This fix for a common Mac SE/30 problem is GENIUS (Patreon)

If you have a Mac SE/30 with a dodgy ROM SIMM slot, this option from Kero's Mac Mods is right up your alley.

The version on YouTube is here: https://youtu.be/7N--GGi32Yw

The SMC PDS ROM is available here: https://en.infinityproducts.co.jp/product-page/smc-pds-rom-card

Other links:
ROMmate SIMM programmer: https://ko-fi.com/caymacvintage/shop (availability varies)
3D-printable ROM SIMM clips: https://www.printables.com/model/35592-macintosh-se30-rom-clips

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Music by Epidemic Sound (https://www.epidemicsound.com).
Intro music by Dan Mason (https://danmason.bandcamp.com) based on elements by BoxCat Games (https://freemusicarchive.org/music/BoxCat_Games).