DIS23C01 pinout

DAOU ROM CONTROLLER DIS23C01 Daou 245 (Mapper 156)

                                   _____
                                  /     \                             Orientation:
                     NC (cut) -- / 1  64 \ -- NC (cut)                --------------------
                     GND (*) -- / 2    63 \ <- CPU A1                     51         33
                     CPU A2 -> / 3  (o) 62 \ <- CPU A0                     |         |
                    CPU A3 -> / 4        61 \ ?? always low               .-----------.
                   CPU A4 -> / 5          60 \ ?? always low           52-|o DAOU    o|-32
                 CPU R/W -> / 6            59 \ -- VCC                    |  DIS23C01 |
                    GND -- / 7              58 \ ?? alway high (cut)   64-|o DaOU 245 |-20
               CPU A14 -> / 8                57 \ ?? always high          \-----------'
                  GND -- / 9                  56 \ ?? always high          |         |
             CIR A10 <- / 10                   55 \ ?? always high       01         19
            PRG /CE <- / 11                     54 \ ?? always high
 /IRQ (always low) <- / 12                       53 \ ?? always high
          PRG A14 <- / 13                         52 \ ?? always high
         PRG A15 <- / 14      DAOU DIS23C01       51 / ?? always high
        PRG A16 <- / 15      Package QFP-64      50 / <- CPU D7
       PRG A17 <- / 16        1.00mm pitch      49 / <- CPU D6
      PRG A18 <- / 17         (20mm × 14mm)    48 / <- CPU D5
     PRG A19 <- / 18                          47 / <- CPU D4
    PRG A20 <- / 19                          46 / <- CPU D3
    CHR A10 <- \ 20                         45 / <- CPU D2
         GND -- \ 21                       44 / <- CPU D1
      CHR A11 <- \ 22                     43 / <- CPU D0
       CHR A12 <- \ 23                   42 / -- GND       
        CHR A13 <- \ 24                 41 / <- M2         
             VCC -- \ 25               40 / <- PPU A12     
always high (cut) ?? \ 26             39 / <- PPU A11      
           CHR A14 <- \ 27           38 / <- PPU A10       
            CHR A15 <- \ 28         37 / -- GND            
             CHR A16 <- \ 29       36 / <- CPU /ROMSEL     
              CHR A17 <- \ 30     35 / -- GND            
               CHR A18 <- \ 31   34 / -- VCC             
                CHR A19 <- \ 32 33 / ?? always high                 
                            \     /                      
                             \   /                       
                              \ /                        
                               V     

notes:

• pins 1, 64 - no internal connection; externally cut from the package (NC)
• pin 2 - no external con, internally connected to other ground pins
• pins 26, 58 - externally cut
• PRG A pins reflect the bank being set only when M2 is high; when M2 is low, they always go high
• CIRAM A10 is not connected to mapper (premanently wired to GND) on this board (Koko Adventure)
• IRQ pin seems to be non-functional (it is always low)
• This board uses weird pinouts for PRG/CHR eproms (32 holes, pin 2 and 24 both shorted and connected to PRG/CHR A16 respectively), but eproms have pins 24 cut and not soldered to anything (floating)
• A lot of not used pins (but showing signs of internal connection) suggests that this chip maybe some kind of PLD instead of ASIC (just like BF909x from codemasters)

Source: [1]]