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Re: Microdrive
Posted: Wed Aug 12, 2015 4:40 pm
by MIST
The arm is doing all the usb stuff and controls the on screen display. If you use ps2 keyboards and mice and map the menu options to physical buttons and switches and load the rom and a mdv image into flash then you don't need the arm anymore.
Re: Microdrive
Posted: Tue Aug 18, 2015 8:01 pm
by MIST
Martin_Head wrote:
2. The Qemulator .mdv image files (size varies). This comprises of a special header, followed by Sector zero, then the highest good sector, followed by sectors counting down to sector 1. There are no preambles or checksums for the blocks.
Please tell me the details of this format. I'd like to convert this into the qlay format.
Re: Microdrive
Posted: Tue Aug 18, 2015 9:33 pm
by MIST
Nevermind. It wasn't too hard to guess. Attached is a quick hack for a qemu2qlay converter that runs on a Linux PC.
Re: Microdrive
Posted: Sun Feb 11, 2024 11:03 pm
by XorA
As I found this thread had the final little bits of MDV info I needed to implement write support in my sQLay3 emulator I thought I would revive it.
Based on the MiST source, Minerva source and details in this thread I have implemented read/write support for MDV files by emulating the hardware and not trapping the ROM calls.
https://github.com/xXorAa/sQ68Lay
The relevant source file for quick access is src/qlay_io.c which started as a port of the qlay2 file, but I could not make head nor tail of the MDV state machine in that.
One gotcha I found is JS and Minerva use different timing constants for write *grumble grumble*