# Memory for Code space is only 121KByte

**URL:** <https://forum.arduino.cc/t/memory-for-code-space-is-only-121kbyte/1312959>\
**Category:** PLC IDE\
**Created:** [October 19, 2024, 11:19am UTC](https://forum.arduino.cc/t/memory-for-code-space-is-only-121kbyte/1312959 "2024-10-19T11:19:52Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![globetrotter79](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/globetrotter79/32/1098820_2.png) [@globetrotter79](https://forum.arduino.cc/u/globetrotter79)\
**Post date:** [October 19, 2024, 11:19am UTC](https://forum.arduino.cc/t/memory-for-code-space-is-only-121kbyte/1312959/1 "2024-10-19T11:19:52Z")

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I can see that with Portenta based microcontroller (Machine Control or OPTA) , the maximum code space it 121KByte.

Why is it so small compared to the available 16MB onboard flah QSPI memory, 2MB Flash and 1MB Ram and additional 8MB SDRAM ?

I do not understand why there is such gap between code space and onboard memory available.

Is it a limitation of PLC IDE ?

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**Author:** ![chetto983](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/chetto983/32/215008_2.png) [@chetto983](https://forum.arduino.cc/u/chetto983)\
**Post date:** [November 6, 2024, 3:50pm UTC](https://forum.arduino.cc/t/memory-for-code-space-is-only-121kbyte/1312959/4 "2024-11-06T15:50:53Z")

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No, this is the space Arduino dedicate to Axel runtime.