Msx Extensions 5: Eprom Programmer (2)

A, ,FsE MSX EXTENSIONS 5: EPROM PROGRAMMER (2) The supporting software for the programmer is an EPROM-resident block of Z80 machine code that provides a deluxe menu, help pages, a built-in test routine, and, of course, EPROM status information plus error reports. After last month"s discussion of the programmer hardware, we will now study the way it is actu- ally controlled from the MSX computer. To begin with, how- ever, we will briefly detail the workings of intelligent pro- the number of programming pulses required to successfully load a byte into an EPROM ad- dress. Iteration and pulse multiplication are effected in accordance with the flowchart shown in Table 4. Extensive tests have shown that the adopted algorithm gives satis- factory results with the vast ma- jority of intelligently program- mable EPROMs. Although not expressly indi- cated in the flowchart, the con- trol program and the CTC ensure that EPROM data and gramming, last month. already hinted at The intelligent pr...