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Diffstat (limited to 'results/classifier/accel-gemma3:12b/kvm/1891829')
| -rw-r--r-- | results/classifier/accel-gemma3:12b/kvm/1891829 | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/results/classifier/accel-gemma3:12b/kvm/1891829 b/results/classifier/accel-gemma3:12b/kvm/1891829 new file mode 100644 index 000000000..935d54c17 --- /dev/null +++ b/results/classifier/accel-gemma3:12b/kvm/1891829 @@ -0,0 +1,12 @@ + +High bit(s) sometimes set high on rcvd serial bytes when char size < 8 bits + +I *believe* (not confirmed) that the old standard PC serial ports, when configured with a character size of 7 bits or less, should set non-data bits to 0 when the CPU reads received chars from the read register. qemu doesn't do this. + +Windows 1.01 will not make use of a serial mouse when bit 7 is 1. The ID byte that the mouse sends on reset is ignored. I added a temporary hack to set bit 7 to 0 on all incoming bytes, and this convinced windows 1.01 to use the mouse. + +note 1: This was using a real serial mouse through a passed-through serial port. The emulated msmouse doesn't work for other reasons. + +note 2: The USB serial port I am passing through to the guest sets non-data bits to 1. Not sure if this is the USB hardware or linux. + +note 3: I also needed to add an -icount line to slow down the guest CPU, so that certain cpu-sensitive timing code in the guest didn't give up too quickly. \ No newline at end of file |