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Date Name Thumbnail Size User Description Versions
19:39, 8 March 2015 Terrordactyls gameplay screenshot.png (file) 692 bytes WikiSysop "The Terrordactyls" from ''Doctor Who: The First Adventure'' (BBC Soft, 1983) gameplay screenshot, showing a typical <code>MODE 1</code> display. 1
19:34, 8 March 2015 MODE 10 BBC demonstration.png (file) 898 bytes WikiSysop Demonstration of the unofficial "MODE 10" on the BBC Micro, developed by Ian Robertson and published in ''The Micro User'' magazine (November 1985, p.123). 1
19:42, 8 March 2015 Vortex gameplay screenshot.png (file) 970 bytes WikiSysop ''Vortex'' (Software Invasion, 1983) gameplay screenshot, showing a typical <code>MODE 4</code> display. 1
19:33, 8 March 2015 MODE 9 BBC demonstration.png (file) 974 bytes WikiSysop Demonstration of the unofficial "MODE 9" on the BBC Micro, developed by Ian Robertson and published in ''The Micro User'' magazine (November 1985, p.123). 1
19:19, 8 March 2015 Caterpillar gameplay screenshot.png (file) 1 KB WikiSysop Caterpillar (IJK Software, 1983) gameplay screenshot, showing a typical MODE 1 display. 1
19:38, 8 March 2015 Starship Command gameplay screenshot.png (file) 1 KB WikiSysop ''Starship Command'' (Acornsoft, 1983) gameplay screenshot, showing a typical <code>MODE 4</code> display. 1
19:27, 8 March 2015 Impact gameplay screenshot.png (file) 2 KB WikiSysop ''Impact!'' (Audiogenic, 1987) gameplay screenshot, showing a rich <code>MODE 5</code> display. 1
19:40, 8 March 2015 Text window.png (file) 2 KB WikiSysop Defining a text window in <code>MODE 4</code>, using <code>VDU 28</code>. The distances are measured in character cells, and always from the top left corner of the screen. The size of the character cells, and thus the window's position on the screen 1
19:36, 8 March 2015 Prison gameplay screenshot.png (file) 2 KB WikiSysop "The Prison" from ''Doctor Who: The First Adventure'' (BBC Soft, 1983) gameplay screenshot, showing a typical <code>MODE 2</code> display. 1
19:31, 8 March 2015 MODE 8 BBC demonstration.png (file) 2 KB WikiSysop Demonstration of the unofficial "MODE 8" on the BBC Micro, developed by Ian Robertson and published in ''The Micro User'' magazine (November 1985, p.123). An alternative example is found in ''The Advanced User Guide for the BBC Microcomputer'' (Bray, D... 1
21:14, 12 October 2016 MODE 9 (BBC) demonstration.png (file) 2 KB Jgharston   1
20:55, 12 October 2016 MODE 10 (BBC) demonstration.png (file) 2 KB Jgharston   2
19:28, 8 March 2015 Inter-word editing screen detail.png (file) 2 KB WikiSysop Detail of a text file being edited in ''Inter-Word'' (Computer Concepts, 1986), showing a typical <code>MODE 0</code> display. 1
19:23, 8 March 2015 EDOS help screen plus red background.png (file) 2 KB WikiSysop Portion of <samp>*HELP</samp> output of ''Opus EDOS'' (Alan Williams, 1984), in a <code>MODE 6</code> text-only display. A red background has previously been selected, to show the 'Venetian blind' effect of the non-addressable blank scanlines inserte 1
19:41, 8 March 2015 User defined stick figure.png (file) 2 KB WikiSysop Defining a user character with <code>VDU 23</code>. This bitmap can be assigned to character 224 using the following statement: <pre>VDU 23,224,28,28,8,127,8,20,34,65</pre> Regregex 20:43, 13 December 2007 (UTC) 1
19:18, 8 March 2015 Auto Beebaid help screen plus blue background detail.png (file) 2 KB WikiSysop Detail of help screen of Auto BeebAid (Jaysoft, 1985), in a MODE 4 text-only display. A blue background has previously been selected, to show the 'Venetian blind' effect of the non-addressable blank scanlines inserted in MODE 4. 1
19:25, 8 March 2015 Graphics window.png (file) 2 KB WikiSysop Defining a graphics window using <code>VDU 24</code>. The distances are actually measured from the graphics origin, which is in its default position at the bottom left corner of the screen. The BASIC command to define this window is: <code>VDU 23,left;... 1
19:37, 8 March 2015 Serial ULA pinout.png (file) 2 KB WikiSysop Pinout of the VLSI Serial Processor, VC 2026/201647. The Ferranti Serial ULA is pin-compatible but lacks frequency level inversion. Based on scans of the BBC Micro circuit diagram formerly archived at The BBC Lives! 1
19:24, 8 March 2015 Frak gameplay screenshot.png (file) 2 KB WikiSysop ''Frak!'' (Aardvark, 1984) gameplay screenshot, showing a typical <code>MODE 1</code> display. 1
21:12, 7 October 2017 Video ULA pinout.png (file) 3 KB Regregex corrected pins 15, 16 to V2, V1 2
19:29, 8 March 2015 Inter-Word editing screen.png (file) 3 KB WikiSysop A text file being edited in ''Inter-Word'' (Computer Concepts, 1986), showing a typical <code>MODE 0</code> display. 2
19:24, 8 March 2015 Exile gameplay tallscreen.png (file) 3 KB WikiSysop ''Exile'' (Superior Software, 1988) gameplay screenshot, showing a rich <code>MODE 2</code> display. This is from the 6502 Second Processor enhanced version, with taller viewing area. 1
19:39, 8 March 2015 Street Machine gameplay screenshot.png (file) 4 KB WikiSysop ''Street Machine'' (Software Invasion, 1986) gameplay screenshot, showing a rich <code>MODE 2</code> display. 1
10:21, 14 September 2020 EliteScreen.gif (file) 4 KB Cverrier BBC Elite gameplay 1
18:17, 12 October 2016 MODE 11 (BBC) demonstration.gif (file) 4 KB Jgharston   1
13:13, 9 October 2016 MODE 8 (BBC) demonstration.gif (file) 4 KB Jgharston   1
19:21, 8 March 2015 DDOS disc catalogue format z.png (file) 4 KB WikiSysop Diagram of the byte assignments in the disc catalogue of an Opus DDOS disc. Theoretically all fields extend to the top of the byte, but here they are shown with the limits that apply to real discs. The first track field of a volume is set to 0 if the vol 1
19:38, 8 March 2015 Space Invaders gameplay screenshot.png (file) 4 KB WikiSysop ''Space Invaders'' (Acornsoft, 1982) gameplay screenshot, showing a colourful MODE 7 graphics display. 1
18:12, 12 October 2016 MODE 14 (BBC) demonstration.gif (file) 4 KB Jgharston   1
03:09, 13 October 2016 MODE 13 (BBC) demonstration.gif (file) 5 KB Jgharston   5
02:06, 13 October 2016 MODE 12 (BBC) demonstration.gif (file) 5 KB Jgharston   1
20:42, 14 May 2020 DDOS disc catalogue format.png (file) 5 KB Regregex Reverted to version as of 21:36, 13 December 2015: byte 0 is configuration/version number as per manual 4
19:17, 8 March 2015 Auto Beebaid help screen plus blue background.png (file) 5 KB WikiSysop Help screen of Auto BeebAid (Jaysoft, 1985), in a MODE 4 text-only display. A blue background has previously been selected, to show the 'Venetian blind' effect of the non-addressable blank scanlines inserted in MODE 4. 1
01:08, 15 August 2016 Basicstack.gif (file) 5 KB Jgharston Demonstration of location of BASIC stack. 2
03:08, 13 October 2016 MODE 9 (BBC) demonstration.gif (file) 6 KB Jgharston   2
19:40, 8 March 2015 Tomcat gameplay screenshot.png (file) 7 KB WikiSysop ''Tomcat'' (Players, 1989) gameplay screenshot, showing a rich <code>MODE 4</code> display. 1
19:42, 8 March 2015 Video ULA serialisation block diagram.png (file) 8 KB WikiSysop Block diagram equivalent to the video generation function of the Video ULA in <code>MODE</code>s 0–6. In <code>MODE 7</code> the ULA repeats the RGB Teletext inputs, not shown. My own work. 1
19:36, 8 March 2015 Screwball intro screenshot.png (file) 9 KB WikiSysop ''Screwball'' (MRM Software, 1984) intro screenshot, showing a colourful <code>MODE 7</code> text display. 1
19:22, 8 March 2015 DFS catalogue format.png (file) 12 KB WikiSysop Layout of the fields in an Acorn DFS catalogue. The disc, and each of the 31 files, are assigned 8 bytes in each of the two catalogue sectors. White rectangles mark unallocated bits that should be set to zero. Cream rectangles are for bits used by third 1
23:37, 12 October 2016 Teletext Engineering Test Page.png (file) 12 KB Jgharston   2
19:22, 8 March 2015 DDOS volume catalogue format.png (file) 12 KB WikiSysop Diagram of byte assignments in the volume A catalogue of an Opus DDOS disc. The catalogues of volumes B to H occupy sectors 2 to 15. My own work. Regregex 04:00, 9 April 2008 (BST) 1
19:27, 8 March 2015 High density screenshot.jpg (file) 18 KB WikiSysop Screenshot of an extensively-patched ''Opus EDOS'' (Alan Williams, 1984) partitioning and cataloguing a high-density disc. Taken shortly after the first successful test on 11 July 2009. 1
19:35, 8 March 2015 Nmi rdio 16us check.png (file) 21 KB WikiSysop Extended timing diagrams for the worst case of reading to I/O memory. NMIs must be no less than 16 − ε µs apart. The ε (epsilon) means that in the worst case the NMIs will just miss one decision point and just catch the next. There are two CPU timing 1
19:37, 8 March 2015 Serial ULAs.jpg (file) 22 KB WikiSysop The two pin-compatible serial processors used in the BBC Micro and Master series: the Ferranti Serial ULA (2C199E-7, top) and the VLSI Serial Processor or SERPROC (VC2026/201648, bottom). There was a subtle difference in the functionality of the chips. 1
11:52, 12 September 2020 BBC-Micro User issue 1.jpg (file) 24 KB Cverrier Front cover of BBC Micro User magazine Issue 1 1
22:43, 13 December 2015 OSWRCH output fanout.png (file) 25 KB Regregex Code points and intercept box 2
19:19, 8 March 2015 BBC Micro orientation.jpg (file) 27 KB WikiSysop Illustration of the conventional 'compass points' of the BBC Micro's motherboard, referenced in service literature. Does not necessarily apply to daughterboards or to the power supply board. 1
13:10, 14 September 2020 6502SecondProcessor.jpg (file) 29 KB Cverrier 6502 Second Processor 1
12:49, 13 September 2020 ElectronPlus1.jpg (file) 30 KB Cverrier Acorn Plus One expansion module 2
13:18, 14 September 2020 AcornTeletextAdapter.jpg (file) 31 KB Cverrier Acorn Teletext Adaptor 1
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