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Thread: 8501 7501 CPU replacement for C16 (CPU4C16) and PLUS4 (CPU4PLUS4)

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    MCes's Avatar
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    Default 8501 7501 CPU replacement for C16 (CPU4C16) and PLUS4 (CPU4PLUS4)

    From the "85MC01" experience... http://www.amibay.com/showthread.php?106203-8501-replacement-for-C16-Plus4-work-in-progress

    A pair of replacement 7501/8501 CPUs using a 6502A* N-MOS core - they can handle illegal opcodes!

    "CPU4C16"
    :a specific CPU replacement to fit into a C16
    "CPU4PLUS4":a specific CPU replacement to fit into a PLUS4

    Tested also with "metamerism", "pets rescue",2 versions of "Elite","krill's loader", jiffydos, ......

    ..Click image for larger version. 

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    Features:
    A) normal sw N-MOS 6502 behaviour (as 8501, illegal opcode included)
    B) The I/O bits are at right places: the self-turbo routines (loaders) will work
    C) R/W line is put on 3state and HOLD like as 8501 timings spec
    D) TBC technique applied to help the CPU, even in the "worst case", to match the correct bus timings
    E) the 2 bytes ram under the CPU port will be not corrupted (on C16 they are reachable by their mirrored address)
    F) CPU4C16 only: double pin construction. The C16 CPU socket is very delicate socket, its contacts can be easily deformed,
    ---therefore"CPU4C16" is provided with a coupling socket that has thin pins to adapt to a perfect C16-CPU socket.
    ---In case of already compressed contacts the"CPU4C16" can be directly plugged with its 0.4mm pins ...
    G) (*) each 6502 (which you will already find included in the CPU replacement) are selected for 2 specs:
    ---1) it has to be an N-Mos,
    ---2) it has to match to the specifics bus timings

    Remember that N-MOS 6502 chips are discontinued,
    often on market the sold chips are refurbished and relabelled with a label different to the old one:
    chips marked as "6502" may not be N-Mos as it have to be, and vice versa (C-MOS, so no execution of the illegal opcode).
    I found a chip labelled as "W65C02S" (10MHz C-MOS) that is a 1MHz N-MOS, and some of not working chips marked as "MOS6502A" seem to be MC6809 Cpu...

    This mod will be assembled on request, also on sale elsewhere.

    The cost:
    25€+untracked shipping cost: PPal "FOR FRIENDS" (I can't be responsible for untracked shipping)
    25€+tracked shipping cost (+ eventual PPal fees if PPal "COMMERCIAL" )


    Other projects for C16 PLUS4 and combined shipping available.



    A new revision is under development:
    "CPU4...." are temporarily unavailable until further notice.
    Last edited by MCes; 26th March 2021 at 17:43. Reason: adding "CPU4PLUS4"

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    zzarko's Avatar
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    I'm interested in 2, but need to know is it possible to ship to Serbia, and if it is, what is the postage for tracked option?
    Last edited by zzarko; 10th June 2020 at 17:29.

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    MCes's Avatar
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    Quote Originally Posted by zzarko View Post
    I'm interested in 2, but need to know is it possible to ship to Serbia, and if it is, what is the postage for tracked option?
    Hi,
    tracked shipping to Serbia (as in others europe destination) will be 10€
    Have a look also at my others project for C16 (PLUS4, ....), I can combine shipping.

    Special coupled offer: 1pc "CPU4C16" + 1pc "SMD64KxC16"= 40€ 35€
    Last edited by MCes; 10th June 2020 at 21:26.

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    Inactive Member PPZ's Avatar
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    Is it installable in Plus/4 or it's C16 only?

    Послато са Mi 9 Lite помоћу Тапатока

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    MCes's Avatar
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    Quote Originally Posted by PPZ View Post
    Is it installable in Plus/4 or it's C16 only?

    Послато са Mi 9 Lite помоћу Тапатока
    This solution is mechanically specific for C16 only, for PLUS4 I can propose 85MC01
    http://www.amibay.com/showthread.php...plus4-(85MC01)
    Last edited by MCes; 12th June 2020 at 06:47.

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    Quote Originally Posted by MCes View Post
    Quote Originally Posted by zzarko View Post
    I'm interested in 2, but need to know is it possible to ship to Serbia, and if it is, what is the postage for tracked option?
    Hi,
    tracked shipping to Serbia (as in others europe destination) will be 10€
    Have a look also at my others project for C16 (PLUS4, ....), I can combine shipping.

    Special coupled offer: 1pc "CPU4C16" + 1pc "SMD64KxC16"= 40€ 35€


    Money received for
    1x coupled offer (1pc "CPU4C16" + 1pc "SMD64KxC16")
    1x additional "CPU4C16"
    2x N-Mos ROMs (C16: basic, kernal_PAL) low power replacement
    1x gift
    Last edited by MCes; 15th June 2020 at 08:02.

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    Inactive Member kikems's Avatar
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    What about compatibility?, my personal experience with your old 85MC01 was no good, most demos, actual homebrew, and 90th homebrew fail maybe because most of them use illegal opcodes.
    I'm consider your 85MC01 as little best solution than 6510 adapters, specially for use with old commercial games of C16 era ( most of them not use ilegal opcodes ), but not good for homebrew or 64kb ram production, because most of the use illegal opcodes.

    1- This new solution works good for example with Elite+4, Total Eclipse II, Sgt Helmet, Zombi, Gunfright, Knight Lore, Head Over Heels, Hazian Demo, Zennit Demo, Dream Time 2K17 and 2k18 demo ?
    2- The CPU is included in the price ?
    3- This solution can works at 2 Mhz for games like Elite ?

    If answers are yes, please I need one unit with shipping cost to Spain.

    Thanks in advance for your work and your products at reasonable prices.

    Why not works on Plus4?
    Last edited by kikems; 19th June 2020 at 17:56.

  8. #8
    MCes's Avatar
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    Quote Originally Posted by MCes View Post
    Quote Originally Posted by MCes View Post
    Quote Originally Posted by zzarko View Post
    I'm interested in 2, but need to know is it possible to ship to Serbia, and if it is, what is the postage for tracked option?
    Hi,
    tracked shipping to Serbia (as in others europe destination) will be 10€
    Have a look also at my others project for C16 (PLUS4, ....), I can combine shipping.

    Special coupled offer: 1pc "CPU4C16" + 1pc "SMD64KxC16"= 40€ 35€


    Money received for
    1x coupled offer (1pc "CPU4C16" + 1pc "SMD64KxC16")
    1x additional "CPU4C16"
    2x N-Mos ROMs (C16: basic, kernal_PAL) low power replacement
    1x gift

    shipped!

    - - - Updated - - -

    Quote Originally Posted by kikems View Post
    What about compatibility?, (...)
    I'm consider your 85MC01 (..) for use with old commercial games of C16 era ( most of them not use ilegal opcodes ), but not good for homebrew or 64kb ram production, because most of the use illegal opcodes.
    Exactly the use-target and the limits explained in 85MC01 thread.

    Quote Originally Posted by kikems View Post
    1- This new solution works good for example with Elite+4, Total Eclipse II, Sgt Helmet, Zombi, Gunfright, Knight Lore, Head Over Heels, Hazian Demo, Zennit Demo, Dream Time 2K17 and 2k18 demo ?
    Read the starting post: there is no reasons for sw incompatibilities, also the illegal opcode is well executed.
    I found 2 versions of "Elite", both of them work (see new pics into starting post), if you want that I test it with another pair of sw please PM me a link for downloading them.
    Quote Originally Posted by kikems View Post
    2- The CPU is included in the price ?
    Yes. it is

    Quote Originally Posted by kikems View Post
    3- This solution can works at 2 Mhz for games like Elite ?
    Elite: Already answered (Also during the raster border-time the CPU run always at double frequency)

    Quote Originally Posted by kikems View Post
    If answers are yes, please I need one unit with shipping cost to Spain.

    Thanks in advance for your work and your products at reasonable prices.

    Why not works on Plus4?
    tracked shipping to Spain (as in others europe destination) will be 10,
    CPU4C16 can't be used on PLUS4 exclusively because mechanically it can't be fitted inside the free space of the motherboard (its shape is developed for fitting the C16 motherboard)
    Last edited by MCes; 20th June 2020 at 18:42.

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    breadboxer's Avatar
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    I'm interested in one CPU4C16 - pm sent!

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    zzarko's Avatar
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    Package received, thanks MCes!

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