SwinSID ATMEGA88

Es gibt 519 Antworten in diesem Thema, welches 261.848 mal aufgerufen wurde. Der letzte Beitrag (12. April 2024 um 15:26) ist von 1570.

  • I used this Fuse settings:

    Low = 0xF0

    High = 0xDF

    Ext = 0xF9

    from this Post from kinzi ... Bitte melde dich an, um diesen Link zu sehen.

    ...and this is the Firmware I used: Bitte melde dich an, um diesen Anhang zu sehen.

  • Die Posts von Snocksman habe ich auf seinen Wunsch in einen anderen Thread exportiert:

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  • FInaly the parts arrived, assembled ....

    But have no picture when I plug it in ....

    Used the no patch firmware, set fuses

    Low = 0xF0

    High = 0xDF

    Ext = 0xF9

    THe led on borad is ON, have a noisy sound on power up, but no pic ....

    HAve an 8580 in my C64 so I jumpered J2 only ...

    Advices

  • HiResPic of the populated SID? Maybe ab short on the adress or databus.

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  • Tryed with 1 SID from kinzi and this one works with same firmware, and same fuse settings ...

    Even the 4 SID from kinzi works (at lease I have a pic) but without sound, don't know where should the wires from J3 and J1 go ....

  • Just connect VCC, GND and AUDIO_OUT.

    Flash a firmware with "power on ping".

    Listen if it pings at power up.

    If it doesn't, something is wrong with it.

    Changing the osc to a 20 MHz one might give a hint.

    The have been reportings here that newer lots of ATmega88s do not like overclocking to 32 MHz.

  • Nope, even don't work with 25Mhz ...

    DOn't have any lower OSC ...

    I have to admit that when I turn the C64 on, I have a noise sound all the time, but still no pic ...

    kinzi Could you please guide me how to try to connect the 4 SID board

  • See Readme ...

    • Plug into SID socket.
    • Connect Address Lines according to desired address ranges:

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      Use A5 and A8 if you have no special desires. This will lead to 4 SIDs at D400, D420, D500, D520.
    • If you wanna route Audio thru the 64, jumper all four SIDs to "L" audio channel (J4, J5, J6, J7) and close "onbd" Jumper.
  • OK; I have found the A5 and A8 on the CPU, connected them with fast pin headers ...

    But still don't have any sound ....

    All 4 SID's put to L, and the onboard jumper is set on ...

    DO I have to get a sound even if I don't connect the A5 and A8 ????

  • DO I have to get a sound even if I don't connect the A5 and A8 ????

    Yes.

    Instead of connecting address bus pins, you can pulk the address input pins to GND. This wil permanently select the first SwinSID:

  • 74HC138 is not the right part. It may or may not be your problem, though. You should use LS, or maybe HCT.

    Also, I am not sure what an ATMEGA88PA-U is... I've seen PA-PU and they work. You could just have fake or wrong chips?

    However, no picture? You have some other wiring issue here, I would think. Try it with no ATMEGAs in the sockets.

    --

    Peter Rittwage

    C64 Preservation Project

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    NIBTools

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    3 Mal editiert, zuletzt von r.cade (16. März 2024 um 18:48)

  • Changed the 138 from HC to LS ... still nothing ...

    Strange that the single SID works, but this 4 SID not, even not on single chanel ...

    Can the nanoSID be programmed per fuse to set the internal OSC ??? AND SHOULD IT WORK ???

  • You double check your resistor values and placement?

    --

    Peter Rittwage

    C64 Preservation Project

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    NIBTools

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  • Depends on your device, it seems ...

    Max clock frequency for the ATmega88PA according to this datasheet is 16 MHz.

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    Page 270, 321

    Max clock frequency for the ATmega88PA according to this datasheet is 20 MHz.

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    Page 312, 631

    ATmega88PA-U is totally unknown to the datasheets (missing case designating character after the dash).