VTech UDC card 20 pin to 19 pin adapter The 19 pin connectors have the pins numbered. If you check the UDC card you should find the 20 pin connector numbered. 20 pin 19 pin 1 -------- 16 2 -------- 11 3 -------- 2 4 -------- 12 5 -------- 3 6 -------- 13 7 -------- 4 8 -------- 14 9 -------- 5 10 ------- 15 11 ------- 6 12 ------- NC 13 ------- 7 14 ------- 17 15 ------- 10 16 ------- 18 17 ------- 8 18 ------- 19 19 ------- 8 20 ------- NC Pins 12 and 20 on the 20 pin connector aren’t connected and pin 1 and 9 on the 19 pin connector aren’t connected. Wayne "Wayne Stewart" wrote in message news:yoU4c.171380$A12.149969@edtnps84... : VTech UDC card 20 pin to 19 pin adapter : : The 19 pin connectors have the pins numbered. : If you check the UDC card you should find the : 20 pin connector numbered. : : 20 pin 19 pin : : 1 -------- 16 : 2 -------- 11 : 3 -------- 2 : 4 -------- 12 : 5 -------- 3 : 6 -------- 13 : 7 -------- 4 : 8 -------- 14 : 9 -------- 5 : 10 ------- 15 : 11 ------- 6 : 12 ------- NC : 13 ------- 7 : 14 ------- 17 : 15 ------- 10 : 16 ------- 18 : 17 ------- 8 : 18 ------- 19 : 19 ------- 8 : 20 ------- NC : : Pins 12 and 20 on the 20 pin connector aren’t : connected and pin 1 and 9 on the 19 pin : connector aren’t connected. : : Wayne If this is right, then a Disk II directly connected to it would allow writing to a protected disk, and Phase0 would not be grounded. Compare to Disk II to DB-19 wiring below. IDP-20 pins DB-19 pins 1 GND-------------------> 1 GND 2 PHASE 0---------------> 11 PHASE A 3 GND-------------------> 2 GND 4 PHASE 1---------------> 12 PHASE B 5 GND-------------------> 3 GND 6 PHASE 2---------------> 13 PHASE C 7 GND-------------------> 4 GND 8 PHASE 3---------------> 14 PHASE D 9 -12 V-----------------> 5 -12V 10 WRITE REQ-------------> 15 WRITE REQ 11 +5V-------------------> 6 +5V 12 +5V-------------------> 6 +5V 13 +12-------------------> 7 +12V 14 DRIVE ENABLE----------> 17 Drv1 / 9 Drv2 15 +12V------------------> 7 +12V 16 READ DATA-------------> 18 READ DATA 17 +12V------------------> 8 +12V 18 WRITE DATA------------> 19 WRITE DATA 19 +12V------------------> 8 +12V 20 WRITE PROTECT---------> 10 WRITE PROTECT 16 NOT CONNECTED Bill @ GarberStreet Enterprizez };-) Web Site - http://garberstreet.netfirms.com Email - willy4SPAM6pa@comXcast.net Remove - SPAM and X to contact me --- This email ain't infected, dude! Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.593 / Virus Database: 376 - Release Date: 2/21/04 Bill Garber wrote: > If this is right, then a Disk II directly connected > to it would allow writing to a protected disk, and > Phase0 would not be grounded. You are correct there is a discrepancy. It looks like my ohm meter is starting to read erratically. So here's a revised pinout 20 pin 19 pin 1 -------- 16 2 -------- 11 3 -------- 2 4 -------- 12 5 -------- 3 6 -------- 13 7 -------- 4 8 -------- 14 9 -------- 5 10 ------- 15 11 ------- 6 12 ------- 6 13 ------- 7 14 ------- 17 15 ------- 10 16 ------- 18 17 ------- 8 18 ------- 19 19 ------- 8 20 ------- 10 Pin 1 and 9 on the 19 pin connector aren’t connected. Wayne