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Heading says it all. I have a Spectrum +3 (with +3e ROMs if that makes any difference) with a DivMMC SD card interface.

This works fine in +3e mode, but as I like to use the +3 with CP/M plus (Original Amstrad/Locomotive) are there any CP/M drivers available to use the DivMMC as a drive C:?

Or are there any technical reasons why this wouldn't be possible?

This video (no longer present) seems to imply it's possible with a DivIDE, at least. Unfortunately, there is no further explanation on that.

  • I'm not 100% sure about this, but my recollection is that the CP/M version Amstrad used had its drivers integrated with the build, so there wasn't any opportunity to add them later. Undoubtedly a hacked version could be produced, but honestly you'd probably find it easier starting with one of the various commented CP/M source versions. Adding drivers for the standard Spectrum hardware would probably be easier than identifying extension points in a binary build. – Jules Dec 31 '17 at 0:14
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    ZX Spectrum CP/M Plus supports FIDs (Field istallable device drivers) that can plug into the system at run time. There's no need to start from scratch. – tofro Dec 31 '17 at 11:28
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Yes, there is an experimental FID driver written by the same guy (Otivax) that made the DivIDE version. This thread tells all the story about it. He uses a loader that is fired from a +3E environment. The loader loads some CP/M system files in memory, initializes the memory arrangement suitable for CP/M, patches those system files, and finally, it inits CP/M which in turn loads the FID driver, but from the SD card, not the floppy. http://www.va-de-retro.com/foros/viewtopic.php?f=62&t=5605

  • Hey, that's great, thanks! Are there any other sources than this forum link? The attached files seem to lead into nowhere, or rather "That attachment doesn't exist any more" – tofro Apr 18 '18 at 16:02
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    I will try to gather more information about this solution and will copy here – mcleod_ideafix Apr 18 '18 at 16:12
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    @mcleod_ideafix You could try asking the person who posted it whether they still have a copy, using the PM feature of the forum? Or perhaps contact the forum owners and see if they have a copy still? There's a sizeable bounty up for grabs! – wizzwizz4 Dec 19 '18 at 21:26

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