To review a topic involving the interface between vintage microprocessor architectures (like the Intel 8085) and modern diagnostic tools, the most appropriate group would be Senior Embedded Systems Engineers and Digital Logic Architects.

This group possesses the specialized knowledge of 8-bit bus protocols, timing diagrams, and state-machine analysis required to appreciate the nuances of logic analyzer triggering and deep-trace memory buffers.

Senior Systems Engineer Summary: SDK-85 Logic Analysis & Multi-Level Triggering

Abstract: This technical demonstration details the application of a 32-channel high-speed logic analyzer to an Intel 8085-based SDK-85 microcomputer. The session focuses on the configuration of parallel bus decoders and the implementation of sophisticated multi-level hardware triggers to capture specific code execution paths. By mapping 16 address lines, 8 data lines, and critical control signals (Read, IO/M), the operator demonstrates how to visualize bus activity in real-time. A key highlight is the use of a three-stage sequential trigger—monitoring for a specific instruction fetch (0xC3 Jump) following a control line transition—to isolate startup behavior. The demonstration concludes by showcasing the analyzer's ability to manipulate the pre-trigger/post-trigger buffer ratio, allowing for retrospective "back-in-time" analysis of system faults.

Technical Summary and Key Takeaways:

• 0:00 Hardware Interface and Signal Mapping: The setup utilizes a 32-bit logic analyzer interfaced with an SDK-85. The capture includes the full 16-bit address bus, 8-bit data bus, and control signals (RD, WR, IO/M). Logic levels are stabilized near the target machine before being transmitted to the DMA-based memory capture device.
• 1:18 Software UI and Buffer Management: The analyzer software supports up to 16 megasamples of depth. Navigational controls allow for rapid zooming and panning through the waveform. The sampling rate for this demonstration is calibrated to 25 MHz, though the hardware is capable of 500 MHz for high-speed transients.
• 3:06 Parallel Bus Decoding: The software allows for the grouping of individual channels into functional buses. The user demonstrates creating an "Address Bus" (A0-A15) and a "Data Bus" (B0-B7), which the software automatically decodes into hexadecimal values for easier instruction tracing.
• 5:43 Multi-Level Trigger Logic: Beyond simple edge triggering, the system supports complex state-based triggering.
  • Level 0: Detection of a falling edge on the READ line.
  • Level 1: Detection of a specific bit pattern on the data bus (0xC3, the opcode for a JMP instruction).
  • Level 2: Detection of a rising edge on the IO/M signal.
• 07:25 Validation of Trigger Sequence: By hitting the manual reset on the SDK-85, the operator forces the machine into the specified state sequence. The analyzer successfully captures the event, proving its utility in debugging complex boot-up routines or intermittent software-hardware handshake failures.
• 8:45 Pre-Trigger Buffer Configuration: A critical takeaway is the adjustment of the trigger position within the capture window. By setting the trigger point to 60%, the engineer can view the 60% of data that occurred before the trigger event, which is essential for identifying the "root cause" of a crash rather than just the crash itself.
• 9:57 Expansion Capabilities: The 32-bit width of the analyzer is highlighted as the primary driver for this setup, providing enough overhead to monitor complex parallel systems while still offering built-in decoders for serial protocols like I2C, SPI, and CAN.