28C256 to 27C256: Difference between revisions
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=27C256 | =28C256 to 27C256 adapter= | ||
This is an adapter PCB to plug a 28C256 into a socket that expects a 27C256. The 28C256 is | 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 | |||
</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/ | 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
