Looking for a M8330 or a couple of SN74194's

Date: Wed, 26 Mar 2008 13:20:59 +0000 From: RodSmallwood at mail.ediconsulting.co.uk To: cctech at classiccmp.org CC: Subject: Looking for a M8330 or a couple of SN74194's Hello All As I said before my PDP-8/e partly failed insofar as it would not load data into memory. I rewound my personal memory back thirty plus years and did a lot of relearning about how pre microprocessor systems worked. Toggling the Add Load switch puts the address on the bus and triggers the time state generator to cycle. In the correct time slot the address is set in the memory ready for the data. Setting the Switch Register with the data and toggling the DEP key should write data from the SR to the pre set memory location via the bus in another time slot. The time states are generated by a string of SN74194 shift registers and the slot for the data is not being decoded. It looks like the '194 is at fault. Now I need either a couple of 74194's or an M8330 board. Rod Smallwood TheDECcollector