View source for VT02 / VT03 pinout

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                              _______
                             /    91 \ -- GND
                    /CS0 <- / 1    90 \ -> CPU A5
                   /CS1 <- / 2      89 \ <> CPU D6
                CPU D5 <> / 3        88 \ -> CPU A6
              CPU A14 <- / 4          87 \ <> CPU D7
              CPU D3 <> / 7            86 \ -> CPU A7
             CPU A2 <- / 8              85 \ -> CPU A14
            CPU D2 <> / 9                84 \ -> CPU A8
           CPU A1 <- / 10                 83 \ -> CPU A13
             GND -- / 11                   82 \ -> CPU A9
         CPU D1 <> / 12                     81 \ -> CPU A12
        CPU A0 <- / 13                       80 \ -> CPU A10
       CPU D0 <> / 14                         79 \ <- CPU CLK (1.8MHz)
         R/W <- / 15                           78 \ -- VCC
    /ROMSEL <- / 16                             77 \ -> CPU A11
      /IRQ -> / 17                               76 \ <- $4016.0
  PPU R/W <- / 18                                 75 \ <> IOCLK1
     VDE <- / 19                                   74 \ <> IO2
     VCC -- \ 20                                    73 \ -> IO1
      ERS <- \ 21                                    72 \ <- $4017.4
 CIRAM A10 -> \ 22                                    71 \ -> IO0
     PPU A6 <- \ 23                                    70 \ <- $4017.3
      PPU A7 <- \ 24                                    69 \ <- $4016.1
       PPU A5 <- \ 25                                    68 \ <- $4017.2
        PPU A8 <- \ 26                                    67 \ <> IOCLK0
         PPU A4 <- \ 27                                    66 \ <- $4017.1
          PPU A9 <- \ 28                                    65 \ <- /FH
           PPU A3 <- \ 29                                   64 / -- VCC
           PPU A10 <- \ 30                                 63 / <- /BTS
             PPU A2 <- \ 31                               62 / <- $4017.0
             PPU A11 <- \ 32                             61 / -> Crystal Out
                  VCC -- \ 33                           60 / <- Crystal In
                PPU A1 <- \ 34                         59 / <- /IJSE
                PPU A12 <- \ 35                       58 / <- /16B
                  PPU A0 <- \ 36                     57 / <- OBS
                     /ERS -- \ 37                   56 / -- GND
                    /SFCCS -- \ 38                 55 / -> Audio Out 1
                     PPU D0 <> \ 39               54 / -> Audio Out 0
                      PPU D7 <> \ 40             53 / <- /RST
                       PPU D1 <> \ 41           52 / <- Test Pin
                        PPU D6 <> \ 42         51 / -> VOUT
                         PPU D2 <> \ 43       50 / <- REG0
                          PPU D5 <> \ 44     49 / <- REG1
                           PPU D3 <> \ 45   48 / <- /LCDEN
                            PPU D4 <> \ 46 47 / -- GND
                                       \_____/

* /CS0: /CS for $6000 - $7FFF
* /CS1: /CS for $8000 - $FFFF
* VDE: Video Data Output Enable; I/O in OneBus Mode
* ERS: External ROM chip selector / Power on Indicator / I/O in OneBus Mode
* /SFCCS: Swap the function of /CS0 and /CS1 when low
* /LCDEN: Enable LCD Output for Testing
* REGx: Region Selector. All 0 = NTSC, All 1 = PAL
* OBS: OneBus Mode Enable
* /16B: 16 bits data bus selector in OneBus Mode. A0 will decide the low byte or high byte of data on CPU D0-7
* /IJSE: Internal Joystick Enable when XJOYSEL = 0
* /BTS: Bus tristate enable
* /FH: Force /CS0 and /CS1 High
* IOCLKx: Clock of I/O or XCUP47, can be video extention address
* IOx: I/O interface OUtput pins or Video extention address

Based on http://www.vrt.com.tw/old_site/admin/upload/datasheet/VT02%20Data%20Sheet%20RevisionA5_ENG__1.pdf