# Extensions

**URL:** https://forum.cpcwiki.eu/c/cpc-hardware/extensions/26.md

[Latest](https://forum.cpcwiki.eu/latest.md) · [Categories](https://forum.cpcwiki.eu/categories.md) · [Tags](https://forum.cpcwiki.eu/tags.md)

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## [About the Extensions category](https://forum.cpcwiki.eu/t/about-the-extensions-category/700)

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**Author:** [@Gryzor](https://forum.cpcwiki.eu/u/Gryzor)\
**Replies:** 0\
**Last updated:** [October 6, 2026, 10:07am UTC](https://forum.cpcwiki.eu/t/about-the-extensions-category/700 "2026-10-06T10:07:22Z")

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Discussions concerning hardware extensions. Pretty simple.

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## [ULIfAC & USIfAC II, technical problems & support](https://forum.cpcwiki.eu/t/ulifac-usifac-ii-technical-problems-support/806)

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**Author:** [@ikonsgr](https://forum.cpcwiki.eu/u/ikonsgr)\
**Replies:** 0\
**Last updated:** [October 12, 2026, 9:12am UTC](https://forum.cpcwiki.eu/t/ulifac-usifac-ii-technical-problems-support/806 "2026-10-12T09:12:41Z")

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(This is a reincarnation from the old CPCWiKi forum ) This thread is created to dealt with technical problems or issues anyone might have, with the ULIfAC and USIfAC II boards. That way, it will be much faster & easier…

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## [M4 Firmware source?](https://forum.cpcwiki.eu/t/m4-firmware-source/733)

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**Author:** [@reno08](https://forum.cpcwiki.eu/u/reno08)\
**Replies:** 3\
**Last updated:** [October 11, 2026, 7:37pm UTC](https://forum.cpcwiki.eu/t/m4-firmware-source/733 "2026-10-11T19:37:44Z")

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Hi, I was looking for the M4 firmware source code on Duke’s Github but couldn’t find it. I know that when he stopped the project he open sourced the Gerber files, and there’s also the M4 ROM Z80 asm source on his Githu…

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## [Looking for a user that was active in the old forums last in 2024: madlax39](https://forum.cpcwiki.eu/t/looking-for-a-user-that-was-active-in-the-old-forums-last-in-2024-madlax39/726)

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**Author:** [@salvogendut](https://forum.cpcwiki.eu/u/salvogendut)\
**Replies:** 0\
**Last updated:** [October 7, 2026, 9:40am UTC](https://forum.cpcwiki.eu/t/looking-for-a-user-that-was-active-in-the-old-forums-last-in-2024-madlax39/726 "2026-10-07T09:40:19Z")

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Anyone knows or has seen a user: madlax39 ? They made an improved version of the original USIFAC with KiCad files (you can see the old posts here Universal Serial Interface for Amstrad CPC (a.k.a USIfAC) - Page 12 The…

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## [Ulifac v6 with CPC464 and VR40007](https://forum.cpcwiki.eu/t/ulifac-v6-with-cpc464-and-vr40007/584)

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**Author:** [@acsi](https://forum.cpcwiki.eu/u/acsi)\
**Replies:** 4\
**Last updated:** [October 7, 2026, 8:02am UTC](https://forum.cpcwiki.eu/t/ulifac-v6-with-cpc464-and-vr40007/584 "2026-10-07T08:02:29Z")

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Hi I have recently repaired a CPC464 board where several chips had been fried. The board is now passing diagnostic tests and loads fine from tape however I purchased a Ulifac to go with it but am having issues. The VR4…