Compatibility issues between1541 real/emulated and SD2IEC drives (...Split from VicSAM without SID)

[Noizer]

Hi! I often heard about ...

I guess that this turbo works with real/emulated 1541 drive only (maybe 1571 too) not with SD2IEC drives, for SD2IEC drives you have to use SJLOAD.

Regardless of the described, what are finally the differences between 1541 real/emulated and SD2IEC drives and how could software developers take account of these?
BR

[nbla000]

I don't remember well, maybe I'm not exact but the concept is that Real/Emulated 1541/1571/1581 drives have an internal routine in a RAM portion that you can overwrite with m-w command to write your routine from the CBM machine (Vic-20/C64/C16/etc/etc) and this is the method that all "classic" Fastloaders use to speedup drive, SD2IEC drives use a rom derived from JiffyDOS, so you may speedup it by installing the JiffyDos chip on your CBM machine or by using SJLOAD like I do with Mega-Cart.

[groepaz]

what are finally the differences between 1541 real/emulated and SD2IEC drives and how could software developers take account of these?

sd2iec is not a floppy drive emulator - it does not emulate the CPU that is in a 1541 drive, so whatever program tries to upload code to the drive will not work. typically that includes all sorts of fastloaders, but also some demos that use the drive as a coprocessor. it does also not emulate the floppy memory so stuff accessing the buffers in a 1541 specific way may also not work correctly.

for sd2iec compatibility, software developers may want to use kernal functions only, that will always work.

SD2IEC drives use a rom derived from JiffyDOS

no. it uses no "rom" in that sense at all. it supports a few fastloader protocols natively, one of which is jiffydos.

[nbla000]

Thanks for your explanations as ever

[Noizer]

Thanks @groepaz and @nbla000.
Is it known which loaders are compatible with Sd2iec?
BR

[nbla000]

Thanks @groepaz and @nbla000.
Is it known which loaders are compatible with Sd2iec?
BR

For the Vic-20 SJLOAD (software) or JiffyDos Chip (Hardware)

Information taken from the sd2iec firmware wiki,
faq 1: Are fastloaders supported?

[groepaz]

I'd just look at its README: https://www.sd2iec.de/gitweb/?p=sd2iec. ... ME;hb=HEAD (scroll down, there is a list somewhere)