Also note that an EPROM must never be removed from the working programmer, because the order in which the programming voltage and the supply voltage are removed might just be wrong. 1) looks crowded, it should be noted that most components go into the power supply to ensure that the high programming voltage is not applied to the EPROM until the 5 V supply voltage is present ~ the reverse sequence would have disastrous consequences. _Although the circuit diagram of the mini EPROM programmer (Fig. As has been shown in a number of projects in this magazine over the past few months, there are quite a few occasions whe.re no more than, say, 256 or 512 bytes are involved, such as where EPROMs lunetion as programmable look-up or conversion tables. it is a common misunderstanding to associate EPROMs with microcomputer systems that require large amounts of data.
![eprom programmer circuit eprom programmer circuit](https://demo.dokumen.tips/img/380x512/reader024/reader/2021012308/5aac79de7f8b9a2e088d0860/r-1.jpg)
Even if you eould manage to program bytes faultlessly at a rate of one per second, it would take more than 18 hours to load all 65,536 bytes (64 Kbytes) in a Type 27512 EPROM, the largest the present programmer can handle. _The programmer is definite-Iy not intended for loading huge amounts of data into EPROMs. First, they may not have a computer second, they do not mind spending some time on programming small amounts of data and third, they object to the expenditure on an instrument that is only occasionally called upon.
#Eprom programmer circuit manual#
_ Many constructors have good reasons for preferring a low-cost EPROM programmer with manual data and address to a full-blown programmer operating under computer control.