Z80
An 8-bit microprocessor widely used in 1980s home computers and embedded systems. It is the core CPU of retro platforms such as the ZX Spectrum and supports assembly language programming.
Timeline (last 90 days)
Writing intros on the ZX Spectrum almost necessarily requires using Z80 assembly language; the code generated by C language compilers is far from meeting the Demoscene's stringent requirements for performance and size.
The ZX Spectrum is an 8-bit home computer released in 1982, with a 3.5 MHz Z80 processor and 48 KB of RAM.
The Z80 has a 16-bit address bus and can address 64 KB of memory; the ZX Spectrum 48K model maps ROM at 0x0000–0x3FFF, RAM occupies 0x4000–0xFFFF, the screen pixel area is located at 0x4000–0x57FF, and the attribute area is located at 0x5800–0x5AFF.
In ZX Spectrum raster effects, developers usually use the HALT instruction to wait for the frame interrupt, then align to the target scanline through precisely timed delay loops, with an error tolerance often of only a few T-states.
The ZX Spectrum's CPU clock is 3.5 MHz, and under the PAL standard the screen refreshes 50 times per second, with about 69,888 T-states per frame.
Z80 instructions have fixed machine cycle counts, for example LD A,B is 4 T-states and LD A,(HL) is 7 T-states.
pret/pokered is a complete disassembly of Pokémon Red/Blue completed by the community through reverse engineering, restoring the original Game Boy ROM to annotated Z80 assembly code.
All Facts (7)
Writing intros on the ZX Spectrum almost necessarily requires using Z80 assembly language; the code generated by C language compilers is far from meeting the Demoscene's stringent requirements for performance and size.
50%UnverifiedThe ZX Spectrum is an 8-bit home computer released in 1982, with a 3.5 MHz Z80 processor and 48 KB of RAM.
50%UnverifiedThe Z80 has a 16-bit address bus and can address 64 KB of memory; the ZX Spectrum 48K model maps ROM at 0x0000–0x3FFF, RAM occupies 0x4000–0xFFFF, the screen pixel area is located at 0x4000–0x57FF, and the attribute area is located at 0x5800–0x5AFF.
50%UnverifiedIn ZX Spectrum raster effects, developers usually use the HALT instruction to wait for the frame interrupt, then align to the target scanline through precisely timed delay loops, with an error tolerance often of only a few T-states.
50%UnverifiedThe ZX Spectrum's CPU clock is 3.5 MHz, and under the PAL standard the screen refreshes 50 times per second, with about 69,888 T-states per frame.
50%UnverifiedZ80 instructions have fixed machine cycle counts, for example LD A,B is 4 T-states and LD A,(HL) is 7 T-states.
50%Unverifiedpret/pokered is a complete disassembly of Pokémon Red/Blue completed by the community through reverse engineering, restoring the original Game Boy ROM to annotated Z80 assembly code.
50%