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8-bit acorn hardware • Re: programming the atf1504

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You can use ATMISP to convert the .jed to an .svf which most jtag interfaces can use
https://www.microchip.com/en-us/product ... -resources
That sounds like the right answer. Any JTAG interface worth having should be able to play the SVF to the device. You'll just need to find one with non-windows software.

Alternatively, since I was passing the computer with the bits on, attached are the Xilinx appnotes on what is SVF, and their example code (they did it for an 8051) on how to bit-bang that, should you (or anybody else) feel like porting it the to the beeb. (While the innards of JTAG sound scary, the hard bit is creating the SVF file. The SVF file then says - in effect - which pins to wiggle in which order, and what to expect back... Xilinx added an extra complication by compressing the SVF from ASCII to binary first, but that's not really necessary).
xapp058 - JTAG ISP.zip

xapp058 - JTAG ISP.pdf

xapp503 - SVF and XSVF formats.pdf

svf file format.pdf

Statistics: Posted by wiggy — Thu Feb 19, 2026 8:57 pm



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