Agemixer (02:29:34)
a very simple ADC converter: you can make this DAC, then manually drive it a triangle waveform, starting from 0 and adding up to value 15, fast. this gives a reference signal.

Agemixer (02:27:04)
so that 0000 gives out 0 volts, 1000 (=8) gives out 2,5 volts and 1111 (=15) gives out that almost 5 volts.

Agemixer (02:25:13)
simplest DAC (audio out) a set of resistors, into user port or such... in a way that each bit does halve the DC offset of the output signal.

Agemixer (02:22:33)
or, straight out from I/O. Like... disk drive or cassette 1-bit line

Agemixer (02:21:22)
Rap and you also asked where to get that sample data from. My dump answer is.... basically, from memory address onwards (using indexer or not, to advance to next sample;anyway)

Agemixer (02:05:49)
probably some other better ideas, but that's one "easy" approach to explain.

Agemixer (02:04:51)
lda sample,x , sta SIDsampl, inx, nop*6, lda sample,x , sta SIDsampl , bit $dcod .... or something, double writes during badline. Probably a scanline table lookup to check whether a badline occurs there.

Agemixer (01:58:49)
otherwise at badline it requires kinda little buffer to overcome that little timing issue, or speedcode

Agemixer (01:56:48)
badlines can be avoided though, with a correct timing.

Agemixer (01:56:17)
yes, it removes the badlines, so all the time can be reserved for CPU

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