V4169 |
|                           SEGA                            SEGA                          M5M4V4169 |
|              SEGA         315-6058                        315-6060                                |
|              315-6057     (BGA)                           (BGA)                         M5M4V4169 |
|  SEGA        (BGA)                                                                      M5M4V4169 |
|  315-6022                                                                                         |
|  (QFP208)                KM4132G271AQ-10     SEGA                      SEGA                       |
|                          (QFP100)            315-6059                  315-6060         M5M4V4169 |
|                                              (BGA)                     (BGA)            M5M4V4169 |
|                                                                                                   |
|                                                                                                   |
|            M5M410092FP                       M5M410092FP                                M5M4V4169 |
|  SEGA      (TQFP128)                         (TQFP128)                                  M5M4V4169 |
|  315-6061              M5M410092FP                                                                |
|  (BGA)                 (TQFP128)                                                        M5M4V4169 |
|            M5M410092FP                                                                  M5M4V4169 |
|            (TQFP128)       M5M410092FP                                                            |
|                            (TQFP128)         SEGA                      SEGA             M5M4V4169 |
|     SEGA      M5M410092FP                    315-6059                  315-6060         M5M4V4169 |
|     315-5648  (TQFP128)      M5M410092FP     (BGA)                     (BGA)                      |
|     (QFP64)                  (TQFP128)                    SEGA                                    |
|                                                           315-6060                      M5M4V4169 |
|                                                           (BGA)                         M5M4V4169 |
|                                                                                                   |
|                                                                                         M5M4V4169 |
|                                                                                         M5M4V4169 |
|  ADV7120KP30                                                                                      |
|  (PLCC44)                                                                                         |
|                                                   M5M4V4169  M5M4V4169  M5M4V4169  M5M4V4169      |
|                                                   M5M4V4169  M5M4V4169  M5M4V4169  M5M4V4169      |
|                                                                                                   |
|---------------------------------------------------------------------------------------------------|

[Gjay]

Yes... I had that impression as well, maybe an error when pasting. Thank you for clearing this up.