DavidMil Posted August 9, 2021 Share Posted August 9, 2021 I'm sure this has been discussed before, but can someone refresh my memory? What is the max number of devices that the SIO can handle? Thank you, DavidMil Quote Link to comment Share on other sites More sharing options...
Nezgar Posted August 9, 2021 Share Posted August 9, 2021 technically 256..... 1 8 bit byte for device ID.... But convention has disk drives starting at $31 for D1:, spartados X can address 15 drives up to $3F (I have done this myself with a patched US Doubler ROM) $40 for P1: through $48 for P9: $4F Device handler poll $50 for R1: through $53 for R4: $60 for C : dummy device ... and more... ie APETIME, RespeQt PCLINK, Fujinet etc. Physically... You may have a hard time getting a clean "ultraspeed" signal daisy chaned to 8 disk drives or otherwise reliably, and an Octopus, Quintopus, or Lotharek SIO Hub may be in order... 2 Quote Link to comment Share on other sites More sharing options...
Rybags Posted August 9, 2021 Share Posted August 9, 2021 In theory you could probably have some sort of signal booster which could allow the physical limit to be met (sort of like USB repeaters). And if there was some need to have more than 256 addresses you could probably just steal a couple of bits from the command ID. 1 Quote Link to comment Share on other sites More sharing options...
sup8pdct Posted August 9, 2021 Share Posted August 9, 2021 The std SIO will support 256 devices and a cassette, tho the cassette is a special case. There are other devices that don't follow the normal sio convention ( eg Rverter). James Quote Link to comment Share on other sites More sharing options...
Rybags Posted August 9, 2021 Share Posted August 9, 2021 Yeah... cassette would actually reduce it by one I think... assuming there's no other values for special cases or that set off bugs. Quote Link to comment Share on other sites More sharing options...
sup8pdct Posted August 9, 2021 Share Posted August 9, 2021 No. cassette doesn't use normal sio protocol. ie command line - command frame etc. James Quote Link to comment Share on other sites More sharing options...
xxl Posted August 9, 2021 Share Posted August 9, 2021 new devices (TM) can have their own SIO ID so you can infinitely multiply the number of connected devices with your own ID. Such a new device can also support its own protocol extended in relation to the system SIO. 2 Quote Link to comment Share on other sites More sharing options...
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