# Fork of napple1

This forks enables to emulate keyboard entry on the apple1

This kludge is done by creating a "KBD.TXT" file. When pressing "shift-K",
the keyboard I/O will be replaced by the content of this file.

This have been done to be able to load basic programs and use the 'dump"
features to transfer them to binary files.




napple1 is an Apple 1 emulator using ncurses, ported from the SDL version 
Pom1 emulafor. If you have some questions, please report it as an issue. 

How to install on Ubuntu (ex. Ubuntu 22.04)
===========================================
1. sudo apt install make gcc libncurses-dev

2. git clone https://github.com/nobuh/napple1.git

3. Build
	cd napple1/src
	make
	cd ..
4. Run 
	./napple1

ROM Directory
======================
napple1 contain basic.rom and monitor.rom files on
the ./rom directory. However, If you want to put 
basic.rom and monitor.rom on another directory. 
Please use ROMDIR environmental variable.

For example, if you want to put basic.rom and monitor.rom 
on current directory, the command is:

    ROMDIR=. ./napple1

Default value of the ROMDIR is ./rom 
You can use an absolute path for the ROM Directory.

    ROMDIR=/home/username/my_rom_files ./napple1

How to uninstall
================
	cd napple1/src
	make clean

How to use programs on napple1
==============================

- Key map

In normal terminals, if you press 'D' key, it will be echoed as 'd' on screen.
And press 'Shift + D' prints 'D' on screen. Shift key works to flip caps. 

However, napple1, if you press 'D' key, it will be echoed 'D'. All letters 
you can type is upper case only. Because original apple1 has a limit to do so.
And shift key works like a control key in napple1.

- Cold start Apple 1 Basic

type E000R<enter>

- Warm start Apple 1 Basic

type E2B3R<enter>

- Emulator commands

Command      Key        Description
--------------------------------------------------------------------
Basic load   Shidt + B  Load rom/basic.rom to ram
Dump core    Shift + D  Dump memory to core/_file name_ 
Load core    Shift + L  Load memory from core/_file name_ 
Reset        Shift + R  Reset the emulator
Hard reset   Shidt + H  Reset & Clear memory
Quit         Shidt + Q  Quit the emulator
Mode         Shift + M  Mode change 8KB & 32KB ram mode

- Load / Save programs

To load or save program, please load or dump entire 64kb memory.

- napple1 memory map in memory.c

/*
 * Memory maap of napple1
 * 
 * Apple I 8K mode & napple1 64K mode, common usage
 * -----------------------------------------------------------------------
 * $0000           Ststem & User Space 
 * $0200 - $027F   Input Buffer used by monitor
 * $0FFF
 * -----------------------------------------------------------------------
 * $D010	KBD	Keyboard input register. b7 is always 1 by hardware.
 * 		Read KBD will automatcically clear KBDCR's b7.
 * $D011	KBDCR	When key is pressed, b7 is set by hardware.
 * $D012	DSP	Bit b6..b0 is output character for the terminal.
 *	        Writing to DSP will set b7 by hardware.
 *              The termianl clear b7 after the character is accepted.
 * $D013	DSPCR	Unused.
 * -----------------------------------------------------------------------
 * $E000        Apple I Integer BASIC
 * $E2B3        Re-entry address
 * $EFFF
 * -----------------------------------------------------------------------
 * $FF00        Monitor
 * $FFEF	Echo
 * $FFFF	
 * ----------------------------------------------------------------------- 
 */
/* Apple I 8K mode memory map
 * --------------------------------- 
 * Start Type
 * addr
 * --------------------------------- 
 * $0000 4KB RAM
 * $1000 unused
 * $D010 Display and Keyboard I/O
 * $D014 unused
 * $E000 4KB RAM
 * $F000 unused
 * $FF00 256B ROM^ (Woz Monitor)
 * ---------------------------------
 * ^ ROM can be written by Load core  
 */
/* napple I 32K mode memory map
 * --------------------------------- 
 * Start Type
 * addr
 * --------------------------------- 
 * $0000 32K RAM
 * $8000 unused
 * $D010 Display and Keyboard I/O
 * $D014 unused
 * $E000 8K ROM^ 
 * ---------------------------------
 * ^ ROM can be written by Load core  
 */