Burning EPROMS

Pinball machines use three types of programmable devices. By far the most common are EPROMs, used to store code, sound and graphics for solid state machines. They can be erased and re-used any times. Early machines use bipolar PROMs, devices that can be programmed only once. And many machines use programmable logic, with simpler devices (PALs and GALs) replacing a handful of TTL chips, and more complex devices carrying most of a video or sound subsystem.

Willem Programmers These programmer are the least expensive available. They all run using open-source software. The simplest systems run from the parallel port and an external power supply, and have a tricky configuration using DIP switches and jumpers. Upgrades to the basic devices include USB power (you still need the parallel port); USB interface and power; and electronic configuration. Recommended True USB version $80 - 120

Pocket Programmer Designed and built in the U.S., these devices have been the standard for the industry. Programs 2708 with an adapter; Recomended: USB version, about $270

Wellon Programmers Designed and made in China,these devices use programmable pin drivers rather than TTL to program the parts. This approach means that Wellons can program a wider range of devices than other programmers. Recommended: VP280, $120