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, Informative) by Acabatag on Thursday October 14 2021, @11:06PM
You had to buy it seperately, but the IBM PC had a published Tehnical Reference Manual with full schematics. That included the schematics of the floppy drive and power supply. Plus it has the commented source code for the BIOS. I have the same material for a number of other machines of that era, including the Compaq Deskpro 386 and the AT&T 6300. I think I remember that the 6300 techref has the schematic for the hard drive.
IBM didn't keep secrets about the PC.