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mention that the 'fullspec' version has more bidrectional lines

Ed Paradis 2020-08-18 20:38:29 -07:00
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Transceiver-Comparison.md

@ -109,4 +109,20 @@ They should probably be Schmitt-trigger inputs on the SCSI bus side. See the "Si
0.5v SCSI Maximum Output Voltage for Asserted Signal
0.2v Typical Driver-Asserted Signal
From [the 2.x schematic](https://github.com/akuker/RASCSI/blob/master/hw/rascsi_2p1/rascsi_2p1_sch.pdf), all signals are bidirectional, switched on three different signals.
Switched by `PI-DTD`:
> DP, D0, D1, D2, D3, D4, D5, D6, D7
Switched by `PI-TAD`:
> BSY, MSG, C_D, REQ, I_O
Switched by `PI-IND`:
> ATN, ACK, RST, SEL
### Notes
<a name="ref-1">(1)</a> [Comment by `saybur`](https://68kmla.org/forums/index.php?app=forums&module=forums&controller=topic&id=30399&page=7&tab=comments#comment-646496)