Reply to post: Re: Programming vs Hacking "4096 baud"

10 PRINT "ZX81 at 37" 20 GOTO 10

Simon Harris Silver badge

Re: Programming vs Hacking "4096 baud"

I think you'd need to do more than just change the UART baud rate.

Wouldn't you also have to change the CUTS modulation frequency generator (it normally generated 1200/2400Hz, and I believe in the Nascom 2 was generated by dividing down a 500kHz clock using CMOS counters), or the phase would keep shifting and you wouldn't get a complete cycle for each bit?

You'd need a 4096/8192Hz pair of signals - for comparison the MSX's 2400 baud doubled the CUTS modulation tones to 2400/4800Hz. I had an Oric-1 for a while which had a 2400 baud option, but I could never get it to work reliably. Well done if your 4096 baud worked!

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