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<title>MOS Technology 6507</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">MOS Technology 6507</span></span>

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</style><table class="infobox"><caption class="infobox-title">MOS Technology 6507</caption><tbody><tr><td colspan="2" class="infobox-image"></td></tr><tr><th colspan="2" class="infobox-header">General information</th></tr><tr><th scope="row" class="infobox-label">Launched</th><td class="infobox-data">1975<span style="display:none"> (<span class="bday dtstart published updated">1975</span>)</span></td></tr><tr><th scope="row" class="infobox-label">Common manufacturer</th><td class="infobox-data"><style data-mw-deduplicate="TemplateStyles:r1126788409">

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</style><div class="plainlist"><ul><li><a href="MOS_Technology" title="MOS Technology">MOS Technology</a></li></ul></div></td></tr><tr><th colspan="2" class="infobox-header">Performance</th></tr><tr><th scope="row" class="infobox-label">Data width</th><td class="infobox-data">8</td></tr><tr><th scope="row" class="infobox-label">Address width</th><td class="infobox-data">13</td></tr><tr><th colspan="2" class="infobox-header">Architecture and classification</th></tr><tr><th scope="row" class="infobox-label"><a href="Instruction_set_architecture" title="Instruction set architecture">Instruction set</a></th><td class="infobox-data"><a href="MOS_Technology_6502" title="MOS Technology 6502">6502</a></td></tr><tr><th scope="row" class="infobox-label">Number of instructions</th><td class="infobox-data">56</td></tr><tr><th colspan="2" class="infobox-header">Physical specifications</th></tr><tr><th scope="row" class="infobox-label"><a href="Transistor_count" title="Transistor count">Transistors</a></th><td class="infobox-data"><div class="plainlist"><ul><li>3,510,<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> 3,218<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></li></ul></div></td></tr><tr><th scope="row" class="infobox-label">Package</th><td class="infobox-data"><div class="plainlist"><ul><li>28-pin <a href="Dual_in-line_package" title="Dual in-line package">DIP</a></li></ul></div></td></tr><tr><th colspan="2" class="infobox-header">History</th></tr><tr><th scope="row" class="infobox-label">Predecessors</th><td class="infobox-data"><div class="plainlist">

<ul><li><a href="Motorola_6800" title="Motorola 6800">Motorola 6800</a></li>

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<p>The <b>6507</b> (typically "<i>sixty-five-oh-seven</i>" or "<i>six-five-oh-seven</i>") is an 8-bit <a href="Microprocessor" title="Microprocessor">microprocessor</a> from <a href="MOS_Technology" title="MOS Technology">MOS Technology, Inc.</a> It is a version of their 40-pin <a href="MOS_Technology_6502" title="MOS Technology 6502">6502</a> packaged in a 28-pin <a href="Dual_inline_package" class="mw-redirect" title="Dual inline package">DIP</a>, making it cheaper to package and integrate in systems.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> The reduction in pin count is achieved by reducing the <a href="Address_bus" class="mw-redirect" title="Address bus">address bus</a> from 16 bits to 13 (limiting the available memory range from 64<span class="nowrap"> </span><a href="Kilobyte" title="Kilobyte">KB</a> to 8<span class="nowrap"> </span>KB) and removing a number of other pins used only for certain applications.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>

</p><p>To do this, A15 to A13 and some other signals such as the interrupt lines are not accessible. As a result, it can only address 8<span class="nowrap"> </span>KB of memory, which for some applications at the time (1975) was acceptable and not overly restrictive. The entire 6500 CPU family was originally conceived as a line of very low-cost microprocessors for small-scale embedded systems.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup>

</p><p>The 6507 and 6502 chips use the same underlying silicon layers, and differ only in the final metallisation layer. This ties the interrupt lines to their inactive level so they are not vulnerable to generating spurious interrupts from noise. The first three digits of the chip identifier are part of the silicon layers, and the final digit is in the metallisation layer. Micro-photography of the 6502 and 6507 shows this difference.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup>

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<p>The 6507 is widely used in two applications: the best-selling <a href="Atari_2600" title="Atari 2600">Atari 2600</a> <a href="Video_game_console" title="Video game console">video game console</a><sup id="cite_ref-EGM62_7-0" class="reference"><a href="#cite_note-EGM62-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> and peripherals for the <a href="Atari_8-bit_computers" title="Atari 8-bit computers">Atari 8-bit computers</a> including the <a href="Atari_850" class="mw-redirect" title="Atari 850">850</a> Serial & Parallel Interface,<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> and the <a href="Atari_810" title="Atari 810">810</a> and <a href="Atari_1050" title="Atari 1050">1050</a> disk drives.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> In the 2600, the system is further limited by the design of the <a href="ROM_cartridge" title="ROM cartridge">ROM cartridge</a> slot, which only allows for 4<span class="nowrap"> </span>KB of the external memory to be addressed. The other 4<span class="nowrap"> </span>KB is reserved for the internal <a href="Random-access_memory" title="Random-access memory">RAM</a> and I/O chips, using a minimal-cost <a href="Memory-mapped_I/O" class="mw-redirect" title="Memory-mapped I/O">partial decoding</a> technique that causes the RAM and peripheral device registers to appear at multiple aliased addresses throughout the 4<span class="nowrap"> </span>K address space.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup>

</p><p>Most other machines, notably <a href="Home_computer" title="Home computer">home computers</a> based on the <a href="MOS_Technology_650x" class="mw-redirect" title="MOS Technology 650x">650x architecture</a>, use either the standard 6502 or extended versions of it, in order to allow for more memory.

</p><p>By the time the 6502 line was becoming widely used around 1980, <a href="Read-only_memory" title="Read-only memory">ROM</a> and RAM <a href="Semiconductor" title="Semiconductor">semiconductor</a> memory prices had fallen to the point where the 6507 was no longer a worthwhile simplification. Its use in new designs ceased at that point, though the Atari 2600 that contains it continued to be sold into the early 1990s, as it was not discontinued until January 1, 1992. However, late-model Atari 2600 consoles do not necessarily contain a discrete 6507 chip.

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<div class="mw-heading mw-heading2"><h2 id="Pin_configuration">Pin configuration</h2></div>

<caption>Pin layout of MOS 6507<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup>

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<td><a href="Clock_signal" title="Clock signal">φ2</a> out

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<td><a href="Clock_signal" title="Clock signal">φ0</a> in

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<td>R/W

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<td>D0

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<td>D1

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<td>D2

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<td>D3

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<td>D4

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<td>D5

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<td>D6

</td></tr>

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<td>D7

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<td>A12

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<td>A11

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<td>A10

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<p>The 6507 uses a 28-pin configuration, with 13 address pins (A0..A12) and 8 data pins (D0..D7). The seven remaining pins are used for power (Vss, Vcc), the <a href="Clock_signal" title="Clock signal">CPU timing clock</a> (φ0, φ2), to reset the CPU (the /RES pin), to request a CPU wait state during its next memory read access (the RDY pin), and for the CPU to indicate if a read or write memory (or <a href="Memory-mapped_I/O" class="mw-redirect" title="Memory-mapped I/O">MMIO</a> device) access is being performed (the R/W pin). There is no <a href="Interrupt_request_(PC_architecture)" class="mw-redirect" title="Interrupt request (PC architecture)">IRQ</a> or <a href="Non-maskable_interrupt" title="Non-maskable interrupt">NMI</a> pin on the processor.

</p><p>The RDY pin is not included on all other 28-pin cut-down versions of the 6502. Within the Atari 2600, RDY is used to synchronise the CPU to the television video lines. This function is essential for the 'racing the beam' method used by the 6502 and Atari <a href="Television_Interface_Adaptor" title="Television Interface Adaptor">Television Interface Adaptor</a> chip to generate the television video signal.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> In response to a specific address access, the TIA will assert RDY to halt the CPU until the end of the current video scan line.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup>

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<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://research.swtch.com/6502">"The MOS 6502 and the Best Layout Guy in the World"</a>. swtch.com. 2011-01-03<span class="reference-accessdate">. Retrieved <span class="nowrap">2014-08-09</span></span>.</cite></span>

</li>

<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://monster6502.com">"MOnSter6502"</a>. monster6502.com. 2017<span class="reference-accessdate">. Retrieved <span class="nowrap">2017-05-01</span></span>.</cite></span>

</li>

<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><cite id="CITEREFBagnall" class="citation book cs1">Bagnall, Brian. <i>Commodore</i>. Variant Press. <q>We sold a microprocessor, RAM, ROM, and I/O chip all for twelve bucks, ...</q></cite></span>

</li>

<li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><cite id="CITEREFBagnall" class="citation book cs1">Bagnall, Brian. <i>Commodore</i>. Variant Press. <q>The 6507, which was a subset of [the 6502], could be made at a cheaper price. It was designed to be a really small package.</q></cite></span>

</li>

<li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://archive.computerhistory.org/resources/access/text/2014/08/102739939-05-01-acc.pdf">"Oral History of Charles Ingerham "Chuck" Peddle"</a> <span class="cs1-format">(PDF)</span>. June 12, 2014. p. 58<span class="reference-accessdate">. Retrieved <span class="nowrap">2021-05-30</span></span>. <q>You don't use a 68000 as a logic replacement; you use it as a computer. And that's a different architecture. And we weren't capable of going there, without a major investment, ... It's supposed to have been in every cash register, it's supposed to have been in every intelligent thing on the airplane, it was supposed to be everywhere.</q></cite></span>

</li>

<li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><cite id="CITEREFVisual6502" class="citation web cs1">Visual6502. <a rel="nofollow" class="external text" href="http://blog.visual6502.org/2010/09/6502-vs-6507.html">"Visual6502.org: 6502 vs. 6507"</a>.</cite><span class="cs1-maint citation-comment"><code class="cs1-code">{{cite web}}</code>: CS1 maint: numeric names: authors list (link)</span>

</span>

</li>

<li id="cite_note-EGM62-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-EGM62_7-0">^</a></b></span> <span class="reference-text"><cite class="citation magazine cs1"><a rel="nofollow" class="external text" href="https://archive.org/details/Electronic_Gaming_Monthly_62/page/n17/mode/2up">"When Pac Ruled the Earth"</a>. <i><a href="Electronic_Gaming_Monthly" title="Electronic Gaming Monthly">Electronic Gaming Monthly</a></i>. No. 62. EGM Media, LLC. September 1994. p. 18.</cite></span>

</li>

<li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://archive.org/details/Atari850InterfaceModuleFieldServiceManual/page/n13/mode/2up">"Atari 850 Interface Module Field Service Manual"</a>. <i>Internet Archive</i>. 1981<span class="reference-accessdate">. Retrieved <span class="nowrap">2021-06-03</span></span>. <q>Block Diagram</q></cite></span>

</li>

<li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://archive.org/details/Atari810DiskDriveFieldServiceManualRev1/page/n41/mode/2up">"Atari 810 Disk Drive Field Service Manual"</a>. <i>Internet Archive</i>. 1980<span class="reference-accessdate">. Retrieved <span class="nowrap">2021-06-03</span></span>. <q>Block Diagrams And Schematics</q></cite></span>

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<li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://archive.org/details/ServiceManualForTheAtari1050DiskDrive/page/n11/mode/2up">"Service Manual For The Atari 1050 Disk Drive"</a>. <i>Internet Archive</i>. 1983<span class="reference-accessdate">. Retrieved <span class="nowrap">2021-06-03</span></span>. <q>Electronic Theory</q></cite></span>

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<li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://problemkaputt.de/2k6specs.htm">"Atari 2600 Specifications"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2021-05-31</span></span>. <q>Memory Mirrors</q></cite></span>

</li>

<li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text"><cite id="CITEREFPeter_Turnbull2005" class="citation web cs1">Peter Turnbull (January 25, 2005). <a rel="nofollow" class="external text" href="https://marc.info/?l=classiccmp&m=110668039327589&w=2">"MOS 6507 Tech Spec's"</a>.</cite></span>

</li>

<li id="cite_note-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-13">^</a></b></span> <span class="reference-text"><cite id="CITEREFMiner1976" class="citation web cs1">Miner, Jay (October 22, 1976). <a rel="nofollow" class="external text" href="http://www.howell1964.freeserve.co.uk/Atari/tia/description.htm">"TIA 1A – Television Interface Adaptor (Model 1A)"</a>. <i>Internet Archive</i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20080424113533/http://www.howell1964.freeserve.co.uk/Atari/tia/description.htm">Archived</a> from the original on 2008-04-24<span class="reference-accessdate">. Retrieved <span class="nowrap">2021-06-04</span></span>. <q>This circuit operates on a "line by line" basis, always outputing the same information every television line unless new data is written into it by the microprocessor.</q></cite></span>

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<li id="cite_note-14"><span class="mw-cite-backlink"><b><a href="#cite_ref-14">^</a></b></span> <span class="reference-text"><cite id="CITEREFWrightMay1988" class="citation web cs1">Wright, Steve; May, Darryl (1988). <a rel="nofollow" class="external text" href="https://archive.org/details/StellaProgrammersGuide/page/n5/mode/2up">"2600 (STELLA) Programmer's Guide"</a>. <i>Internet Archive</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2021-06-01</span></span>. <q>Simply writting [<i>sic</i>] to WSYNC causes the microprocessor to halt until the electron beam reaches the right edge of the screen, ...</q></cite></span>

</li>

</ol></div></div>

<div class="mw-heading mw-heading2"><h2 id="Further_reading">Further reading</h2></div>

<ul><li><a rel="nofollow" class="external text" href="http://www.classiccmp.org/cini/pdf/Commodore/ds_c650x.pdf">Commodore Semiconductor Group: <i>6500 Microprocessors</i></a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20201001060315/http://www.classiccmp.org/cini/pdf/Commodore/ds_c650x.pdf">Archived</a> 2020-10-01 at the <a href="Wayback_Machine" title="Wayback Machine">Wayback Machine</a>, November 1985, p. 11.</li></ul>

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</style><div role="note" class="hatnote navigation-not-searchable">See also: <a href="MOS_Technology_6502#Further_reading" title="MOS Technology 6502">List of books about 65xx microprocessor families</a></div>

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</style><div id="65xx-based_CPUs163" style="font-size:114%;margin:0 4em">65xx-based CPUs</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="MOS_Technology" title="MOS Technology">MOS Technology</a>, CSG</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Western_Design_Center" title="Western Design Center">Western Design Center</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Mitsubishi" title="Mitsubishi">Mitsubishi</a>, <a href="Renesas_Electronics" title="Renesas Electronics">Renesas</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Mitsubishi_740" title="Mitsubishi 740">740 family</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Architecture</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Interrupts_in_65xx_processors" title="Interrupts in 65xx processors">Interrupts in 65xx processors</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">For <a href="Video_game" title="Video game">game</a> machines</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Hudson_Soft_HuC6280" title="Hudson Soft HuC6280">Hudson HuC6280</a></li>

<li><a href="List_of_Super_NES_enhancement_chips#SA1" title="List of Super NES enhancement chips">Nintendo SA-1</a></li>

<li><a href="Ricoh_2A03" title="Ricoh 2A03">Ricoh 2A03</a></li>

<li><a href="Ricoh_5A22" title="Ricoh 5A22">Ricoh 5A22</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Designers</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Bill_Mensch" title="Bill Mensch">Bill Mensch</a></li>

<li><a href="Chuck_Peddle" title="Chuck Peddle">Chuck Peddle</a></li></ul>

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