mikedx/z80emu

Open source portable free ZX Spectrum emulator

z80emu's Issues

TODO: Introduce hardware definitions for different models of spectrum

The core of the emulator should be changed so that specific models of spectrum (and other computers?) can be defined in separate hardware definition files. These could be compiled or read at runtime depending upon how the problem is solved. The immediate use for this includes different Spectrum rom (JGH for instance) or different hardware models (16k, 128k, +2, etc).

TODO: Tidy up Makefile

The Makefile needs a cleanup as we already have repetition. Should either be converted to use cmake or have some wildcard to reduce repetition.

TODO: Add Travis CI to perform automated cross platform build testing

I've setup a travis account to automate the testing. Will need configuring for all targets and some unit tests will need to be made.

TODO: Correct IO handling

Current IO handling is limited to basic keyboard input. No other IO is included, which causes some issues.

This needs to be address properly so that we can have proper "BEEP" support

TODO: Border emulation

Currently our screen buffer only handles the middle screen without border. This needs to be expanded so that the correct border colour is drawn at each interval.

Expanding on this, we should be able to do cycle correct timings for the screen to achieve the correct visual effects.

TODO: Provide IO layer to support SDL agnostic (or any rendering / input framework) version

Currently the emulator utilises SDL exclusively, but with some minor changes, this can be much more open.

I currently have code to support SDL1.2/2 in a test branch locally, which renders the screen to a buffer and accepts keycodes as an array (like the existing keymap matrix). This should allow any future port to use whatever rendering they like, such as framebuffer, GDI, openGL, outputting to RGB leds... etc.

Feature: Keyboard Input

Keyboard input currently does not work.

To get this to work, we need to create a new input() function (currently in zxem.c) to handle IN calls.

The keyboard matrix feeds data from 5 different IN addresses:

Port	Bit
	4	3	2	1	0
&FEFE	Shift	Z	X	C	V
&FDFE	A	S	D	F	G
&FBFE	Q	W	E	R	T
&F7FE	1	2	3	4	5
&EFFE	6	7	8	9	0
&DFFE	P	O	I	U	Y
&BFFE	Enter	L	K	J	H
&7FFE	Space	Sym	M	N	B

These are polled on interrupt (1) every frame. The interrupts are already being called, but no data is being suppled, so the emulator is currently stuck at

(c) 1982 Sinclair Research Ltd.