From 1575d4f53805f177474b5bb96daebede9b2dfb73 Mon Sep 17 00:00:00 2001 From: root Date: Wed, 24 Feb 2021 23:45:58 +0000 Subject: base --- docs/os12/mdfs.net/Docs/Comp/BBC/OS1-20/index.html | 80 ++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 docs/os12/mdfs.net/Docs/Comp/BBC/OS1-20/index.html (limited to 'docs/os12/mdfs.net/Docs/Comp/BBC/OS1-20/index.html') diff --git a/docs/os12/mdfs.net/Docs/Comp/BBC/OS1-20/index.html b/docs/os12/mdfs.net/Docs/Comp/BBC/OS1-20/index.html new file mode 100644 index 0000000..fe01700 --- /dev/null +++ b/docs/os12/mdfs.net/Docs/Comp/BBC/OS1-20/index.html @@ -0,0 +1,80 @@ + + + + + +BBC OS 1.20 - BBC FAQ + + + + + +
BBC OS 1.20 DISASSEMBLY
BBC->OS1-20 + +Search +

+ +These files were originally abritarily chopped up into approximately +18K chunks just for ease of editing. I have rearranged them up into +more logical function chunks. I am going through them and updating, +correcting and clarifying the comments. + +

+C000   +Default character set.
+C300   +VDU startup entry and tables.
+C4C0   +VDU Part 1: Main Routine. Control character dispatch,
+       VDU 1,14,2,21,3,15,4,5,8, scroll text window, VDU 11,9,10,28.
+C735   +VDU Part 2: Read pixel, read pallette, +VDU 12,30,31,13,16,17,18,20,19
+       write pallette, VDU 22,23,cursor control, CRTC control, VDU 25,26.
+CA39   +VDU Part 3: VDU 24,29,127,paged mode,initialisation,
+       read character, clear screen, *FX20, block cursor.
+CDED   +VDU Part 4: Scroll, clear, move graphics cursor, plot routines,
+       plot a point.
+D10D   VDU Part 5
+D4BF   VDU Part 6
+D940   +System Startup. Default vectors, RESET code, find ROMs and BASIC,
+       initialise ROMs, enter a language.
+DC1C   Main IRQ Routines.
+DF0C   OSCLI and OSWRCH dispatch.
+E20E   +*SAVE, *LOAD, *SPOOL, *KEY, *FX.
+E435   +Buffer handling, Event handling.
+E6B0   +OSBYTE/OSWORD dispatch table, FX9/10, FX2, FX13/14, FX16, INKEY,
+       ADVAL, OSBYTE handler, OSWORD handler, OSWORD 5/6, FX0.
+E887   +Sound system, SOUND, Speech, BELL, ENVELOPE,
+       OSWORD 3,1,2,0,5 FX1,6,12,11,3,4,166+ FX19,160,18,118, GSTrans.
+EAD9   +BIV, *TV, Sound IRQs, Speech.
+EEDA   +Keyboard.
+F135   +ROM/Cassette filing system. ARGS, FSC, FILE, RUN, CAT. Pass service calls around ROMs
+F3CA   +ROM/Cassette filing system. Save data, FIND, BGET, BPUT, OPT, EOF.
+F68B   +ROM/Cassette filing system. Read/write blocks, CRC checks.
+F9B4   +ROM/Cassette filing system. Load data, housekeeping.
+FC00   +I/O locations, extended vector handler, MOS entry points.
+Microbase   +Introduction to the BBC Operating System.
+ + +
+
This page last updated 11-Aug-2010
+ + + -- cgit v1.2.3