: Dividing a 14MHz master clock to provide 7MHz for video and 3.5MHz for the Z80 CPU.
Implement the Logic (The ULA Replacement)For an authentic hardware feel, use a CPLD (Complex Programmable Logic Device) or FPGA. These chips can be programmed to behave exactly like the Ferranti ULA. If you prefer a software-defined approach, a high-speed microcontroller can "bit-bang" the video signal and manage memory timings. : Dividing a 14MHz master clock to provide
Original microcomputers relied on power-hungry, inefficient linear regulators (like the LM7805) that generated significant heat. For a portable design: If you prefer a software-defined approach, a high-speed
The original ULA halted the CPU whenever both tried to access the bottom 16KB of RAM at the same time (screen drawing took priority). In a modern design, you can eliminate this bottleneck entirely by using fast chips. SRAM is fast enough to allow dual-porting or interleaved access, meaning your display won't slow down your processor. 4. Going Portable: Display and Power In a modern design, you can eliminate this
If you want to design a microcomputer inspired by the ZX Spectrum, you should consider the following components: Go to product viewer dialog for this item. running at 3.5 MHz.
