RAMDAC 256 x 18

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Cross-Reference
BRAND TAG NUMBER PIN COUNT OUTPUT MARKINGS
Analod Devices ADV 476 DIP28 LCC44 ADV476
Brooktree BT 471 LCC44 . BT471KP BT471KPJ
Brooktree BT 476 DIP28 LCC44 . BT476KP BT476KPJ
Hualon Microelectronics HM 86171 DIP28 HM86171

Random Access Memory Digital-to-Analog Converter 256 x 18 Color Palette (DIP28, 600mil)(LCC44)

Size

bit Byte (unpadded) Hex
4608 576 1200hex

Pinout

DIP28
         +---\/---+
     RED | 1    28| Vcc
   GREEN | 2    27| RS1
    BLUE | 3    26| RS0
    Iref | 4    25| *WR
      P0 | 5    24| D7
      P1 | 6    23| D6
      P2 | 7    22| D5
      P3 | 8    21| D4
      P4 | 9    20| D3
      P5 |10    19| D2
      P6 |11    18| D1
      P7 |12    17| D0
    Pclk |13    16| *BLANK
Vss(gnd) |14    15| *RD
         +--------+

LCC44 (valid for 476)
+-----------------------------------------------+
| 40 Clock  |  7 *BLANK  | 18 RS1    | 29 COMP  |
| 41 GND    |  8 D0      | 19 GND    | 30 OPA   |
| 42 GND    |  9 D1      | 20 Vcc    | 31 Vref  |
| 43 GND    | 10 D2      | 21 Vcc    | 32 P0    |
| 44 GND    | 11 D3      | 22 Vcc    | 33 P1    |
|  1 NC     | 12 D4      | 23 GND    | 34 P2    |
|  2 GND    | 13 D5      | 24 GND    | 35 P3    |
|  3 GND    | 14 D6      | 25 RED    | 36 P4    |
|  4 Vcc    | 15 D7      | 26 GREEN  | 37 P5    |
|  5 GND    | 16 *WR     | 27 BLUE   | 38 P6    |
|  6 *RS    | 17 RS0     | 28 Iref   | 39 P7    |
+-----------------------------------------------+

LCC44 (valid for 471)
+-----------------------------------------------+
| 40 Clock  |  7 *BLANK  | 18 RS1    | 29 COMP  |
| 41 OL0    |  8 D0      | 19 GND    | 30 OPA   |
| 42 OL1    |  9 D1      | 20 Vcc    | 31 Vref  |
| 43 OL2    | 10 D2      | 21 Vcc    | 32 P0    |
| 44 OL3    | 11 D3      | 22 Vcc    | 33 P1    |
|  1 NC     | 12 D4      | 23 SETUP  | 34 P2    |
|  2 NC     | 13 D5      | 24 GND    | 35 P3    |
|  3 GND    | 14 D6      | 25 RED    | 36 P4    |
|  4 Vcc    | 15 D7      | 26 GREEN  | 37 P5    |
|  5 GND    | 16 *WR     | 27 BLUE   | 38 P6    |
|  6 *RS    | 17 RS0     | 28 Iref   | 39 P7    |
+-----------------------------------------------+


External links

RAM-DAC page on wikipedia

Frequency

DIP28
Set reader to FREQ, put black probe to GND, red probe to 13 to measure CPU clock

PLCC44
Set reader to FREQ, put black probe to GND, red probe to 40 to measure CPU clock

Files