Floppy driver board
Rick Murray (539) 13742 posts |
😂👍👍👍 |
Steve Pampling (1551) 8124 posts |
I should point out that when writing that, I had the thought that if the answer to that was no, then how many OS’s out the could you run GPL code on? That said, and steering away from the bull, how is everybody’s search for decently licenced code and a viable floppy reader for modern RO kit going? Edity: |
Steffen Huber (91) 1945 posts |
I thought that was said and done a long time ago (like, on page 1 of this thread): GreaseWeazle. All code is MIT licensed. Whether the RISC OS port of Python is up to it remains to be seen – serial port access is needed, and the RISC OS USB Serial driver needs to be compatible with the GreaseWeazle hardware. But this is not the use case I am aiming for, so I won’t be the one trying that out. |
Dave Higton (1515) 3477 posts |
If you avoid 74 series stuff, you’ll have to come up with a more complicated and expensive driver to drive the termination resistors – and, yes, they are necessary, unless you’re going to compromise cable length – and, maybe, reliability. Transmission lines. Been there, done a lot of that. Do them properly, or risk unpredictable consequences. |
Rick Murray (539) 13742 posts |
Unless you’re talking about SCSI in which case it’s a black art. Back in the day, this is the setup that worked for me: A5000 & Tape [*] hard Morley [*] ----- Streamer ----- disc [ ] * = terminating resistors Did lots of tests. Each device worked fine when by itself and terminated. But all three, only worked correctly when the middle device was terminated and the end one wasn’t. Otherwise there were all sorts of errors (if I recall “no sense” was the most common). I know, that defies everything ever written about SCSI. I even managed to get my local(ish) library to order the SCSI spec from a reference library somewhere weird like Belfast 1 and it was a slog to read (especially as it had to be read in the library) but it said the same thing the Morley user guide did – each end of the chain. <shrug> 1 Belfast is “somewhere weird” when your library is Woking! |
Dave Higton (1515) 3477 posts |
For any bidirectional shared bus, that’s the only sensible configuration. |