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descDate Name Thumbnail Size User Description Versions
21:12, 7 October 2017Video ULA pinout.png (file)3 KBRegregexcorrected pins 15, 16 to V2, V12
03:09, 13 October 2016MODE 13 (BBC) demonstration.gif (file)5 KBJgharston 5
03:08, 13 October 2016MODE 9 (BBC) demonstration.gif (file)6 KBJgharston 2
02:06, 13 October 2016MODE 12 (BBC) demonstration.gif (file)5 KBJgharston 1
23:37, 12 October 2016Teletext Engineering Test Page.png (file)12 KBJgharston 2
21:14, 12 October 2016MODE 9 (BBC) demonstration.png (file)2 KBJgharston 1
20:55, 12 October 2016MODE 10 (BBC) demonstration.png (file)2 KBJgharston 2
18:17, 12 October 2016MODE 11 (BBC) demonstration.gif (file)4 KBJgharston 1
18:12, 12 October 2016MODE 14 (BBC) demonstration.gif (file)4 KBJgharston 1
13:13, 9 October 2016MODE 8 (BBC) demonstration.gif (file)4 KBJgharston 1
01:08, 15 August 2016Basicstack.gif (file)5 KBJgharstonDemonstration of location of BASIC stack.2
19:41, 22 February 2016PDP11 BBC BASIC.jpg (file)66 KBJgharstonReverted to version as of 22:05, 15 February 20163
14:49, 14 February 2016Mode7vsTeletext.png (file)86 KBLurkio 2
18:32, 2 February 201680286copro.jpeg (file)290 KBLurkiodownsized2
22:43, 13 December 2015OSWRCH output fanout.png (file)25 KBRegregexCode points and intercept box2
22:36, 13 December 2015DDOS disc catalogue format.png (file)5 KBRegregexcorrect image2
19:42, 8 March 2015Vortex gameplay screenshot.png (file)970 BWikiSysop''Vortex'' (Software Invasion, 1983) gameplay screenshot, showing a typical <code>MODE 4</code> display.1
19:42, 8 March 2015Video ULA serialisation block diagram.png (file)8 KBWikiSysopBlock 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
19:41, 8 March 2015User defined stick figure.png (file)2 KBWikiSysopDefining 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
19:40, 8 March 2015Tomcat gameplay screenshot.png (file)7 KBWikiSysop''Tomcat'' (Players, 1989) gameplay screenshot, showing a rich <code>MODE 4</code> display.1
19:40, 8 March 2015Text window.png (file)2 KBWikiSysopDefining 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 screen1
19:39, 8 March 2015Terrordactyls gameplay screenshot.png (file)692 BWikiSysop"The Terrordactyls" from ''Doctor Who: The First Adventure'' (BBC Soft, 1983) gameplay screenshot, showing a typical <code>MODE 1</code> display.1
19:39, 8 March 2015Street Machine gameplay screenshot.png (file)4 KBWikiSysop''Street Machine'' (Software Invasion, 1986) gameplay screenshot, showing a rich <code>MODE 2</code> display.1
19:38, 8 March 2015Starship Command gameplay screenshot.png (file)1 KBWikiSysop''Starship Command'' (Acornsoft, 1983) gameplay screenshot, showing a typical <code>MODE 4</code> display.1
19:38, 8 March 2015Space Invaders gameplay screenshot.png (file)4 KBWikiSysop''Space Invaders'' (Acornsoft, 1982) gameplay screenshot, showing a colourful MODE 7 graphics display.1
19:37, 8 March 2015Serial ULAs.jpg (file)22 KBWikiSysopThe 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
19:37, 8 March 2015Serial ULA pinout.png (file)2 KBWikiSysopPinout 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
19:36, 8 March 2015Screwball intro screenshot.png (file)9 KBWikiSysop''Screwball'' (MRM Software, 1984) intro screenshot, showing a colourful <code>MODE 7</code> text display.1
19:36, 8 March 2015Prison gameplay screenshot.png (file)2 KBWikiSysop"The Prison" from ''Doctor Who: The First Adventure'' (BBC Soft, 1983) gameplay screenshot, showing a typical <code>MODE 2</code> display.1
19:35, 8 March 2015NMI timing diagram.png (file)39 KBWikiSysopDiagram of worst case timings of interrupt service routines for quad density floppy disc access. According to Sonninen et al. in "64doc", to interrupt the next instruction the NMI must arrive before the last cycle of the current instruction. Thus, in the1
19:35, 8 March 2015Nmi rdio 16us check.png (file)21 KBWikiSysopExtended 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 timing1
19:34, 8 March 2015MODE 10 BBC demonstration.png (file)898 BWikiSysopDemonstration 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
19:33, 8 March 2015MODE 9 BBC demonstration.png (file)974 BWikiSysopDemonstration 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
19:31, 8 March 2015MODE 8 BBC demonstration.png (file)2 KBWikiSysopDemonstration 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
19:29, 8 March 2015Inter-Word editing screen.png (file)3 KBWikiSysopA text file being edited in ''Inter-Word'' (Computer Concepts, 1986), showing a typical <code>MODE 0</code> display.2
19:28, 8 March 2015Inter-word editing screen detail.png (file)2 KBWikiSysopDetail of a text file being edited in ''Inter-Word'' (Computer Concepts, 1986), showing a typical <code>MODE 0</code> display.1
19:27, 8 March 2015Impact gameplay screenshot.png (file)2 KBWikiSysop''Impact!'' (Audiogenic, 1987) gameplay screenshot, showing a rich <code>MODE 5</code> display.1
19:27, 8 March 2015High density screenshot.jpg (file)18 KBWikiSysopScreenshot 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
19:26, 8 March 2015High density modified board.jpg (file)120 KBWikiSysopTop side of an Opus EO 118 floppy drive controller daughterboard for the BBC Micro, modified to enable high-density access.1
19:25, 8 March 2015Graphics window.png (file)2 KBWikiSysopDefining 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
19:24, 8 March 2015Frak gameplay screenshot.png (file)2 KBWikiSysop''Frak!'' (Aardvark, 1984) gameplay screenshot, showing a typical <code>MODE 1</code> display.1
19:24, 8 March 2015Exile gameplay tallscreen.png (file)3 KBWikiSysop''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
19:23, 8 March 2015EDOS help screen plus red background.png (file)2 KBWikiSysopPortion 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 inserte1
19:22, 8 March 2015DFS catalogue format.png (file)12 KBWikiSysopLayout 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 third1
19:22, 8 March 2015DDOS volume catalogue format.png (file)12 KBWikiSysopDiagram 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
19:21, 8 March 2015DDOS disc catalogue format z.png (file)4 KBWikiSysopDiagram 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 vol1
19:19, 8 March 2015Caterpillar gameplay screenshot.png (file)1 KBWikiSysopCaterpillar (IJK Software, 1983) gameplay screenshot, showing a typical MODE 1 display.1
19:19, 8 March 2015BBC Micro orientation.jpg (file)27 KBWikiSysopIllustration 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
19:18, 8 March 2015Auto Beebaid help screen plus blue background detail.png (file)2 KBWikiSysopDetail 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
19:17, 8 March 2015Auto Beebaid help screen plus blue background.png (file)5 KBWikiSysopHelp 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