No display and weird sounds from MIDIBOX SID v1

[dott.benway]

Hi all,

I'm trying to resurrect a old MIDIBOX SID that I have built for an eurorack modular synth project.

My setup is composed by the following:

1 16x2 LCD display GDM1602B Xiamen ocular

1 mbhp core  made by smashTV  running PIC18F452 BSL V1.2B MIOS V1.9E

1 SID board made by smashTV ,  8580 is installed

the application is setup_8580_without_cs.hex

In past the system was working perfectly but the cable connections where unstable, so I have decided to rewire It.

After the rewiring I have double checked all the connections but the system doesn't work anymore.

I have also checked all the voltages .

the synthoms are the following:

1) the display is blank (no messages, only a solid rectangle at the system boot)

2) after the system boot the SID is generating a loop of 4 notes like an "alarm tone"

3) Sending a Query in MIOS studio stops  the "alarm tone" with the following message:

Operating System: MIOS8
Board: MBHP_CORE or similar
Core Family: PIC18F
Application is up & running

4) Sending notes in MIOS studio results only in audible "CLICKS"

Have you any suggestions about?

Any hint would be very appreciated.

Thanks,

B.R.

Giorgio.

 

 

 

[dott.benway]

Hi All,

a little update.

I have removed a short circuit in the display connector.

Now the weird alarm sound is gone and the SID module is up and running.

Unfortunately the LCD display doesn't work. Maybe I have damaged a GPIO of the PIC.

B.R.

Giorgio.

 

[Antichambre]

On 6/24/2022 at 9:10 PM, dott.benway said:

the application is setup_8580_without_cs.hex

If I remember well display is part of the CS, so it will not initialize with the firmware you use.
But maybe I'm wrong.
BR
Bruno