Program cpld with arduino mega6/11/2023 The 8086 being a pure 16-bit processor, requires that its boot ROM is a 16-bit device, so either I’ve got to have two 8-bit chips side by side (more common), or a single 16-bit. I’ve decided to keep it retro and use a 16-bit 27C4002 EPROM, a variant of the popular 8-bit 27C4001.įortunately for this project, there is still an awful lot of EPROMs in the world. A jumper is included to select the clock frequency. The board is designed to support all variants of the 8086: 8086, 8086-1, clocked at 5, 8 and 10MHz respectively. With the easy options relatively historically obscure, and this being purely a project of interest, it had to be an 8086, and to produce it in something that could pass its self off as an Arduino left me with several mountains to climb. At that point I might as well have just built something based on an 8051. To give an indication – take a look at this monster, I too constantly found myself reaching for the lesser 8088, with its 8 bit front side bus, this dramatically decreases this physical complexity, or even an 8086 based microcontroller like the esoteric 80186, or completely copping out and walking the path of least resistance: The 80188. The third revision of 8OD (that I have not yet written about), which includes a PCF8584 I2C master, a NOR flash module, and a character LCD half-shieldīut to achieve it? Well that is quite something else.
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