Texas Instruments
RS-422 and RS-485 interface circuits application and data book
The TTL data book
PC Scheme
The interface circuits data book for design engineers
The programmable logic data book
The TTL logic data book
Third-generation TMS320 user's guide
TI-89 TI-92 plus guidebook for advanced mathematics
Understanding solid state electronics
EIA-232 interface circuits
FPGA applications handbook
Fun with Math facts