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Recovering the engineering behind the 6502 — Parallax Forums

Recovering the engineering behind the 6502

potatoheadpotatohead Posts: 10,261
edited 2011-06-20 13:02 in General Discussion
http://www.archaeology.org/1107/features/mos_technology_6502_computer_chip_cpu.html

Interesting comments in this article about various de-capping techniques used to photograph chips for reverse engineering. Other comments about the age of designing that way are times gone by. Made me think about Chip and the Prop I, and what is coming for Prop II.

Finally, the idea that we will have access to our digital history is put into relevant question. Nice take, IMHO, and from the last people I would have expected to be writing commentary on something so young as micro-processors are.

Comments

  • HollyMinkowskiHollyMinkowski Posts: 1,398
    edited 2011-06-19 20:44
    That website is so cool!
    http://www.visual6502.org/JSSim/index.html

    Thanks for posting this.
  • John A. ZoidbergJohn A. Zoidberg Posts: 514
    edited 2011-06-19 21:23
    Eventhough I haven't get to see or to use the real 6502, but the development of the system is amazing! :)
  • LeonLeon Posts: 7,620
    edited 2011-06-19 21:42
    Here is a 6502 implemented in VHDL that could be put into an FPGA:

    http://opencores.org/project,cpu6502_true_cycle
  • jazzedjazzed Posts: 11,803
    edited 2011-06-19 22:00
    I *excavated* my lost 6502 book the other day :)
  • potatoheadpotatohead Posts: 10,261
    edited 2011-06-19 22:15
    I've still got mine, and the 6809 one. :)

    @Holly: Totally. I spent some time running a few small programs through it. Very cool.
  • TonyDTonyD Posts: 210
    edited 2011-06-20 01:26
    Cool, I learnt machine code on the 6502 using a EMMA trainer board in the early 80's and then assembly language on a 6809 co-processor for the BBC micro. Which is strange because at the time I own a Sinclair ZX Spectrum which as a Z80 machine :)
  • ctwardellctwardell Posts: 1,716
    edited 2011-06-20 05:39
    I might have to dust of my AIM 65...
  • Oldbitcollector (Jeff)Oldbitcollector (Jeff) Posts: 8,091
    edited 2011-06-20 08:51
    This is slightly off-topic: but those who are interested in both 6502 and the Propeller should take a look.

    OBC
  • davidsaundersdavidsaunders Posts: 1,559
    edited 2011-06-20 09:29
    Kool article. There is a schematic of the 6502 in one of the Apple II documentation FTP archives, I do not remember which one at the moment. The 6502 got me into computers as a young child, and got me into breadboarding in Jr. high, and still to this day I play with 6502, 6510, and 65816 MPUs all the time. It is possible to over clock the current W65C02S, and W65C816S to up to 50Mhz with out any problem, they are both rated at 14MHz. The 65C02/65C816 is one MPU series that has proven that it will not die (I hope the same is true for the Prop).
  • jazzedjazzed Posts: 11,803
    edited 2011-06-20 10:41
    Oldbitcollector (Jeff) wrote: »
    This is slightly off-topic: but those who are interested in both 6502 and the Propeller should take a look.

    OBC
    That's way cool. I'll probably get one of those at some point.

    Just one question: Any reason the designer doesn't care to participate in this forum?
  • LeonLeon Posts: 7,620
    edited 2011-06-20 11:39
    Here is a C64 implemented on an FPGA:

    http://www.syntiac.com/fpga64.html
  • Oldbitcollector (Jeff)Oldbitcollector (Jeff) Posts: 8,091
    edited 2011-06-20 13:02
    jazzed wrote: »
    Just one question: Any reason the designer doesn't care to participate in this forum?

    You'll have to ask them.. Savagecircuits tends to be a little slower, more low key forum, so maybe it's preference.

    OBC
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