>>>>> "MagerValp" == MagerValp <MagerValp@Goth.Org> writes: Ojala> Anyway, a somewhat different but related question I'm trying to Ojala> get an answer to is: How does the C128 ROM detect if the drive Ojala> is Burst-capable? MagerValp> It's in my C128 PRG, which is at home, but I think the C128 MagerValp> it jiggles the extra line (/SRQ?) and waits for something MagerValp> to answer. At home now, with the PRG in my lap. The first paragraph of the Fast Serial Bus section reads: FAST PROTOCOL To function as a fast talker, the system must be addressing a fast device, such as the 1571 disk drive. When addressing any device, the C128 sends a fast byte, toggling the SRQ line eight times, with the ATN line low. If the device is a fast device, it will record the fact that a fast controller accessed it and respond with a fast acknowledge. If the device is a slow device, no response is delivered and the C128 then assumes it is talking with a slow device. The status of drive speed is retained until the device is requested to untalk or unlisten, if an error occurs, or if a system reset occurs. -- ___ . . . . . + . . o _|___|_ + . + . + . . + + Per Olofsson o-o . . . o + MagerValp@Goth.Org - + + . http://www.cling.gu.se/~cl3polof/ - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
Archive generated by hypermail 2.1.1.