Ok, I see what is going on. Life is going to be alot easier on you if you have a way to detect fast logic level changes, but if you do not there are a few simple parallel port debug programs out there on the market.
http://neil.fraser.name/software/lpt/ I will assume you are using the VO1CPU version of the schematic as that is the one that seems to make the most sense to me. 0. Pull the chips out of the sockets 1. Verify connection between DB-25 Pin 1, 74HCT373 Pins 1 and 11, and X2212 Pin 11 1a. Inspect for adjacent pin shorts (solder splashing ocassionaly happens right under the sockets). 2. Verify that pin 1 is high for the LPT port 3. Run the program downloaded from above and toggle pin 1 (strobe) to a low condition 3a. High should be approx 5Volts and low should be anything below .8V (Usually .0V) 4. Verify that the proper drives are present from the computers port. 5. Insert 74HCT373 and verify write enable drive levels again. 6. Insert X2212 and verify write enable drive levels again. Chances are your LPT port doesn't have enough "fan-out" and cannot drive both chips. In theory pin 1 from the DB-25 should go low, which when that happens will latch the data in the 74HCT373 and turn on the output drivers to give D0-D3 from the computer to the chip and command the X2212 to write. On 6/1/06, Paul Holm <[EMAIL PROTECTED]> wrote: > From VO1CPU: > http://www.engr.mun.ca/~gmarsh/phoenix/sch.txt > > From KG4LNE: > http://www.rtzaudio.com/kg4lne/docs/psxprog-b.pdf > > From KC5EVE: > http://www.cheavens.com/mark/radio/programmer3.pdf > > From VE7IT: > http://members.shaw.ca/swstuff/phoenix2212.html > > > ----- Original Message ----- > From: "DCFluX" > Sent: Thursday, June 01, 2006 10:20 AM > Subject: Re: [Repeater-Builder] KC5EVE s GE Phoenix Programmer > > > > Do you have a link to the schematic? > > > > > > > > Yahoo! Groups Links > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
