From: Marko Mäkelä (marko.makela_at_hut.fi)
Date: 2002-11-10 10:21:09
On Sat, Nov 09, 2002 at 12:13:22PM -0600, David Wood wrote: > Does this occur when the PC is -and- is not hooked to the cn232? I didn't ask, but I think yes, it occurs in both cases. The device works properly in port #2. I haven't measured the current consumption of the C2N232 lately, but I think it would be in the order of some tens of milliamperes. Connecting something to the RS-232 port shouldn't matter, since all RS-232 contacts (except ground) are routed via a DS14C232CM or MAX232CSE. It could still be a ground loop, but the device does work in the other port. On Sun, Nov 10, 2002 at 12:44:21AM -0500, William Levak wrote: > It sounds like you have a short on the cassette port. Probably one > of the transistors that drive the port (Q4, Q5, Q6), the voltage > regulator (VR2), or capacitor (C70). Since the operating conditions are > different, a marginal component may behave differently. > > There may also be a marginal short on the connector or circuit traces. > > Another, simpler possibility is that the connector does not line up > correctly with the card edge. Thanks for the suggestions, I'll pass them on. One thing that occurred to me from the schematic diagram (http://www.funet.fi/pub/cbm/schematics/computers/pet/2001N/320349-3.gif) are the cassette jumpers. Could they have been set inappropriately? Marko Message was sent through the cbm-hackers mailing list
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