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http://www.e-basteln.de/computing/65f02/65f02/
The 6502 was the CPU in my first computer (an Apple II plus), as well as many other popular home computers of the late 1970s and 80s. It lived on well into the 1990s in game consoles and chess computers, mostly in its updated “65C02” CMOS version. Here’s a re-implementation of the 65C02 in an FPGA, in a pin-compatible format that lets you upgrade those old computers and games to 100 MHz clock rate!
The concept
The idea of implementing a CPU core inside an FPGA is not new, of course. In fact, the CPU core I am using is not my own, but was developed as a 6502 core by Arlet Ottens, and extended to cover the 65C02 opcodes by Ed Spittles and David Banks. A big thank-you to Arlet, Ed, and Dave for developing the core and sharing it freely! Links to their original work are on the Files & Links page.
(Score: 2) by dltaylor on Thursday October 14 2021, @02:55AM (1 child)
Compaq made a PC-equivalent with a faster 8086 (2X memory bandwidth, faster clock). It had a button to cripple it so it ran as badly as an IBM PC or XT.
I put NEC chips in every 8088/8086 PC I was forced to use (didn't build one until the AMD K5 PR100), as well as in my Amiga Bridgeboard (best MS-DOS machine I ever used).
(Score: 0) by Anonymous Coward on Thursday October 14 2021, @03:30AM
I benchmarked MessyDos on my Amiga. On a 7MHz 68000, it emulated a 33MHz '86 machine.