# How to use CHESTER-X0A installed on "B" slot

**URL:** <https://forum.hardwario.com/t/how-to-use-chester-x0a-installed-on-b-slot/802>\
**Category:** CHESTER\
**Created:** [May 13, 2024, 5:47pm UTC](https://forum.hardwario.com/t/how-to-use-chester-x0a-installed-on-b-slot/802 "2024-05-13T17:47:44Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![david.santoso](https://forum.hardwario.com/letter_avatar_proxy/v4/letter/d/958977/32.png) [@david.santoso](https://forum.hardwario.com/u/david.santoso)\
**Post date:** [May 13, 2024, 5:47pm UTC](https://forum.hardwario.com/t/how-to-use-chester-x0a-installed-on-b-slot/802/1 "2024-05-13T17:47:44Z")

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Hi,

I was able to use CHESTER-X0A which was installed on “A” slot, but having problem when it is installed on “B” slot. Could you please let me know what changes need to be made?

Btw, I assume the “ctr\_x0\_a” below indicates CHESTER-X0A, and not the “A” slot, correct?

static const struct device \*dev = DEVICE\_DT\_GET(DT\_NODELABEL(ctr\_x0\_a));

Best,  
David

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**Author:** ![hub.martin](https://forum.hardwario.com/user_avatar/forum.hardwario.com/hub.martin/32/631_2.png) [@hub.martin](https://forum.hardwario.com/u/hub.martin)\
**Post date:** [May 15, 2024, 7:24am UTC](https://forum.hardwario.com/t/how-to-use-chester-x0a-installed-on-b-slot/802/2 "2024-05-15T07:24:18Z")

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Hi David,

the suffix is really the slot. I answered similar question in a similar post here.

> [@Which board A or B](https://forum.hardwario.com/t/which-board-a-or-b/804):
>
> How do you tell the software that a particular board is in slot A or slot B?

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<div class="post-metadata">

**Author:** ![david.santoso](https://forum.hardwario.com/letter_avatar_proxy/v4/letter/d/958977/32.png) [@david.santoso](https://forum.hardwario.com/u/david.santoso)\
**Post date:** [May 15, 2024, 2:30pm UTC](https://forum.hardwario.com/t/how-to-use-chester-x0a-installed-on-b-slot/802/3 "2024-05-15T14:30:08Z")

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Thanks Martin!

Best,  
David