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Thread: 4164/41256 DRAM (memory) chips tester for C64 and more

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    anemo's Avatar
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    Default 4164/41256 DRAM (memory) chips tester for C64 and more

    DRAMBOARD V1.2 – 4164/41256 DRAM chip tester

    Test memory chips for the C64 (breadbin) quick and easy! 8x 4164 DRAM (8x8kB) are used in older C64:s.

    Arduino Nano-based DRAM (Dynamic RAM) tester for 4164* and 41256** type DRAM chips.

    User manual: http://docs.anemo.se/dramboard-manual.pdf (right-click to save)

    Availability: 2
    board(s)


    Four loops with four memory verify tests are run:

    1. Fill with ones
    2. Fill with zeros
    3. Fill with alternating ones and zeros
    4. Fill with alternating zeros and ones


    • Test time, 4164: 40 seconds
    • Test time, 41256: 1 minute, 45 seconds

    • Duo color status LED:
    Green - Init & passed all tests
    Yellow/orange - tests running
    Red (blinking) test failed

    • Arduino current supply overcurrent protection (Polymer PTC self-resettable fuse)
    • Arduino output pins overcurrent protection (current limiting resistors, new for v1.2)
    • Serial monitor (9600 bauds)

    How to use:

    1. Select 4164 or 41256 DRAM type with header jumper on board
    2. Place DRAM chip in ZIF socket* (doublecheck chip orientation)
    3. Connect attached USB cable (or similar) between the board and computer USB port/USB charger
    4. Remove chip after finnished test (you don't have to cut power to the board)
    5. Place new chip in socket
    6. Press Arduino reset button for new test run


    *ZIF socket is open when lever is turned up and closed when lever is down


    Pre-programmed Arduino Nano (socketed) and 30 cm mini-USB cable included. DRAM chip in pictures is NOT included

    Note! 4164 chips detected as working/defective has been verified in real C64. 41256 test mode is BETA as I haven't had the opportunity to test chips from multiple manufacturers. Tests are not 100% accurate (timing wise) and should be seen as an good indication.

    PRICE & PAYMENT:

    €27.5 INCLUDING international shipping (v1.0 was €25.5)
    Payment as gift via Paypal

    Drivers for the CH340 chipset is needed for serial communication: https://sparks.gogo.co.nz/ch340.html
    - - -



    Image above shows v1.0



    *4164 DRAM cross reference:

    MB8264-15 (Fairchild)
    MB8264A-15 (Fujitsu)
    HM4864, HYB4164P2BD (Hitachi)
    M3764A-15 (OKI)
    MT4264-25 (Micron)
    M5K4164AP-15, M5K4164 ANP-10 (Mitsubishi)
    MK4564N-20 (Mostek)
    MCM4164BP15, MCM6665BP20, MCM6665AP (Motorola)
    D4164C-2, D4164C-15, uPD 4164-1 (NEC)
    KM4164B-15 (Samsung)
    TMM4164 C-3, TMS4164-15NL, TMS4164-20NL (Toshiba)


    **41256 DRAM cross reference:

    TMS4256 (Toshiba)
    MCM6256 (Motorola)
    HM51256 (Hitachi)
    MB81256 (Fujitsu)
    HYB41256 (Siemens)
    KM41256 (Samsung)
    MSM41256 (OKI)
    uPD41256 (NEC)

    The boards are also sold elsewhere!
    Last edited by anemo; 6th December 2019 at 05:42.
    A1200 | WB3.1 | 4Gb CF | ACA1233n/40+FPU | PCMCIA wifi card + C64 (-82 Breadbin) | C1541 | Pi1541

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    Tinkerer allenbailey's Avatar
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    Declaring an interest in one unit shipped to the UK.

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    Declaring an interest in one

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    Quote Originally Posted by allenbailey View Post
    Declaring an interest in one unit shipped to the UK.
    PM sent with payment info.

    - - - Updated - - -

    Quote Originally Posted by bobymiller View Post
    Declaring an interest in one
    PM sent with payment info.
    A1200 | WB3.1 | 4Gb CF | ACA1233n/40+FPU | PCMCIA wifi card + C64 (-82 Breadbin) | C1541 | Pi1541

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    Hi,
    looks like I've come too late to the party, but hopefully you'll make further batches. I have a few questions to the device:

    - Are all the pins to the DUT controlled by the Arduino or are any pins hardwired?
    - Is the source code open source.

    The reason I ask is because I'd like to expand the device to check other IC's which may have conflicting pinouts.

    Bryce.

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    Quote Originally Posted by Bryce View Post
    Hi,
    looks like I've come too late to the party, but hopefully you'll make further batches. I have a few questions to the device:

    - Are all the pins to the DUT controlled by the Arduino or are any pins hardwired?
    - Is the source code open source.

    The reason I ask is because I'd like to expand the device to check other IC's which may have conflicting pinouts.

    Bryce.
    Hi,

    I will probably make a small batch (~10-20 boards) in the near future so more boards.

    I don't have the schematics available right now but it has been inspired by similar projects found online like these: http://www.chronworks.com/DRAM/, http://forum.defence-force.org/viewtopic.php?t=1699

    The supply voltage (Vcc) and GND are hardwired on my board and I've had a few requests expanding the chip types supported but I don't have the time for it right now.

    I might release my code and schematics as open source in the near future but it have to be maintained by somebody else in that case to take it to the next level.
    A1200 | WB3.1 | 4Gb CF | ACA1233n/40+FPU | PCMCIA wifi card + C64 (-82 Breadbin) | C1541 | Pi1541

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    Amibayer! Bryce's Avatar
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    Thanks, maybe I'll look at making my own version where the supply voltage is selectable so that shorter RAM and Logic chips could be tested too.

    Bryce.

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    anemo's Avatar
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    Quote Originally Posted by Bryce View Post
    Thanks, maybe I'll look at making my own version where the supply voltage is selectable so that shorter RAM and Logic chips could be tested too.

    Bryce.
    44256 DRAM (C64C) support would probably be appreciated. But
    it's easier to test in the actual device with only two DRAM chips.
    A1200 | WB3.1 | 4Gb CF | ACA1233n/40+FPU | PCMCIA wifi card + C64 (-82 Breadbin) | C1541 | Pi1541

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    Payment received from allenbailey.
    A1200 | WB3.1 | 4Gb CF | ACA1233n/40+FPU | PCMCIA wifi card + C64 (-82 Breadbin) | C1541 | Pi1541

  10. #10
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    Payment received from bobymiller. Will ship tomorrow morning.
    A1200 | WB3.1 | 4Gb CF | ACA1233n/40+FPU | PCMCIA wifi card + C64 (-82 Breadbin) | C1541 | Pi1541

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