TV Typewriter Cookbook by Don Lancaster
By Don Lancaster
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Sample text
Making pin 9 positive floats the outputs, allowing writing but not reading, or allowing the tri-state bus com bination of several devices on the i/o line. Note that only one en abled source can exist on the if o line at any single time. Access times of 500 ns and less are typical. Consult specific data sheets for timing restrictions on i/o operation. Typical supply cur rent is 60 mA. Note that input addresses may be redefined in any manner conve nient for circuit layout. 48 2112 STATIC RANDOM-ACCESS MEMORY (256X4, 16 I Pin, Common DATA INPUT/OUTPUT ( ( ( ( o 1/0) H�g�: ����E&&DI�:�; g:g TOP VIEW INPUT ADDRESSES This is a statis random-access memory organized as 256 words of four bits each in a 16-pin package with common input/output leads.
37 3600 KEYBOARD ENCODER, NKRO l @ l so i + I H i nt l z i A I Q i z i ' J •i l « l % 1 '" 1 x l s l w l l� l z� [ SP I I I I] I I I I I I I I I I I IHI I I - ! # OUTPUTS TO MATRIX 4 f NC lOOK ? + > clx V : 8 G 5� 6� T y u 7 I 8 0 9 SENSE INPUTS FROM MATRIX - YJ _l nul - 2 I - - - - TOP VIEW YO l 2 Y3 - - - - NC iClOCKI ASCII OUTPUT This is a scanning keyboard encoder with latch that samples 90 keys and provides a parallel ASCII output with parity. N-key rollover is possible if diodes are added to each key.
It is made by Intel, Advanced Micro Devices, and Synertek. The Texas Instruments 4039 is a similar device. The 2102 is arranged as 1024 one-bit words and is in a 16-pin package with separate input and output leads. Sources include Intel, Advanced Micro Devices, Fairchild, and Synertek. It is also known as the Intersil 7552, the Signetics 2602, and the Texas Instru ments 4033. The 2111 is arranged as 256 four-bit words and is in an 18-lead package. It has common input/ output leads and an output disable.