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eZ80->ESP32 UART connection fails if board booted without keyboard connected #39

@oldpatientsea

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@oldpatientsea

When booting the Olimex board without a keyboard connected, the MOS version string is displayed as garbled.

Seen in VDP 1.03 RC3 / MOS 1.03 RC3 and VDP 1.03 RC4 / MOS 1.03 RC4. No other versions tested yet for comparison.

Note this is untested on the original board and may not be specific to Olimex one.

Stepping through MOS code in debugger allowed MOS version string to be displayed clearly (suggesting it may be related to timing perhaps since this process introduces delays?).

Will add further information when I have had a chance to investigate.

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