# Clarification on Max Rows and Columns **URL:** \ **Category:** Uncategorized\ **Created:** [April 21, 2025, 12:54am UTC](https://rpi-rgb-led-matrix.discourse.group/t/clarification-on-max-rows-and-columns/1061 "2025-04-21T00:54:23Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![lesterd88](https://avatars.discourse-cdn.com/v4/letter/l/ee59a6/32.png) [@lesterd88](https://rpi-rgb-led-matrix.discourse.group/u/lesterd88)\ **Post date:** [April 21, 2025, 12:54am UTC](https://rpi-rgb-led-matrix.discourse.group/t/clarification-on-max-rows-and-columns/1061/1 "2025-04-21T00:54:24Z")
I’ve had confilcting info on this so I’m going to the experts. Forgive my naivety this is all brand new to me. I’m working on a project for a home scoring pylon, and I’m working up the code so I can validate the solution code using a simulated output to a web server. However I’m getting this right now when starting my app: Invalid number or rows per panel (–led-rows). Should be in range of [8..64] and divisible by 2. I read the readme page that says the system will support up to 64 rows, but then I’ve seen people talking about how they got theirs running with more than that so long as its an even number. My panels are 180\*80 (when they come in) so that’s how I have things configured. But obviously the software doesn’t like that. What am I doing wrong? ---
**Author:** ![board707](https://avatars.discourse-cdn.com/v4/letter/b/bc79bd/32.png) [@board707](https://rpi-rgb-led-matrix.discourse.group/u/board707)\ **Post date:** [April 21, 2025, 7:58am UTC](https://rpi-rgb-led-matrix.discourse.group/t/clarification-on-max-rows-and-columns/1061/2 "2025-04-21T07:58:41Z")
> [@lesterd88](#): > > My panels are 180\*80 Could you please show a clear photo of the panel rear side? Also a link to the panel purchase could be usefull ---
**Author:** ![lesterd88](https://avatars.discourse-cdn.com/v4/letter/l/ee59a6/32.png) [@lesterd88](https://rpi-rgb-led-matrix.discourse.group/u/lesterd88)\ **Post date:** [April 22, 2025, 1:52am UTC](https://rpi-rgb-led-matrix.discourse.group/t/clarification-on-max-rows-and-columns/1061/3 "2025-04-22T01:52:23Z")
I haven’t recieved the panels, but in late night research I ended up cancelling the originals and going with these from AliExpress: [https://www.aliexpress.us/item/3256807380219768.html?spm=a2g0o.order\_list.order\_list\_main.10.6a9018023dIh7e&gatewayAdapt=glo2usa](https://www.aliexpress.us/item/3256807380219768.html?spm=a2g0o.order_list.order_list_main.10.6a9018023dIh7e&gatewayAdapt=glo2usa) So they’re 128\*64. However in the code I’m prebuilding I get the same error as before. ---
**Author:** ![board707](https://avatars.discourse-cdn.com/v4/letter/b/bc79bd/32.png) [@board707](https://rpi-rgb-led-matrix.discourse.group/u/board707)\ **Post date:** [April 22, 2025, 6:01am UTC](https://rpi-rgb-led-matrix.discourse.group/t/clarification-on-max-rows-and-columns/1061/4 "2025-04-22T06:01:53Z")
> [@lesterd88](#): > > However in the code I’m prebuilding What’s the code? > [@lesterd88](#): > > I get the same error as before. please show the command line with options which you tried to run PS Your Aliexpress lot doesn’t contain a detailed panels description. I would like to point out that ordering panels without knowing the type of chips on them is a big risk. There are currently a lot of led drivers that require a special code to work. If such a panel arrives, you will not be able to run it at all. ---
**Author:** ![marcmerlin](https://yyz2.discourse-cdn.com/free1/user_avatar/rpi-rgb-led-matrix.discourse.group/marcmerlin/32/40_2.png) [@marcmerlin](https://rpi-rgb-led-matrix.discourse.group/u/marcmerlin)\ **Post date:** [April 25, 2025, 5:43am UTC](https://rpi-rgb-led-matrix.discourse.group/t/clarification-on-max-rows-and-columns/1061/5 "2025-04-25T05:43:42Z")
The code wasn’t designed for some of the weird resolutions that exist today. If I had your panels, I would configure as if the real resolution were 192x96. But honestly with 5 address lines (ABCDE), you can only control 64 lines, so if you have 80 lines in a single panel, how will line addressing even work? Long story short, it’s not a supported size at all and beyond the maximum number of lines currently supported (64), so I’m not sure they can work ---
**Author:** ![board707](https://avatars.discourse-cdn.com/v4/letter/b/bc79bd/32.png) [@board707](https://rpi-rgb-led-matrix.discourse.group/u/board707)\ **Post date:** [April 25, 2025, 8:25am UTC](https://rpi-rgb-led-matrix.discourse.group/t/clarification-on-max-rows-and-columns/1061/6 "2025-04-25T08:25:23Z")
@marcmerlin According to the message #3, OP’s panel size is 128\*64 ---
**Author:** ![marcmerlin](https://yyz2.discourse-cdn.com/free1/user_avatar/rpi-rgb-led-matrix.discourse.group/marcmerlin/32/40_2.png) [@marcmerlin](https://rpi-rgb-led-matrix.discourse.group/u/marcmerlin)\ **Post date:** [April 26, 2025, 5:08am UTC](https://rpi-rgb-led-matrix.discourse.group/t/clarification-on-max-rows-and-columns/1061/7 "2025-04-26T05:08:31Z")
oops, I missed that. @lesterd88 what command line are you typing, and what error are you getting? 128x64 is well supported, I’ve been using it for years