Dominic Beesley had a go with BeebLink at the more recent ABUG last weekend, with the revision 03 PLD and no 2nd processor connected. It mostly worked nicely with his 65816 turbo Beeb (180 KB/sec throughput to I/O processor memory ![8)]( "Cool")
), but the system would occasionally get stuck after a reset, usually printing a bunch of repeated characters to the screen. It looked like this might be the MOS detecting a 2nd processor, and trying to print its startup banner, but we decided not to think too hard about this until Dominic had a chance to get some scope or logic analyser readings.
Maybe this would be related to the Tube misdetection issue that Hoglet mentioned here: https://www.stardot.org.uk/forums/viewt ... 33#p415533 - since if it misdetects the Tube in a similar way, then reads status values implying the FIFO is full, it'll just print junk forever.
I haven't seen anything ilke this on a B or Master, but (which I forgot about at the weekend) I have occasionally seen something similar happen on the Electron when resetting with no 2nd processor connected. I'm not certain I've seen this with the revision 03 PLD though.
--Tom
), but the system would occasionally get stuck after a reset, usually printing a bunch of repeated characters to the screen. It looked like this might be the MOS detecting a 2nd processor, and trying to print its startup banner, but we decided not to think too hard about this until Dominic had a chance to get some scope or logic analyser readings. Maybe this would be related to the Tube misdetection issue that Hoglet mentioned here: https://www.stardot.org.uk/forums/viewt ... 33#p415533 - since if it misdetects the Tube in a similar way, then reads status values implying the FIFO is full, it'll just print junk forever.
I haven't seen anything ilke this on a B or Master, but (which I forgot about at the weekend) I have occasionally seen something similar happen on the Electron when resetting with no 2nd processor connected. I'm not certain I've seen this with the revision 03 PLD though.
--Tom
Statistics: Posted by tom_seddon — Tue Jan 30, 2024 11:06 pm