FlexSD drive VCPU extension

FlexSD drive: SD2IEC VCPU extension

What's this:

The goal of the Flexible SD drive firmware¹ (FlexSD fw. in short) VCPU extension is to make the SD2IEC drive capable of executing downloaded programs like the classic Commodore disk drives. SD2IEC is a drive family with different hardware. With VCPU the executed program uses a unified (virtual) hardware so separate support is no longer needed. Compatibility with existing older CBM drives is not a goal! VCPU is not limited to regular disk images, it can use all of the functions of the drive so a much larger storage becomes available to the computer than the old disk drives. In addition any data transfer protocol can be implemented to fulfill the requirements of the programmer.

(¹: FlexSD firmware is an sd2iec firmware fork. The original version can be found on the linked page.)

WARNING: USE ONLY AT YOUR OWN RISK!

Acknowledgments:

Thanks to the original sd2iec authors!
Thanks to the betatesters: Larry, Siz! Thanks for uIEC3 betatest to marcos64!

The required files are:

FlexSD 1.2.0-rc1 precompiled binaries - for regular users (compiled with gcc 13.2)
FlexSD 1.2.0-rc1 source code - for firmware programmers
FlexSD firmware changelog
Programming manual V1.2.1 - for CBM programmers
Precompiled testcodes (1.2.3) - for regular users, compiled to four platforms
Testcodes (1.2.3) sources (precompiled, without binaries) - for manual compiling
Test codes changelog

Previous versions (for the designing story, their use is not recommended):

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