Sachen 74LS374N pinout: Difference between revisions
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[[Category:Pinouts]]Sachen “74LS374N”: 20-pin 0.3" DIP or epoxy blob on daughterboard (Canonically [[iNES Mapper 243]]) | [[Category:Pinouts]]Sachen “74LS374N”: 20-pin 0.3" DIP or epoxy blob on daughterboard (Canonically [[iNES Mapper 243]]) | ||
Most of Sachen's mapper ICs have names that collide with other well-known ICs, presumably as an initial round of | Most of Sachen's mapper ICs have names that collide with other well-known ICs, presumably as an initial round of misdirection to confuse would-be mass copiers. The 74LS374N is canonically an octal latch (Unlike the [[74377]], the actual '374 would require other support hardware to be used on the NES) | ||
.---V---. | .---V---. | ||
Revision as of 01:34, 18 May 2014
Sachen “74LS374N”: 20-pin 0.3" DIP or epoxy blob on daughterboard (Canonically iNES Mapper 243)
Most of Sachen's mapper ICs have names that collide with other well-known ICs, presumably as an initial round of misdirection to confuse would-be mass copiers. The 74LS374N is canonically an octal latch (Unlike the 74377, the actual '374 would require other support hardware to be used on the NES)
.---V---.
PRG A15 <- | 01 20 | -- Vcc
CIRAM A10 <- | 02 19 | <- CPU A8
PPU A11 -> | 03 18 | <- R/W
? ?? | 04 17 | <- M2
CPU A14 -> | 05 16 | <- PPU A10
CPU A0 -> | 06 15 | <- /ROMSEL
CPU D0 <> | 07 14 | <> CPU D2
CPU D1 <> | 08 13 | -> CHR A16/A14
CHR A13 <- | 09 12 | -> CHR A15/A13
Gnd -- | 10 11 | -> CHR A14/A15
'-------'
Nestopia's source asserts that at least one variant of this mapper can be read from.
Санчез denoted two different connectivities for the CHR pins. They correspond to the values of the actual hardware, and as exists in current documented dumps (although which is which is not known).
Reference: Санчез ( http://cah4e3.shedevr.org.ru/%5Blst%5D-sachen-mappers.txt )
