Z8C-Homebrew-Computer/OperatingSystem/monitor_v2/monitor.md

Z8C Monitor V2

Monitor V2 is a less bloated monitor for my Z80 homebrew computer

System

• Z80 CPU @ 3.686411MHz
• 48k Ram
• TMS9918 VDP (not used for normal operations)
• 2x AY3-8901
• Serial RS232 Ports

not implemented yet but already present in hardware:

• PS/2 Keyboard Interface
• RTC72421B real time clock

planned

• IDE interface
• 28J60 10Mbit ethernet interface
• dual joystick gameports

Terminal

• baud: 19200
• mode: 8N1
• parity: none
• temrinal: vt102
• flow: none / RTS(not implemented yet)

Commands

View memory content

?<addr> <len>

• addr: word in hex -> start address of hexdump
• len: byte in hex -> length of hexdump

Write memory content

!<addr> <byte>,<byte>,...

• addr: word in hex -> start address
• byte: byte in hex followed by space -> bytes to write to memory

Run program

$<addr>

• addr: word in hex -> start address of program

X-Modem

x<addr>

• addr: word in hex -> start address of recieved binary (at least 0x0420)

Write IO port

w<addr> <data>

• addr: byte in hex -> IO port address
• len: byte in hex -> data

Read IO port

r<addr>

• addr: byte in hex -> IO port address