> On 10 Jul 2026, at 11:11, ruud_at_baltissen.org wrote: > > Hallo allemaal, > > > I have programmed a lot in assembly for the Commodore but thinking back of what I did, about 99% concerned the Commodore drives. Hardly the computers. > > So I could do with some help or info on two items, please: > > - Checking if a device is present. Of course I did some homework. At $F237 starts the routine for 'opening a channel for input'. I have to provide a secondary address, which is $60 IMHO, and at $F249 StatusIO, serial status byte at $90 should be checked. Bit 7 tells us whether the device is present or not. > Is this good enough or did I miss something? It's been a long time since I wrote this so I don't remember everything but in my lib there is this file: https://cld.silverdr.com/s/xGWSZSZ2m5EfN3b which I used many times later. -- SDReceived on 2026-07-10 13:00:38
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