Taito TC0190 pinout: Difference between revisions
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PALs allow the programming of arbitrarily logic functions, but in | PALs allow the programming of arbitrarily logic functions, but in the PAL16R4, pins 1 and 11 have fixed functionality. This is why /ROMSEL is connected to both pins 1 and pin 2: pin 1 can ''only'' be used as a clock input to latch the value of D6, but /ROMSEL is also connected to pin 2 so that the PAL can fail to pass through the write to the TC0190 when the CPU writes to $E000. | ||
Revision as of 02:47, 16 September 2013
Taito TC0190: 0.6" high-density PDIP (Canonically iNES Mapper 033)
.--\/--.
(s) PRG D0 -> |01 40| -- Vcc
(s) PRG D1 -> |02 39| <- PRG R/W (F)
(s) PRG D2 -> |03 38| <- /ROMSEL (F)
(s) PRG D3 -> |04 37| <- M2 (F)
(s) PRG D4 -> |05 36| ?? NC
(s) PRG D5 -> |06 35| ?? NC
(s) PRG D6 -> |07 34| <- PPU A10 (F)
(s) PRG D7 -> |08 33| <- PPU A11 (F)
(r) PRG A13 <- |09 32| <- PPU A12 (F)
(r) PRG A14 <- |10 31| ?? GND
(r) PRG A15 <- |11 30| -> CIRAM A10 (F)
(r) PRG A16 <- |12 29| -> CHR A10 (r)
(r) PRG A17 <- |13 28| -> CHR A11 (r)
(r) PRG A18 <- |14 27| -> CHR A12 (r)
(s) PRG A0 -> |15 26| -> CHR A13 (r)
(s) PRG A1 -> |16 25| -> CHR A14 (r)
(F) PRG A13 -> |17 24| -> CHR A15 (r)
(F) PRG A14 -> |18 23| -> CHR A16 (r)
(r) PRG /CE <- |19 22| -> CHR A17 (r)
GND -- |20 21| ?? NC
'------'
Some boards added a PAL to the TC0190. As far as we can tell, the only purpose of the PAL was to move the mirroring control bit. This becomes a subset of iNES Mapper 048 instead:
TC0190 pin 30: (was CIRAM A10) now NC
TC0190 pin 38: (was /ROMSEL) now from PAL pin 12
PAL16R4
--\/--
(F) /ROMSEL -> |01 20| -- Vcc
(F) /ROMSEL -> |02 19| -> CIRAM A10 (F)
(F) PRG R/W -> |03 18| ?? NC
(F) PRG A14 -> |04 17| -> NC
(F) PRG A13 -> |05 16| -> NC
(F) PRG A1 -> |06 15| -> NC
(F) PRG A0 -> |07 14| -> NC
(F) PPU A11 -> |08 13| <- PRG D6 (s)
(F) PPU A10 -> |09 12| -> to TC0190 pin 38
GND -- |10 11| <- GND (PAL /OE signal)
------
PALs allow the programming of arbitrarily logic functions, but in the PAL16R4, pins 1 and 11 have fixed functionality. This is why /ROMSEL is connected to both pins 1 and pin 2: pin 1 can only be used as a clock input to latch the value of D6, but /ROMSEL is also connected to pin 2 so that the PAL can fail to pass through the write to the TC0190 when the CPU writes to $E000.
