[twostickes]

Here is an early copy of Practical Electronics page I found somewhere on the web, showing an (original?) TI design by Nick Toop, and some RAM based tape routines. So Im guessing it was the original intention to have the voltage dividers on board (but not on the production version).

The routines are showing different delays as the issue iv board, so this may indicate there may have been a difference in timing , so I suppose I could run these routines and compare timings on the 'scope , hopefully they are the same !