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upd1771.c: Further documentation updates based on the NEC APC technical manual; now all pin names except two are known. [Lord Nightmare]

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This commit is contained in:
Jonathan Gevaryahu 2013-02-11 22:18:08 +00:00
parent 7ebb81112e
commit 3a2752da82
1 changed files with 18 additions and 14 deletions
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32
src/mess/audio/upd1771.c
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@ -1,6 +1,6 @@
/**********************************************************************
NEC uPD1771 as used in the Epoch Super Cassette Vision (SCV)
NEC uPD1771-017 as used in the Epoch Super Cassette Vision (SCV)
Made using recording/analysis on a Yeno (PAL Super Cassete Vision)
by plgDavid
@ -113,23 +113,27 @@
GND 14 15 ? tied to pin 16 (VCC) through a resistor (pullup?)
Pinout based on guesses and information in "Electronic Speech Synthesis" by Geoff Bristow
(ISBN 0-07-007912-9, pages 148-152); [x] is unsure:
(ISBN 0-07-007912-9, pages 148-152), and the data on page 233 of the Nec APC technical manual at
http://bitsavers.trailing-edge.com/pdf/nec/APC/819-000100-1003_APC_System_Reference_Guide_Apr83.pdf
[x] is unsure:
PB3 1 28 PB2
PB4(/ALE) 2 27 PB1
PB5(/RD) 3 26 PB0
PB6(/WR) 4 25 PA7
PB7(/CS) 5 24 PA6
/EXTINT? 6 23 PA5
[RESET?] 7 22 PA4
VCC 8 21 PA3
XI 9 20 PA2
XO 10 19 PA1
D/A OUT + 11 18 PA0
[D/A VREF?] 12 17 [MODE3?]
D/A OUT - 13 16 [MODE2?]
GND 14 15 [MODE1/TEST/RESET?] tied to pin 16 (VCC) through a resistor (pullup?)
PB6(/WR) 4 25 D7(PA7)
PB7(/CS) 5 24 D6(PA6)
/RESET 6 23 D5(PA5)
[TEST?] 7 22 D4(PA4)
VCC 8 21 D3(PA3)
XI(CLK) 9 20 D2(PA2)
XO 10 19 D1(PA1)
D/A OUT + 11 18 D0(PA0)
[D/A VREF] 12 17 CH2
D/A OUT - 13 16 /EXTINT
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
In the SCV:
CH1 and CH2 are some sort of mode selects?
In the SCV (info from plgDavid):
pin 5 is tied to the !SCPU pin on the Epoch TV chip pin 29 (0x3600 writes)
pin 6 is tied to the PC3 pin of the upD7801 CPU
pin 26 is tied to the INT1 pin of the upD7801 (CPU pin 12),