RP2C33A

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Famicom Disk controller ASIC

          ___  ___
         |*  \/   |
/PRG  >01]        [64<  VCC
 A14  >02]        [63]  XTAL
 A13  >03]        [62]  XTAL
 A12  >04]        [61<  VEE
 A11  >05]        [60]  (02)
 A10  >06]        [59]  (09)
 A9   >07]        [58]  (08)
 A8   >08]        [57<  R/W
(22)  [09]        [56<  PHI2
(23)  [10]        [55>  /IRQ
(24)  [11]        [54>  AOUT
(04)  [12]        [53<  VEE
(05)  [13]        [52>  SER OUT
(06)  [14]        [51<  SER IN
(03)  [15]        [50>  $4025W.2
 A7   >16]  2C33  [49>  $4025W.1
 A6   >17]        [48>  $4025W.0
 A5   >18]        [47<  $4032R.2
 A4   >19]        [46<  $4032R.1
 A3   >20]        [45<  $4032R.0
 A2   >21]        [44]  EXT0
 A1   >22]        [43]  EXT1
 A0   >23]        [42]  EXT2
 --   [24]        [41]  EXT3
 D0   [25]        [40]  EXT4
 D1   [26]        [39]  EXT5
 D2   [27]        [38]  EXT6
 D3   [28]        [37]  EXT7/BATT
 D4   [29]        [36<  CHR A10
 D5   [30]        [35<  CHR A11
 D6   [31]        [34>  VRAM A10
 VEE  >32]        [33]  D7
         |________|

Source: Famicom Disk System technical reference [1]