Intel 8080 CPU Emulator
2010 by Stefan Tramm
based on
ShellInABox and its marvelous VT100 emulator by Markus Gutschke
(http://code.google.com/p/shellinabox/)
js8080 by Chris Double (http://www.bluishcoder.co.nz/js8080/)
z80pack by Udo Munk (http://www.unix4fun.org/z80pack/)
This program emulates a complete Intel 8080 Microcomputer that runs CP/M.
It supports 4 disk drives (8' CPM standard), which are stored persistently
in the browsers local database. Disks can be mounted by the monitors
'r' (reads from server) and 'dsk' commands (supports mounting of images
via drag-n-drop from your host computer). A paper tape is also available,
mount new tapes by drag-n-drop onto the main window. Modified disks and
punched tapes can be posted to arbitrary webservers ('ptp' and 'dsk N'
commands). The emulator is written as a web app and is therefore cached
by your browser, therefore no further internet connection is required
to run the emulator.
When CPM is booted, type CTRL-. to escape to the monitor and 'g' to
continue.
Chrome6+ (or Safari5+) required. Firefox does not support the disk
subsystem, as currently only WebDB is implemented.
Start Emu8080 for the full adventure!
Start GREEN CRT MODE :)
Start IMSAI 8080
--------------------
Some Intel HEX files with demo programs, after loading the
file with the read command 'r', start with 'g 0'.
hello.hex -- Hello World
STU
loop.hex -- an endless loop printing dots, stop with Ctrl-.
10mcyc.hex -- execute 10'023'517 clock cycles
basic.hex -- MS 8K BASIC ('g 1000' to start, 'exit' to leave)
tinybas.hex -- Dr. Li-Chen Wang Tiny BASIC 1976 (use UPPER case)
--------------------
CPM and disks
cpma.cpm -- CP/M 2.2 boot disk
insert the A: diskette: 'r 0 cpma' needed only once
load boot sector to mem: 'b'
start the boot loader: 'g 0'
Format diskettes in drives B: to D: with 'F 1' to 'F 3'.
For further info read the CP/M 2.2 Manual (540KB) and
the Intel 8080-8085 Assembly Language Programming Guide (5.8MB).
zork1.cpm -- classic adventure game
insert the game into B: 'r 1 zork1' needed only once
when CP/M is booted: 'b:'
'zork1'
many thanks to Neozeed (http://virtuallyfun.blogspot.com/)
for contributing the image! enjoy it :-)
volks4th.cpm -- Volks 4th for 8080
volks4th2.cpm -- data disk
insert the 4th disks: 'r 2 volks4th'
'r 3 volks4th2'
when CP/M is booted: 'c:'
'volks4th'
many thanks to Carsten Strotmann from 4th eV for his contribution.
Details at forth-ev.de.
Michael Steil also wrote a nice and helpful article on this emulator.
Many thanks to Michael aka pagetable.
--------------------
Used I/O ports (decimal addresses):
0 - console status
read console 0 status:
0xff : input available
0x00 : no input available
1 - console data
2 - printer status (not implemented yet)
3 - printer data
4 - auxilary status / command
read status: 0xff : input available
write command: 0x01 : rewind tape
5 - auxilary data
read from paper tape, tapes are mounted by dropping a text file
write to puncher
10 - FDC drive
11 - FDC track
12 - FDC sector
13 - FDC command
write FDC command: transfer one sector in the wanted direction,
0 = read, 1 = write
read FDC command: check for IO completion,
0 = still in progress, 1 = IO done
14 - FDC status
The status byte of the FDC is set as follows:
0 - ok
1 - illegal drive
2 - illegal track
3 - illegal sector
4 - seek error
5 - read error
6 - write error
7 - illegal command to FDC
15 - DMA destination address low
16 - DMA destination address high
--------------------
The Z80 assember listing of the sector 0 boot loader
and the Z80 assembler listing for the used BIOS.
A simple savefile CGI to handle the upload of paper tape
puncher files and disk images. DONT INSTALL THIS PROGRAM
ON A PUBLIC WEBSERVER, it contains severe security holes!
USE AT YOUR OWN RISC.
--------------------
The 8K BASIC is derived from the NASCOM 8K BASIC by Microsoft,
sources are located here. For details take a look at the
scanned manual (1.3MB). Instead of 'CSAVE' and 'CLOAD' use
'SAVE' and 'LOAD' to save/load from the virtual papertape
device. Use 'EXIT' to go back to the console. Don't expect
that the screen oriented commands work.
You can download a simple benchmark BASIC program which
must be dropped on the terminal window to be mounted as a
paper tape, which can be loaded from inside BASIC via 'LOAD'.
The source is linked inside the REM lines, just click it :-)
--------------------
The 4K Dr. Li-Chen Wang Tiny BASIC is derived from Bruce Sherry's
CP/M version. The source and documentation ca be found here.
This version is modified, 'BYE' will terminate and halt the program.
'SAVE' and 'LOAD' do not allow/require a filename, as the program
will be saved/loaded to/from the virtual papertape device.
The documentation and modified source are also available here
(without any warranties).
Tiny BASIC commands, statements and functions use UPPER case only!
Have fun -- Stefan Tramm
--------------------
On 2013-08-20 Chris Double (@doublec) mentioned this work
as using his 8080 emulator on Twitter. Many Thanks Chris!
--------------------
Emu8080 is a complete CP/M system, it emulates an Intel 8080
microprocessor with VT100 terminal, four 8' floppy disk drives,
a paper tape reader, a paper tape puncher and line printer.
The disk drive data is stored in the browser local Web-SQL database,
so you need either Safari5+ or Chrome6+. If you want to mount
your own disk drives and want to mount desktop files on the
paper tape reader via Drag-n-Drop, you need Chrome6+.
The emulator is implemented as a modern HTML 5 Web App, so
after first starting, your browser will cache all files, so
that you can run it even without an internet connection.