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PROGRAMMABLE ROM (PROM):
The user can program a PROM after purchase. Each memory bit element in the PROM contains a nichrome or silicon link that acts as a fuse. The user can selectively 'but out' or 'blow' these fuses by applying pulses of current to the appropriate pins of the IC. A memory element with a non-ruptured fuse stores a 1 and a ruptured fuse stores a 0. The programming is irreversible, so it must be right first time. Figure 11 shows the circuit for a PROM.
PROM Circuit
PROMs are capable of high operating speeds, but consume a relatively large amount of power. However, since they are non-volatile, they can be switched off when not being accessed.
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