Why do Cold Resets sometimes cause peripherals to go unresponsive?

[gs80065xe]

Why do Cold Resets sometimes cause peripherals to go unresponsive? I've noticed this on my Atari 800 and 65XE. I'll have a few successful cold resets and then things will get into a state where the Atari doesn't see any peripherals without cycling the power on the machine. This occurs with SD Drives, AVG cart and Fujinet. I've encountered it with using SpartaDos X's COLD command, or running E477 and poking 580,1 in Basic before pressing the reset button.

 

Thanks.

[+Nezgar]

My first guess would be if the devices you mention were using a faster UltraSpeed SIO divisor prior to the reset, but aren't able to detect/fallback to standard 1x SIO as well as a real US Doubler, Happy, Speedy etc...

[gs80065xe]

For the SIO devices, I have them at 55 - 56kbps for SpartaDos X. Maybe that’s why. 

[drac030]

Check out the SIOSET command. If the SIO does not want to detect highspeed automatically, you can set this manually:

 

SIOSET drive US divisor

 

e.g.

 

SIOSET 1 US 8

 

[gs80065xe]

Thanks. I'll give it a try.

 

[_The Doctor__]

also consider some of these items do not accept a sioreset in the same way other devices do.