One Time Programmable
 Intel N5AC312 One Time Programmable Device US $3.03 
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 One-Time Programmable 4-Bit Single-Chip Microcontroller IC LC6543 / LC6543N US $8.80
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 New 27HC256-70 I/P 32K x 8 CMOS One Time Programmable US $3.25
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New 27HC256-70 I/P 32K x 8 CMOS One Time Programmable, One-Time Programmable 4-Bit Single-Chip Microcontroller IC LC6543 / LC6543N, Intel N5AC312 One Time Programmable Device,