I'm having a hard time confirming which pin on the SNES cart edge is Chip Enabled and which is Output Enabled.
My guess would be that pin 49 is /CE (aka /CS) and pin 23 is /OE. However...
This is the mask ROM pinout that I see everywhere. Using this ROM pinout and my multimeter, it's telling me that...
Cart edge pin 49 (/CART) goes to mask ROM pin 31 (/OE)
Cart edge pin 23 (/RD) goes to mask ROM pin 22 (/CE)
I once read (in this post), in reference to /CE, that ROMlab is messed up. I also recall once reading in another thread on NesDev (although I cannot find it now) that SNES /CE and /OE are often confused.
So my question is, definitively, which is which?
Code:
+--------+
21.477MHz Clock | 1 32 | /WRAM
EXPAND | 2 33 | REFRESH
PA6 | 3 34 | PA7
/PARD | 4 35 | /PAWR
|--------|
GND | 5 36 | GND
F A11 | 6 37 | A12
r A10 | 7 38 | A13
o A9 | 8 39 | A14
n A8 | 9 40 | A15
t A7 | 10 41 | A16
A6 | 11 42 | A17
o A5 | 12 43 | A18
f A4 | 13 44 | A19
A3 | 14 45 | A20
c A2 | 15 46 | A21
a A1 | 16 47 | A22
r A0 | 17 48 | A23
t /IRQ | 18 49 | /CART
D0 | 19 50 | D4
D1 | 20 51 | D5
D2 | 21 52 | D6
D3 | 22 53 | D7
/RD | 23 54 | /WR
CIC out data (p1) | 24 55 | CIC out data (p2)
CIC in data (p7) | 25 56 | CIC in clock (p6)
/RESET | 26 57 | CPU_CLOCK
Vcc | 27 58 | Vcc
|--------|
PA0 | 28 59 | PA1
PA2 | 29 60 | PA3
PA4 | 30 61 | PA5
Left Audio Input | 31 62 | Right Audio Input
21.477MHz Clock | 1 32 | /WRAM
EXPAND | 2 33 | REFRESH
PA6 | 3 34 | PA7
/PARD | 4 35 | /PAWR
|--------|
GND | 5 36 | GND
F A11 | 6 37 | A12
r A10 | 7 38 | A13
o A9 | 8 39 | A14
n A8 | 9 40 | A15
t A7 | 10 41 | A16
A6 | 11 42 | A17
o A5 | 12 43 | A18
f A4 | 13 44 | A19
A3 | 14 45 | A20
c A2 | 15 46 | A21
a A1 | 16 47 | A22
r A0 | 17 48 | A23
t /IRQ | 18 49 | /CART
D0 | 19 50 | D4
D1 | 20 51 | D5
D2 | 21 52 | D6
D3 | 22 53 | D7
/RD | 23 54 | /WR
CIC out data (p1) | 24 55 | CIC out data (p2)
CIC in data (p7) | 25 56 | CIC in clock (p6)
/RESET | 26 57 | CPU_CLOCK
Vcc | 27 58 | Vcc
|--------|
PA0 | 28 59 | PA1
PA2 | 29 60 | PA3
PA4 | 30 61 | PA5
Left Audio Input | 31 62 | Right Audio Input
My guess would be that pin 49 is /CE (aka /CS) and pin 23 is /OE. However...
This is the mask ROM pinout that I see everywhere. Using this ROM pinout and my multimeter, it's telling me that...
Cart edge pin 49 (/CART) goes to mask ROM pin 31 (/OE)
Cart edge pin 23 (/RD) goes to mask ROM pin 22 (/CE)
I once read (in this post), in reference to /CE, that ROMlab is messed up. I also recall once reading in another thread on NesDev (although I cannot find it now) that SNES /CE and /OE are often confused.
So my question is, definitively, which is which?