Slimline gotek drive hardware configuration

Jeff
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Re: Slimline gotek drive hardware configuration

Post by Jeff » Wed May 22, 2019 9:35 pm

mikeyp wrote:
Tue May 21, 2019 8:17 pm
Hi Jeff

I've just swapped in the OLED display which as you can see works flawlessly, however it does cause an odd issue, once initialised the red error LED stays on constantly. The green access LED works as normal.
IMG_1900.jpg
If I swap back in the 7 segment display, it works normally, off most of the time and lighting red when I press a button etc.
IMG_1901.jpg
Is this a bug in the firmware or something the OLED is causing?

Thanks again

Michael
Not a software bug, but a strange thing in the gotek hw design : the "error led" is mounted as pull up on one of the screen i2c bus signal.
Since the oled is constantly updated, the red led is lit constantly too.

mikeyp
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Re: Slimline gotek drive hardware configuration

Post by mikeyp » Wed May 22, 2019 10:42 pm

Ooh ok. That is odd. I presume it's safe on this model to remove the red LED then? Some 34 pin models don't seem to have it. I have one with it but folded back internally and two without.

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Re: Slimline gotek drive hardware configuration

Post by Jeff » Wed May 22, 2019 10:58 pm

mikeyp wrote:
Wed May 22, 2019 10:42 pm
Ooh ok. That is odd. I presume it's safe to remove the red LED then?
not sure : if you remove this led, this also remove the pull up.
you may need to replace it with a 1Kohms resistor.

mikeyp
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Re: Slimline gotek drive hardware configuration

Post by mikeyp » Wed May 22, 2019 11:10 pm

Jeff wrote:
Wed May 22, 2019 10:58 pm
not sure : if you remove this led, this also remove the pull up.
you may need to replace it with a 1Kohms resistor.
R21 is already 1K to the common anode of the LED. Are you suggesting bridging it with another 1K resitor or just relying on the existing 1K resistor?

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Re: Slimline gotek drive hardware configuration

Post by Jeff » Wed May 22, 2019 11:47 pm

mikeyp wrote:
Wed May 22, 2019 11:10 pm
Jeff wrote:
Wed May 22, 2019 10:58 pm
not sure : if you remove this led, this also remove the pull up.
you may need to replace it with a 1Kohms resistor.
R21 is already 1K to the common anode of the LED. Are you suggesting bridging it with another 1K resitor or just relying on the existing 1K resistor?
i recommend to bridge it with another 1K resistor. the r21 is common to both leds.

mikeyp
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Re: Slimline gotek drive hardware configuration

Post by mikeyp » Fri May 24, 2019 12:00 am

Jeff wrote:
Wed May 22, 2019 11:47 pm
i recommend to bridge it with another 1K resistor. the r21 is common to both leds.
I de-soldered the red leg of the LED and bridged the connections with a 1K resistor as you suggested. This seems to work just fine. I didn't try it without.

This is the completed unit with OLED screen. I've left the leg floating in case I wish to reconnect it in future. There's no risk of it touching anything. I've also re-removed resistor RA so I don't need custom firmware.
IMG_1915.jpg
IMG_1915.jpg (126.45 KiB) Viewed 1175 times
Here's the finished unit next to an unmodified floppy drive version. All I need now is to find some suitable grey plastic, cut to size and cut the holes and fit it to blend in and keep the original aesthetic.
IMG_1933.JPG
IMG_1933.JPG (91.98 KiB) Viewed 1175 times
Lastly, I have reverted to a standard "Normal" config file but have used the menu on the drive to set the function of pins 2 and 34 to nDiskChange1 and nReady respectively. This way I don't need to change the config file when I take the memory stick back to the standard 34-pin gotek drives.

I also came across the issue where the files aren't in alphabetical order in normal mode because it's an embedded system which puts them in FAT table order but found this thread which fixed the issue. viewtopic.php?f=33&t=3072&p=17386&hilit ... der#p17386

Thank you for your help Jeff and I hope others find this thread useful too.

Jeff
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Re: Slimline gotek drive hardware configuration

Post by Jeff » Sat May 25, 2019 8:29 am

mikeyp wrote:
Fri May 24, 2019 12:00 am
I also came across the issue where the files aren't in alphabetical order in normal mode because it's an embedded system which puts them in FAT table order but found this thread which fixed the issue. viewtopic.php?f=33&t=3072&p=17386&hilit ... der#p17386
Anyway i will try to add an automatic files sorting in a next fw version.

mikeyp
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Re: Slimline gotek drive hardware configuration

Post by mikeyp » Sat May 25, 2019 8:16 pm

Thank you. That would be a good feature.

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Re: Slimline gotek drive hardware configuration

Post by Jeff » Fri Jun 28, 2019 11:04 am

mikeyp wrote:
Sat May 25, 2019 8:16 pm
Thank you. That would be a good feature.
Done ! :
viewtopic.php?f=33&t=3147&p=20611#p20611

mikeyp
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Re: Slimline gotek drive hardware configuration

Post by mikeyp » Fri Aug 09, 2019 8:34 pm

Hi Jeff. Thank you for this! It seems to work really well!

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