Tuesday, October 4, 2022

Cassette SAVE and LOAD, pt 2

After some research I found out that my MacBook needs a resistor from the sleeve to ground to identify the TRRS jack as having a microphone or audio input. 10k ohm was the highest that still worked reliably. However, it took hours to get everything soldered up nicely. But it works!! I can load and save programs to and from the mac as a virtual cassette recorder for the MC-10.
Pinout:
3.5mm TRRS plug
|   |
-----
  |   = (5) MIC + 10K OHM resistor to ground
  _
  |   = (2) Signal Ground
  _
  |   = (N/C) right EAR
  _
  v   = (4) left EAR or AUX

BASIC after the break...
5 REM "SUPER SIMPLE TEXT WRITER" 10 CLS 20 INPUT X$ 40 GOTO 20

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