The keytranspose function of the SH-101 is not permanent unfortunately. So I decided to add a simple switch parallel to the keytranspose push button. Now I can transpose seque nces or arpeggios without pressing the transpose button. click on this picture to see the places where the switch should be soldered to.
The microprocessor working inside the SH-101 is a Toshiba TMP80C49P-6. The program for this processor is stored in a ROM which is built in to the chip and cannot be rewritten. If this part is broken, you usually have no chance to repair the synth. I tried to read the ROM contents with a BALEP-4 Eprom burner, which can read the contents of some very similar chip. The result is this file:
Update Feb. 2011: The code works fine (confirmed by Senso from www.vintageplanet.nl), but the 87C49 eats too much power from the powersupply of the SH101. So one has to replac e the powersupply too ;-(
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