2716/2732 programmer

1-26 — elektor january 1982 2716/2732 programmer P.R. Boldt There are a number of differences between the programmer published in the October 1981 issue and the circuit featured here. The earlier "plug-in" pro- grammer can only be used to program 2716 devices and the microprocessor system used has to have a "hold" facility. This latter means that it can not be used with the Junior Computer. The latest circuit can be used to program both 2716 and 2732 devices and has been designed specifically for use with the SC/MP and Junior Computer systems, although it can probably be used in other systems as well. A standard connector can be mounted on the printed circuit board for the new pro- The circuit diagram Before having a closer look at the pro- gramming, it is a good idea to examine the intricacies of the circuit itself (see figure 1). As stated previously, the address and data information has to be temporarily stored in latches. This is accomplished by means of IC1 ... IC4. The 271...