6 Aug
2021
6 Aug
'21
10:01 a.m.
On 8/6/21 9:45 AM, Len via cctalk wrote:
The advantage of digitizing the output of the head preamp with a
https://usd.saleae.com/products/saleae-logic-pro-16 is you can do software
AGC and sometimes do eyeball recovery of dropouts.
Disadvantage is for a long tape you need >128gb of RAM as a capture buffer, and even
with lossless compression the captured data files
are quite large. The Saleae is also pretty expensive, but work really well.
Some years
ago, inspired by Paul Pierce's earlier program in Java, I wrote similar software in C
to decode the analog waveforms from tapes
in a variety of formats: 7-track NRZI, 9-track NRZI, PE, and 6250 BPI GCR, and 6-track
NRZI for Whirlwind.
https://github.com/LenShustek/readtape