Service manual

42
A G e n e r a l Purpos e Eprom Bo a rd
We have designed a simple printed circuit board which you could use for experimentation,
or even build and sell to your friends. It allows you to fit a 2516, 2716, 2532, 2764,
27128 or 27256 Eprom and the layout makes provision for all the resistors you are likely to
need. The design includes a lot of options which you may not require and it is left to you to
decide which components you want to fit for your particular conversion, based on the
information given in this book.
Note that, in order to accommodate such a wide range of Eproms, some input pins are
connected permanently to +5v. The input locations must, therefore, take this into account.
Alternatively, to suit the particular Eprom fitted, you could cut the offending tracks and
connect the inputs to ground, instead.