New release R2.8.2: fixed a bug caused by changes introduces with pre…

…vious R2.8.1 that lead to wrong functioning of several BASIC statements (LOCATE, VOLUME, etc..), keyboard input, system tick counter, and other.

12-Home computer/LM80C-firmware-r282.asm

@@ -0,0 +1,94 @@
+; ------------------------------------------------------------------------------
+; LM80C - FIRMWARE - R2.8.2
+; ------------------------------------------------------------------------------
+; The following code is intended to be used with LM80C Z80-based computer
+; designed by Leonardo Miliani. More info at
+; www DOT leonardomiliani DOT com
+; ------------------------------------------------------------------------------
+; Coding/Editing/Compiling:
+; Original init code for MC68B05 by Grant Searle
+; Original SIO/CTC/PIO init code by Mario Blunk
+; NASCOM BASIC originally modified by Gran Searle
+; Code modified and adapted for LM80C by Leonardo Miliani
+;
+; Edited with Atom Editor
+;
+; Compiled with ZASM assembler 4.2.4
+; https://k1.spdns.de/Develop/Projects/zasm-4.0/Distributions/
+; ------------------------------------------------------------------------------
+; Copyright notes:
+; Parts of the code (c) Grant Searle - free for non commercial use
+; Please include this advice and the note to the attribution of the original
+; version to Grant Searle if you intend to redistribuite it
+; http://searle.hostei.com/grant/index.html
+; eMail: home.micros01@btinternet.com
+;
+; Parts of the code (c) Mario Blunk
+; http://www.train­z.de
+;
+; NASCOM ROM BASIC Ver 4.7, (C) 1978 Microsoft
+; Scanned from source published in 80-BUS NEWS from Vol 2, Issue 3
+; (May-June 1983) to Vol 3, Issue 3 (May-June 1984)
+; Adapted for the freeware Zilog Macro Assembler 2.10 to produce
+; the original ROM code (checksum A934H). PA
+;
+; Parts of the code by Leonardo Miliani
+; www DOT leonardomiliani DOT com
+; ------------------------------------------------------------------------------
+; Code Revision:
+; R1.3   - 20190521 - Added preliminary support for video cursor management
+; R1.4   - 20190524 - Added scrolling capabilities
+; R1.5   - 20190525 - Added backspace functionality
+; R1.6   - 20190601 - Fixed scrolling bugs
+; R1.7   - 20190606 - Added "screen" command; code revision
+; R1.8   - 20190615 - Better cursor integration; added VPOKE & VPEEK statements; 6x8 & 8x8 fonts
+; R1.9   - 20190620 - New VREG, VSTAT, & LOCATE statement; 8x8 pixels font completed
+; R2.0   - 20190714 - Added SREG & SSTAT to write to/read from PSG
+; R2.1   - 20190818 - Added SOUND command to play simple tones and VOLUME command
+; R2.1a  - 20190908 - Cursor management improvements
+; R2.2   - 20190920 - Fixed cursor bug within SCREEN statement; new command PAUSE
+; R2.3   - 20190930 - Fixed bugs in SOUND command
+; R2.4   - 20191013 - Added new graphic chars and reorganized previous ones
+; R2.4a  - 20191015 - More graphic chars
+; R2.5   - 20191026 - Revision of init PSG code; revision of serial buffer exp. code;
+;                     fixed a bug into the video buffer manager
+; R2.6   - 20191102 - New function INKEY to read a key without a prompt;
+;                     source code cleaning
+; R2.7   - 20191116 - Fixed a bug into the INKEY code
+; R2.8   - 20191207 - Minor bug fixes; added support for built-in keyboard;
+;                     revision of some char codes;
+; R2.8.1 - 20191208 - Introduced support for SHIFT key for uppercase letters & alternate chars
+; R2.8.2 - 20xxxxxx - Fixed a bug into the system tick counter code;
+;
+; -----------------------------------------------------------------------------
+
+; this line instructs the assembler to prepare a file for a ROM target
+; meaning that blank cells will be filled up with 0xff
+#target rom
+
+; this line instructs the assembler to compile taking account that code
+; starts at $0000 (the address reached by Z80 upon reset)
+#code BOOT, 0000h
+
+; ------------------------------------------------------------------------------
+; include the latest version of the bootloader: this sets up the address aliases
+; configure the hardware, checks if warm or cold startup and loads the BASIC interpreter
+#include "../include/bootloader/bootloader-r282.asm"
+
+; incude the latest version of the VDP module
+#include "../include/vdp/vdp-r282.asm"
+
+; incude the latest version of the PSG module
+#include "../include/psg/psg-r282.asm"
+
+; include the latest version of the NASCOM BASIC interpreter
+#include "../include/basic/basic32k-r282.asm"
+
+; include the latest version of the font sets
+#include "../include/vdp/6x8fonts.asm"
+#include "../include/vdp/8x8fonts-r15.asm"
+
+; END OF ASSEMBLY SOURCE
+#end
+
+;-------------------------------------------------------------------------------