Desperado
Veteran Member
- Joined
- Nov 25, 2017
- Messages
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I haven't D12 ic on board.... i have SN74LS145 (IC101)Have you done what I asked you to do and check the two pins of the ICs to the connectors or not?
Dave
I haven't D12 ic on board.... i have SN74LS145 (IC101)Have you done what I asked you to do and check the two pins of the ICs to the connectors or not?
Dave
Already we are getting desperate and are going to replace something that is not faulty !Maybe bad sn74ls145
unfortunately I have already closed everything, I had to insert plastic shims in the connectors where the membrane is inserted. They were too loose and sometimes didn't make good contact.I have found that the A key should be connected to the D, F, J, K, :, SHIFT, and numeric pad keys 1 and 3 in one direction (as well as one pin of the connector).
In the other direction, the A key should be connected to the Z, CAPS LOCK, TAB, Q, ESC and the number keys 1 and 2 (as well as another pin of the connector).
This forms one row and one column of the keyboard. One of the connector pins should be connected to the output of the '145 decoder/driver and the other connector should go to the input port of the sound generator chip.
Dave