collinfunk / i8080-emulator

An Intel 8080 and Taito 8080 emulator.

i8080-emulator

This repo contains a simple generic Intel 8080 emulator that can be used to emulate systems. It contains two example emulators which demonstrate usage. The The first emulator compiled as i8080-emulator runs old test executables written for CP/M. The other emulates the original TAITO 8080 Space Invaders machine.

Building

Building through a git clone requires GNU Autoconf & Automake, a 'make' implementation, and POSIX utilizes and shell. Any C compiler should work, though GCC is recommended. The Space Invaders emulator requires SDL2. This can be downloaded through most systems package manager or through an official tarball.

• https://gcc.gnu.org/install/
• https://www.gnu.org/software/autoconf/
• https://www.gnu.org/software/automake/
• https://www.gnu.org/software/make/
• https://wiki.libsdl.org/SDL2/Installation

Once installed you can clone the repo and build using:

$ git clone https://github.com/collinfunk/i8080-emulator
$ cd i8080-emulator
$ ./autogen.sh
$ ./configure
$ make all

Space Invaders

Space Invaders requires the original files to play. I'm not sure of the copyright status and I do not want to get banned off GitHub (I need a job) so they are not linked here. If there happened to be four 2 KB files online named, for example, invaders.e, invaders.f, invaders.g, and invaders.h the emulator would expect them to be combined into an 8 KB file. It would then expect the file name to be passed as a command-line argument. These two steps can be done with the following commands:

$ cat invaders.h invaders.g invaders.f invaders.e > invaders.rom
$ ./space-invaders ./path/to/invaders.rom

Controls

• 1: 1 Player
• 2: 2 Player
• 3: Insert coin
• ESC: Quit
• E: Toggle color
• Q: Toggle pause
• A: Move left
• D: Move right
• Space: Shoot

Video Demo

You can watch a basic gameplay demo of the Space Invaders emulator here:

• https://youtu.be/DwJ_SRG6vkw?si=yNOljTmH7fsMNet5

Screenshots

CPU Test Outputs

CPUTEST.COM

DIAGNOSTICS II V1.2 - CPU TEST
COPYRIGHT (C) 1981 - SUPERSOFT ASSOCIATES

ABCDEFGHIJKLMNOPQRSTUVWXYZ
CPU IS 8080/8085
BEGIN TIMING TEST
END TIMING TEST
CPU TESTS OK

Instruction count: 33971311
Cycle count:       255665052

TST8080.COM

MICROCOSM ASSOCIATES 8080/8085 CPU DIAGNOSTIC
VERSION 1.0  (C) 1980

CPU IS OPERATIONAL
Instruction count: 651
Cycle count:       4924

8080PRE.COM

8080 Preliminary tests complete
Instruction count: 1061
Cycle count:       7814

8080EXM.COM

8080 instruction exerciser
dad <b,d,h,sp>................  PASS! crc is:14474ba6
aluop nn......................  PASS! crc is:9e922f9e
aluop <b,c,d,e,h,l,m,a>.......  PASS! crc is:cf762c86
<daa,cma,stc,cmc>.............  PASS! crc is:bb3f030c
<inr,dcr> a...................  PASS! crc is:adb6460e
<inr,dcr> b...................  PASS! crc is:83ed1345
<inx,dcx> b...................  PASS! crc is:f79287cd
<inr,dcr> c...................  PASS! crc is:e5f6721b
<inr,dcr> d...................  PASS! crc is:15b5579a
<inx,dcx> d...................  PASS! crc is:7f4e2501
<inr,dcr> e...................  PASS! crc is:cf2ab396
<inr,dcr> h...................  PASS! crc is:12b2952c
<inx,dcx> h...................  PASS! crc is:9f2b23c0
<inr,dcr> l...................  PASS! crc is:ff57d356
<inr,dcr> m...................  PASS! crc is:92e963bd
<inx,dcx> sp..................  PASS! crc is:d5702fab
lhld nnnn.....................  PASS! crc is:a9c3d5cb
shld nnnn.....................  PASS! crc is:e8864f26
lxi <b,d,h,sp>,nnnn...........  PASS! crc is:fcf46e12
ldax <b,d>....................  PASS! crc is:2b821d5f
mvi <b,c,d,e,h,l,m,a>,nn......  PASS! crc is:eaa72044
mov <bcdehla>,<bcdehla>.......  PASS! crc is:10b58cee
sta nnnn / lda nnnn...........  PASS! crc is:ed57af72
<rlc,rrc,ral,rar>.............  PASS! crc is:e0d89235
stax <b,d>....................  PASS! crc is:2b0471e9
Tests complete
Instruction count: 2919050698
Cycle count:       23835665055