LPT100: A PIC32MZ Emulator for the Iomega ZIP100 Parallel Port Drive
3 days ago
- #Hardware Emulation
- #Microcontroller
- #Retro Computing
- The author initially used a PIC18F4680 microcontroller for the Iomega ZIP100 parallel-port emulator but faced performance issues due to its 8-bit architecture and slow SPI communication.
- Transitioned to a PIC32MZ2048EFH144 microcontroller for better performance, leveraging its 32-bit architecture, higher clock speed (180MHz), and USB host capabilities.
- Implemented Direct Memory Access (DMA) for efficient handling of parallel port data, avoiding the pitfalls of polling methods used with the PIC18F.
- Developed a user interface with buttons, LEDs, and an SSD1306 I2C LCD for the LPT100 emulator, including a parallel port tester mode for hardware validation.
- Achieved successful emulation with PALMZIP on a Book8088, demonstrating read/write operations, though transfer speeds were limited by the host's processor speed.
- Encountered compatibility issues with faster systems like the Pocket 386, where DMA data capture couldn't keep up with the higher parallel port transfer rates.
- Considered optimization strategies including PCB redesign, AI-assisted code simplification, and migration to faster microcontrollers like the Teensy 4.x for future improvements.