NEO-BUF: Difference between revisions

From NeoGeo Development Wiki
Jump to navigation Jump to search
No edit summary
Line 15: Line 15:
==Pinout==
==Pinout==


[[File:Neo-buf_pinout.png]]
{{Pinout|NEO-BUF|512px}}
 
OpenOffice Draw file: [[File:neo-buf.odg]]


==Replacement==
==Replacement==

Revision as of 01:39, 8 July 2018

Package QFP48
Manufacturer
First use 1994 ?
Used on MV1A MV1B NEO-CDM3-2_board

Dual 74HC245 octal transceivers in one chip. This chip is extensively used in CD systems to multiplex subsystem and 68k accesses to DRAMs.

Also found on late MVS boards.

Pinout


Edit this pinout

Replacement

Picture from MVS-Scans

On some MVS boards, some NEO-BUF chips are just used as buffers for the 68k data bus. There are reports of succesful repairs done by replacing them with a small bypass board which simply connects the A side with the B side (see picture).

Note that this should NOT be done to replace damaged NEO-BUF chips which are used for other purposes. This can only work for:

  • GA1 on the SLOT1B board of the MV1B
  • GA11 on the MV1A