Talk:Comparison of Nintendo mappers

Rare discrete logic

You probably don't actually want to use these, especially not #78.

iNES	Chips	Max PRG	PRG bank size	Max CHR	CHR bank size	Mirroring	PRG RAM?	Bus conflicts?
11	1	128	32	128	8	V/H hardwired	No	Yes
38	2	128	32	32	8	V/H hardwired	Impossible	No
70	3	256	16 + 16F	128	8	V/H hardwired	No	Likely
72	4+speech	256	16 + 16F	128	8	V/H hardwired	No	Yes
77	4	512	32	32 + 6RAM	2	4	No	Likely
78a	5	128	16 + 16F	128	8	V/H switchable	No	Likely
78b	3	128	16 + 16F	128	8	1	No	Likely
79	2	64	32	64	8	V/H hardwired	No	No
86	3+speech	128	32	64	8	V/H hardwired	Impossible	No
87	2	32		32	8	V/H hardwired	Impossible	No
89	(2)†	128	16 + 16F	128	8	1	No	Yes
92	5+speech	256	16F + 16	128	8	V/H hardwired	No	Yes
93	(2)†	128	16 + 16F	8‡		V/H hardwired	No	Yes
94	2	128	16 + 16F	8		V/H hardwired	No	Likely
96	3	128	32	32RAM	16	V/H hardwired	No	Likely
140	3	128	32	128	8	V/H hardwired	Impossible	No
152	3	128	16 + 16F	128	8	1	No	Likely
184	(3)†	32		32	4 + 4	V/H hardwired	Impossible	No

† Mappers 89, 93, and 184 exist as a single IC, however their functions are trivially described using a small number of 7400-series ICs, and likely contain multiple silicon dice that were wire bonded together in the same package.

‡ Mapper 93 is technically the same 89 other than mirroring, but it only commercially existed using 8kB of CHR-RAM