On Mon, 6 Sep 1999, Steve Judd wrote: > > PS: Is it "a 1541" or "an 1541" ? :) > > "a 1541" :) A 'fifteen forty-one' if you ask me. That's today's useful email for the day... Regarding the SPEED-DOS parallel transfer cable with an IDE interface - surely the CIA will power-on reset to all inputs for the I/O port, which is high impedance. If a particular accelerated DOS happens to be incompatible with the IDE attachment, then you can simply disconnect the IDE devices, but I would certainly implement routines in the new disk drive DOS to make interleaved IDE and C64 transfers if the computer requested it. 3 out of 4 handshaking lines on the VIA are spare, so the interface could be very fast. Apparently filetype is one of the first bytes in the directory entry, and there are 32 bytes altogether. This means that an extra type can easily be added (there are a total of 128 filetypes possible, bit 7 being used to indicate a file is closed). After the 16 bytes for the filename there are 15 left over, or 13 if the two spare bytes at the end are not to be used. This should be plenty of space for other information (eg. start LBA address, #tracks, #sectors) about the subdirectory, and if more is needed the indirection pointing to the start of the 'file' can be used to store 254 bytes of information. Does anyone know how a LOAD"$",8 is implemented? Is it handled (as far as the computer is concerned) as a normal file called $ which the drive then traps and sends back a special text file? Or does the computer send a different kind of request... Richard - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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