Week 11 Tuesday -- MAE 412

• Addressing Modes for 6502 Assembly Language
• Real-time issues -- Delay, Latch, Handshake
• Delay: Speed of Relay (Careful when relays are used in conjunction with RR switches -- the relays don't respond instantaneously)
• Latch: Use /R/S Flip-Flop to Capture Transient Events
• Handshake: Use Handshakes to Guarantee Synchronization
• Programming Tips -- Flag to Test Sensors without Trapping Flow, FRANUM to force synchronization with track voltage
• Interactive Control - Demo and Flow Charts
• Block Override ('Protect a Block') - Demo and Discussion
• Forced Block Clear ('Release of Block') - Demo and Discussion
• Final Reports

• For information about the Interrupt Service Routine read Chapter 5 on Communications by Gurion and Simon in Volume 1 of the On-line Text.
• For information about the Bar-Code Reader, RR Signal Control, and Interlocking Control (Track Kill) read Chapter 6 on Block Management by Lecky and Fiderer in Volume 1 of On-line Text.
• Read Chapter 2 of Volume 1 of the On-line Text ("Hornby Railways ...")
• Document your working computer using ORCAD (see example on CIRCUITS page) -- Hand in next Tuesday (include 74LS244 buffer).
• Read Chapter 3 of CST -- available on-line (go to BLACKBOARD => LIBRARY => e-reserves => authentication page => user:mae412 password:littman1).  Continue studying the 6502 instruction set.