Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-23 00:39:36 +03:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

A little more info on the YMZ chips (nw)

Browse Source
This commit is contained in:
AJR 2017-06-02 19:50:29 -04:00
parent ab180936e6
commit 416b1c1034
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/devices/sound/ay8910.cpp
View File

@ -466,7 +466,13 @@ YM2203: 2 I/O ports
The 'F' revision only appears during the first year of production.
YM3439: limited info: CMOS version of YM2149?
YMZ284: limited info: 0 I/O port, different clock divider
The chip selection logic is again simplified here: pin 1 is /WR, pin 2 is
/CS and pin 3 is A0.
D0-D7 are conveniently all on one side of the 16-pin package.
Pin 8 is /IC (initial clear), with an internal pullup.
YMZ294: limited info: 0 I/O port
Pinout is identical to YMZ284 except for two additions: pin 8 selects
between 4MHz (H) and 6MHz (L), while pin 10 is /TEST.
OKI M5255, Winbond WF19054, JFC 95101, File KC89C72, Toshiba T7766A : differences to be listed
Decaps: