Earlier I wrote: > I will investigate the "very early" standard QL next week. > First I will check the hardware (e.g. with loopback cable as > Tony suggests), then I will do several tries (e.g. swap ROM > chips with JM, swap ZX8302/IPC). I'll report my findings. I swapped each socketed chip (first ROM's, then IPC, ZX8302, ZX8301 one after another) and tested with Thorn-EMI Ser1toSer2 Test-Rig. Result: The Serial ports are not working in this early QL.
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