zippy - yet another serial fastloader

[JonBrawn]

It's a Pi1541, nothing special done to it.

[srowe]

It's a Pi1541, nothing special done to it.

OK, as you can see from the thread others have tested that, but I don't possess one myself.

[Mike]

It's a Pi1541, nothing special done to it.

To make things clear: JiffyDOS requires both computer and drive understand the JD protocol. Normally this involves replacing the KERNAL ROM in the computer and the DOS ROM in the drive. Instead of replacing the KERNAL ROM, zippy takes care for that on the computer's side by re-implementing the JD protocol with own routines.

It should be noted that the Pi1541 is a complete emulation of the CBM drives, including the drive CPU, and it only provides the JiffyDOS protocol if it is actually run with the floppy side ROM dump of JiffyDOS - unlike the SD2IEC devices, which again re-implement the JD protocol from the specification.

Running the Pi1541 with the ROM dump of the standard CBM DOS 2.6 is not sufficient in this case.

Jim Brain sells JiffyDOS - you need to state for which drive and for which computer you need it. To be more precise, you would need the JiffyDOS 1541/1541C/1541II DOS ROM Overlay Image for the Pi1541: https://store.go4retro.com/jiffydos-154 ... lay-image/

An alternative to JiffyDOS would be one of the few old-style drive speeders, which load own routines into the floppy RAM and replace the bus transfer routines at least, for a faster protocol. For NTSC, I only know about Compute!'s TurboDisk, which had been discussed here in Denial quite some years ago. I'd follow up in the other thread.

[JonBrawn]

OK, that's really useful information, thanks.

[MrSterlingBS]

Hi,

i have used Mike‘s Minigrafik DiaShow to compare some speed loaders. You can See the different directly on the screen.

BR
Sven