28C256 to 27C256: Difference between revisions

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m (Bkw moved page 27C256 28C256 to 28C256 to 27C256)
 
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=27C256 to 28C256 adapter=
=28C256 to 27C256 adapter=
This is an adapter PCB to plug a 28C256 into a socket that expects a 27C256. The 28C256 is (re)programmable without needing a test clip, by virtue of on-board jumpers to switch the pinout between 27C256 and 28C256.
This is an adapter PCB to plug a 28C256 into a socket that expects a 27C256 or a mask rom.
 
The 28C256 is programmable without needing a test clip, by virtue of on-board jumpers to switch the pinout between 27C256 and 28C256. The board is also it's own programming adapter.


<gallery>
<gallery>
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27C256_28C256-3.png
27C256_28C256-3.png
27C256_28C256-4.png
27C256_28C256-4.png
28C256_to_27C256_5.jpg
28C256_to_27C256_6.jpg
FlashROM_8300_14.jpg
FlashROM_8300_14.jpg
</gallery>
How to do the DIP legs
<gallery>
SIL_leadframe_1.jpg
SIL_leadframe_2.jpg
SIL_leadframe_3.jpg
SIL_leadframe_4.jpg
SIL_leadframe_5.jpg
SIL_leadframe_6.jpg
SIL_leadframe_7.jpg
SIL_leadframe_8.jpg
SIL_leadframe_9.jpg
</gallery>
</gallery>


Source: http://github.com/bkw777/aDIPters
Source: http://github.com/bkw777/aDIPters


PCB: https://oshpark.com/shared_projects/pYmaUMlK
PCB: [https://oshpark.com/shared_projects/JXeEqfZ8 OSHPark] or [https://www.pcbway.com/project/shareproject/28C256_to_27C256.html PCBWAY]

Latest revision as of 21:35, 7 April 2021

28C256 to 27C256 adapter

This is an adapter PCB to plug a 28C256 into a socket that expects a 27C256 or a mask rom.

The 28C256 is programmable without needing a test clip, by virtue of on-board jumpers to switch the pinout between 27C256 and 28C256. The board is also it's own programming adapter.

How to do the DIP legs

Source: http://github.com/bkw777/aDIPters

PCB: OSHPark or PCBWAY