Needhams EMP-20

I use this device when I am prototyping hardware designs that need E-Prom, Prom, GAL, and Pal chips. I have it hooked to a MS-Dos 6.22 system. I know the system is old but it works. I use schema to draw my PAL chips and my schematics you see on this web site.

The EMP-20 programmer is an inexpensive, portable, parallel port programmer that was designed from the ground up to be fast and versatile. It easily connects to your PC through a standard parallel port. Since the EMP-20 doesn't use a bus slot, and fits easily into a briefcase, it is very useful for programming devices in the field, with a portable computer. The EMP-20 programs a wide variety of devices - See The EMP-20 programmer device list for more information. Each family module supports an entire family of devices. Three family modules are included in the base price of the programmer to support 8/16 bit EPROMS, 87xxx MICROS, and a number of PLDs, with vector testing available. See The EMP-20 programmer price sheet for more information. Relays and discrete DAC-controlled analog drivers provide power and ground connections.


The EMP-20 uses the same parallel port I/O scheme as the EMP series programmers, for an extremely fast communication.


Programming and verifying on a Pentium






19 Seconds



3 Seconds 



7 Seconds


The EMP-20 is extremely portable; since it doesn't occupy a bus card in your PC, you can pack it up and take it with you anytime you wish. At only 1.5"x5"x8", with a 2" high power transformer, the EMP-20 fits into a briefcase or toolbox with ease. The programmer, parallel cable, transformer, and Family Modules, together weigh in at less than three pounds!



Family Modules are not an entirely new idea. They have been used in other programmers from time to time, to inexpensively route power and ground to the device. When you're programming devices fairly slow, then straight, slide-in connectors are just fine. However, the EMP-20 programs at speeds near the theoretical maximum of some devices, so the digital signals traveling to the device must be clean, and the power and ground lines must be solid. Slide-in connectors can experience noise problems, higher resistance, and corrosion.



To use the EMP-20, you must have the following:



Download Software for EMP-20



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