8bits4ever’s FDC-600 floppy disk

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Por OeiOeiVogeltje

Paragon (1406)

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12-02-2016, 23:54

found this in my Facebook feed

looks like an awesome thingy!!!

http://www.lavandeira.net/2016/02/review-8bits4evers-fdc-600...

Login sesión o register para postear comentarios

Por sniper22477

Master (248)

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13-02-2016, 18:18

Thanks a lot .....

You mentioned in your link:
"As I mentioned before, it’s important to make sure that the 34-pin cable connector doesn’t have the small plastic tab at the top"

This my issue .... "the small plastic tab at the top" .... now ... everything is perfect.

Thanks a lot ... really ... this is an amazing post... and marvelous link.

Regards,

Sniper

Por sd_snatcher

Prophet (3503)

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13-02-2016, 20:10

Por l_oliveira

Hero (533)

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14-02-2016, 14:28

sd_snatcher: This floppy controller crashes the MSX on boot if there's a MSX Audio with BIOS connected to the computer.

Por sd_snatcher

Prophet (3503)

Imagen del sd_snatcher

14-02-2016, 15:32

Yes. This interface has a known design mistake: it uses the frame-0 to access the FDC registers. It was a cost cutting decision to simplify the I/O decoder. This also has potential to give trouble in certain computers with unusual subROMs.

My idea was to redesign the interface:

1) Place the FDC registers in the correct 7FF0 region, thus fixing the design mistake
2) Add built-in Nextor support
3) Replace the EPROM with a Flash to allow easy Nextor updates
4) Add Disk-change signal support, so it can behave like the Turbo-R built-in interface when regarding to disk buffers/cache
5) Publish the FDC driver source so anyone who's experienced in FDC programming could add 1.44MB disk support

The problem is: I'm not having enough free time for that. So the project stays in the shelf.

Por OeiOeiVogeltje

Paragon (1406)

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14-02-2016, 20:08

so
how about that FDC 600?

Por zPasi

Champion (499)

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14-02-2016, 20:32

sd_snatcher wrote:

Yes. This interface has a known design mistake: it uses the frame-0 to access the FDC registers.

What does that frame-0 mean here?

Por l_oliveira

Hero (533)

Imagen del l_oliveira

14-02-2016, 20:59

zPasi wrote:
sd_snatcher wrote:

Yes. This interface has a known design mistake: it uses the frame-0 to access the FDC registers.

What does that frame-0 mean here?

Memory area 0x0000-0x3FFF on Z80 address space

Por zPasi

Champion (499)

Imagen del zPasi

14-02-2016, 21:39

Quote:

Memory area 0x0000-0x3FFF on Z80 address space

I see. Why is that a problem?

Por l_oliveira

Hero (533)

Imagen del l_oliveira

14-02-2016, 22:34

Because MSX Audio BIOS install a handle for it's "MUSIC BIOS" which reside at that spot and somewhat hijacks the computer interrupts (similar like the MSX2 subrom does).

Por pseen

Resident (60)

Imagen del pseen

15-02-2016, 00:42

Will this work with the Sony HBD50, ie substitute the original cable/cartridge interface? I have the actual drive, but miss the connector:

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