VR177x (WD1772 replacement)

[rubber_jonnie]

It looks like vRetro in New Zealand have come up with a replacement for the WD1772. I don't think it has been released yet and isn't in the store, but I wonder if it is running at faster clock speeds like the Ajax.

[Gooeyblob]

Yes - " is designed to operate at both 8MHZ and 16MHZ the signal at the clock input pin is measured and the operating frequency set internally to match. If there is no clock signal present then if the clock input is 0V then the frequency internally is set to 8MHZ, if the clock input is +5V then the frequency is set to 16MHZ. This means a very simple interface (no external oscillators needed) can be used to change from DD to HD. In fact every gotek can be programmed to set HD/DD status on pin 2."

[rubber_jonnie]

Yes - " is designed to operate at both 8MHZ and 16MHZ the signal at the clock input pin is measured and the operating frequency set internally to match. If there is no clock signal present then if the clock input is 0V then the frequency internally is set to 8MHZ, if the clock input is +5V then the frequency is set to 16MHZ. This means a very simple interface (no external oscillators needed) can be used to change from DD to HD. In fact every gotek can be programmed to set HD/DD status on pin 2."

Sounds fantastic, thanks for the info

[alexh]

This is the only reference I could find online :

https://atarionline.pl/forum/comments.p ... e=1#Item_0

This is their homepage. Looks like they make IC replacements for various classic computers, concentrating on Sinclair Spectrum

https://www.vretrodesign.com/

The developer is called Charlie Ingley

[HigashiJun]

Very interesting.

[chronicthehedgehog]

https://www.vretrodesign.com/

The developer is called Charlie Ingley

I bought a ZX ULA replacement from him in the past. Quality stuff.

[stephen_usher]

Yeah, it's Charlie Ingley.

[troed]

Surprising that Gotek has pin 2 as an output. In the spec (and in the world of real floppy drives) it's an input.

However, it should work fine modifying the drives we know how to do it on - so this would support real drives too,

https://blog.troed.se/2017/01/20/the-ta ... i-mystery/

[HigashiJun]

However, it should work fine modifying the drives we know how to do it on - so this would support real drives too,

That would be great.

[arf]

is designed to operate at both 8MHZ and 16MHZ […]"

Do you know by chance whether a 32 MHz operation (for ED floppies) is planned? That’d be my usage scenario.