trunk/src/mess/audio/upd1771.c
| r20963 | r20964 | |
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| 1 | 1 | /********************************************************************** |
| 2 | 2 | |
| 3 | | NEC uPD1771 as used in the Epoch Super Cassette Vision (SCV) |
| 3 | NEC uPD1771-017 as used in the Epoch Super Cassette Vision (SCV) |
| 4 | 4 | |
| 5 | 5 | Made using recording/analysis on a Yeno (PAL Super Cassete Vision) |
| 6 | 6 | by plgDavid |
| r20963 | r20964 | |
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| 113 | 113 | GND 14 15 ? tied to pin 16 (VCC) through a resistor (pullup?) |
| 114 | 114 | |
| 115 | 115 | Pinout based on guesses and information in "Electronic Speech Synthesis" by Geoff Bristow |
| 116 | | (ISBN 0-07-007912-9, pages 148-152); [x] is unsure: |
| 116 | (ISBN 0-07-007912-9, pages 148-152), and the data on page 233 of the Nec APC technical manual at |
| 117 | http://bitsavers.trailing-edge.com/pdf/nec/APC/819-000100-1003_APC_System_Reference_Guide_Apr83.pdf |
| 118 | [x] is unsure: |
| 117 | 119 | PB3 1 28 PB2 |
| 118 | 120 | PB4(/ALE) 2 27 PB1 |
| 119 | 121 | PB5(/RD) 3 26 PB0 |
| 120 | | PB6(/WR) 4 25 PA7 |
| 121 | | PB7(/CS) 5 24 PA6 |
| 122 | | /EXTINT? 6 23 PA5 |
| 123 | | [RESET?] 7 22 PA4 |
| 124 | | VCC 8 21 PA3 |
| 125 | | XI 9 20 PA2 |
| 126 | | XO 10 19 PA1 |
| 127 | | D/A OUT + 11 18 PA0 |
| 128 | | [D/A VREF?] 12 17 [MODE3?] |
| 129 | | D/A OUT - 13 16 [MODE2?] |
| 130 | | GND 14 15 [MODE1/TEST/RESET?] tied to pin 16 (VCC) through a resistor (pullup?) |
| 122 | PB6(/WR) 4 25 D7(PA7) |
| 123 | PB7(/CS) 5 24 D6(PA6) |
| 124 | /RESET 6 23 D5(PA5) |
| 125 | [TEST?] 7 22 D4(PA4) |
| 126 | VCC 8 21 D3(PA3) |
| 127 | XI(CLK) 9 20 D2(PA2) |
| 128 | XO 10 19 D1(PA1) |
| 129 | D/A OUT + 11 18 D0(PA0) |
| 130 | [D/A VREF] 12 17 CH2 |
| 131 | D/A OUT - 13 16 /EXTINT |
| 132 | GND 14 15 CH1 tied to pin 16 (VCC) through a resistor, on APC to VCC thru a 12k resistor and thru a 10uf cap to gnd |
| 131 | 133 | |
| 132 | | In the SCV: |
| 134 | CH1 and CH2 are some sort of mode selects? |
| 135 | |
| 136 | In the SCV (info from plgDavid): |
| 133 | 137 | pin 5 is tied to the !SCPU pin on the Epoch TV chip pin 29 (0x3600 writes) |
| 134 | 138 | pin 6 is tied to the PC3 pin of the upD7801 CPU |
| 135 | 139 | pin 26 is tied to the INT1 pin of the upD7801 (CPU pin 12), |