InputTest_MiSTer

Overview

A custom mini-system running an input test utility. Currently shows all standard HPS sourced inputs (joystick, analog, paddle, spinner) simultaneously.

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Hardware

A simple bespoke (i.e. I made it up with no real plan) 8-bit system with a 40x30 character display, each character can be set to one of 256 colours

Components

• Z80 CPU (tv80 by Guy Hutchison, based on VHDL T80 core by Daniel Wallner)
• jtframe_vtimer for VGA timing (from JTFRAME by Jotego)
• 16Kb program ROM (port 1 cpu, port 2 download)
• 16Kb work RAM (port 1 cpu)
• 2Kb character ROM (port 1 cpu, port 2 download)
• 2Kb character RAM (port 1 cpu, port 2 graphics)
• 2Kb colour RAM (port 1 cpu, port 2 graphics)
• 3 Memory-mapped IO regions (all read-only). Yes I know about MREQ but SFRs are annoying in sdcc so :)
  • Hardware state (H/V Sync, H/V Blank etc) (8 bytes)
  • joystick_5->0 from HPS (192 bytes)
  • joystick_analog_5->0 from HPS (95 bytes)

Memory Map

Start	End	Length	Name
0x0000	0x3FFF	0x4000	Program ROM
0x4000	0x47FF	0x0800	Char ROM
0x6000	0x6000	0x0001	System inputs (video timings etc)
0x7000	0x70BF	0x00C0	Joystick inputs
0x7100	0x71BF	0x00C0	Analog inputs
0x8000	0x87FF	0x0800	Char RAM
0x8800	0x8FFF	0x0800	Colour RAM
0xC000	0xFFFF	0x4000	Work RAM

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Software