The Tube interface allowed Acorn to use BBC Micros with ARM CPUs as software development machines when creating the Acorn Archimedes. This resulted in the ARM development kit for the BBC Micro in 1986, priced at around 4000.[46] From 2006, a kit with an ARM7TDMI CPU running at 64 MHz, with as much as 64 MB of RAM, was released for the BBC Micro and Master, using the Tube interface to upgrade the 8-bit micros into 32-bit RISC machines.[47] Among the software that operated on the Tube are an enhanced version of the Elite video game and a computer-aided design system that requires a second 6502 CPU and a 3-dimensional joystick named a "Bitstik"[1].
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The Model A and the Model B are built on the same printed circuit board (PCB), and a Model A can be upgraded to a Model B. Users wishing to operate Model B software need to add the extra RAM and the user/printer MOS Technology 6522 VIA (which many games use for timers) and snip a link, a task that can be achieved without soldering. To do a full upgrade with all the external ports requires soldering the connectors to the motherboard. The original machines shipped with "OS 0.1", with later updates advertised in magazines, supplied as a clip-in integrated circuit, with the last official version being "OS 1.2". Variations in the Acorn OS exist as a result of home-made projects and modified machines can still be bought on internet auction sites such as eBay as of 2011.
In mid-1985, Acorn introduced the Model B+ which increased the total RAM to 64 KB. This had a modest market impact and received a rather unsympathetic reception, with one reviewer's assessment being that the machine was "18 months too late" and that it "must be seen as a stop gap",[57] and others criticising the elevated price of 500 (compared to the 400 of the original Model B) in the face of significantly cheaper competition providing as much or even twice as much memory.[58] The extra RAM in the Model B+ is assigned as two blocks, a block of 20 KB dedicated solely for screen display (so-called shadow RAM) and a block of 12 KB of special sideways RAM. The B+128, introduced towards the end of 1985,[59] comes with an additional 64 KB (4 16 KB sideways RAM banks) to give a total RAM of 128 KB.
The B+ is incapable of operating some original BBC B programs and games, such as the very popular Castle Quest. A particular problem is the replacement of the Intel 8271 floppy-disk controller[60] with the Western Digital 1770: not only was the new controller mapped to different addresses,[61] it is fundamentally incompatible and the 8271 emulators that existed were necessarily imperfect for all but basic operation.[62] Software that use copy protection techniques involving direct access to the controller do not operate on the new system.[63] Acorn attempted to alleviate this, starting with version 2.20 of the 1770 DFS, via an 8271-backward- compatible .mw-parser-output .keyboard-keyborder:1px solid #aaa;border-radius:0.2em;box-shadow:0.1em 0.1em 0.2em rgba(0,0,0,0.1);background-color:#f9f9f9;background-image:linear-gradient(to bottom,#eee,#f9f9f9,#eee);color:#000;padding:0.1em 0.3em;font-family:inherit;font-size:0.85emCtrl+Z+Break option.[64]
During 1986, Acorn followed up with the BBC Master, which offers memory sizes from 128 KB and many other refinements which improves on the 1981 original. It has essentially the same 6502-based BBC architecture, with many of the upgrades that the original design intentionally makes possible (extra ROM software, extra paged RAM, second processors) now included on the circuit board as internal plug-in modules.
The BBC Micro platform amassed a large software base of both games and educational programs for its two main uses as a home and educational computer. Notable examples of each include the original release of Elite[65] and Granny's Garden. Programming languages and some applications were supplied on ROM chips to be installed on the motherboard. These load instantly and leave the RAM free for programs or documents.
The built-in operating system, Acorn MOS, provides an extensive API to interface with all standard peripherals, ROM-based software, and the screen.[66] Features specific to some versions of BASIC, like vector graphics, keyboard macros, cursor-based editing, sound queues, and envelopes, are in the MOS ROM and made available to any application. BBC BASIC itself, being in a separate ROM, can be replaced with another language.
Acorn strongly discouraged programmers from directly accessing the system variables and hardware, favouring official system calls.[68] This was ostensibly to make sure programs keep working when migrated to coprocessors that utilise the Tube interface, but it also makes BBC Micro software more portable across the Acorn range. Whereas untrappable PEEKs and POKEs are used by other computers to reach the system elements,[69] programs in either machine code or BBC BASIC instead pass parameters to an operating system routine. In this way the 6502 can translate the request for the local machine or send it across the Tube interface, as direct access is impossible from the coprocessor. Published programs largely conform to the API except for games, which routinely engage with the hardware for greater speed, and require a particular Acorn model.
Many schools and universities employed the machines in Econet networks, and so networked multiplayer games were possible. Few became popular, due to the limited number of machines aggregated in one place. A relatively late but well documented example can be found in a dissertation based on a ringed RS-423 interconnect.[70]
The speech upgrade also added two empty sockets next to the keyboard, intended for 16 KB serial ROM cartridges containing either extra speech phoneme data beyond that held in the speech paged ROM or general software accessed through the ROM Filing System. The original plan was that some games would be released on cartridges, but due to the limited sales of the speech upgrade combined with economic and other viability concerns,[96] little or no software was ever produced for these sockets. The cut-out space next to the keyboard (nicknamed the "ashtray") was more commonly used to install other upgrades, such as a ZIF socket for conventional paged ROMs.[citation needed]
The BBC Micro was used extensively to provide graphics and sound effects for many early 1980s BBC TV shows. These included, notably, series 3 and 4 of The Adventure Game;[99] the children's quiz game "First Class" (where the onscreen scoreboard was provided by a BBC Micro nicknamed "Eugene"); and numerous 1980s episodes of Doctor Who including "Castrovalva", "The Five Doctors", and "The Twin Dilemma".
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J2ME Loader is high compatible and capable of playing thousands of J2ME games (Runs almost every Nokia games, especially Gameloft games), more than 96.8% of the J2ME library with supports 2D games and also 3D with Mascot Capsule 3D games. Converts .JAR and .KJX files offline using its own resources. Easily launches both 2D & 3D apps. Samsung & Nokia API implemented. Supports different keyboard layouts and customization. It is highly accurate, with the right frame rate for each game, as well as vibration. Has slightly improved performance through hardware acceleration, but games won't run too fast. Runs almost every Nokia game, even ones that don't work with KEmulator or FreeJ2ME
Shaders are GPU microprograms that affect the game in one way or another in order to improve it or replicate the visual features of some on-screen devices, such as displays on portable consoles or old tube TVs. Shaders can significantly alter the game, but also reduce performance. In addition, shaders can have customizable parameters, if there are such an icon for accessing them will be displayed on the far right side and opposite the name of the selected shader.
Supports the same shader format as PPSSPP To use, you need to put them in the shaders folder in the working directory of the emulator, then in the game profile, select the graphics output mode: Hardware acceleration (OpenGL ES) and select the desired shader. Some shaders have settings - when you select one, an icon will appear next to the name, when you click on it, a window with settings will open A small collection of compatible shaders can be found Here
If the Scaled Pixel Sizes check box is selected , the specified dimensions will be adjusted by Android to provide the same visible text size on screens with different resolutions. It is recommended to enable this setting when using virtual screen resolutions of more than 240x320 pixels.
In some games (seen in "Medal of Honor") the 3D scene may not be displayed due to the overlap with the 2D background. Try adding the following line to the "System Properties" field: micro3d.v3.render.no-mix2D3D: true
Mascot Capsule is a proprietary 3D engine developed by Hi Corporation (Japan), written in C and compiled for all platforms known at the time. It was mostly used in Japanese devices such as i-mode, J-PHONE, EZweb, and others, but it also made it overseas featured in many Sony Ericsson and Motorola devices. Many developers made use of this tech to bring higher quality 3D graphics on the Sony Ericsson version of their J2ME games.
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