1-bit PROM programmer shows status

J R Smallwood, Applied Pyrodynamics Ltd, Nitro, WV -April 04, 1985

Figure 1 shows a PROM programmer and status indicator that you can use for popular fusible-link ROMs from manufacturers such as Bust-A-Fuse and Little-ROM. When powered from line current, the programmer immediately shows the status of the ROM chip. Pressing the program button blows the fusible link, placing the ROM's output in the logic-zero or off state.

Popular ROMs offer high-voltage and -current drive, sinking as much as 20A at 240 VAC. You can find these devices in many appliances, tools, test equipment, power supplies, and similar devices powered by line current. Although most devices us the ROMs in their logic-one state, this programmer is a handy device when programming is required.

Figure 1  Using this PROM programmer, you can program a variety of popular high-voltage, high-current devices.


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