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-<table class="head">
-  <tr>
-    <td class="head-ltitle">AHC(4)</td>
-    <td class="head-vol">Device Drivers Manual</td>
-    <td class="head-rtitle">AHC(4)</td>
-  </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">ahc</code> &#x2014; <span class="Nd">Adaptec
-    VL/ISA/PCI SCSI host adapter driver</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp">To compile this driver into the kernel, place the following lines
-    in your kernel configuration file:</p>
-<div class="Bd Pp Bd-indent"><code class="Cd">device scbus</code>
-<br/>
-<code class="Cd">device ahc</code>
-<p class="Pp">For one or more PCI cards:
-  <br/>
-  <code class="Cd">device pci</code></p>
-</div>
-<p class="Pp">Alternatively, to load the driver as a module at boot time, place
-    the following lines in <a class="Xr">loader.conf(5)</a>:</p>
-<div class="Bd Pp Bd-indent Li">
-<pre>ahc_load=&quot;YES&quot;
-ahc_isa_load=&quot;YES&quot;
-ahc_pci_load=&quot;YES&quot;</pre>
-</div>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">This driver provides access to the SCSI bus(es) connected to the
-    Adaptec AIC77xx and AIC78xx host adapter chips.</p>
-<p class="Pp">Driver features include support for twin and wide busses, fast,
-    ultra or ultra2 synchronous transfers depending on controller type, tagged
-    queueing, SCB paging, and target mode.</p>
-<p class="Pp">Per target configuration performed in the SCSI-Select menu,
-    accessible at boot is honored by this driver. This includes
-    synchronous/asynchronous transfers, maximum synchronous negotiation rate,
-    wide transfers, disconnection, the host adapter's SCSI ID. For systems that
-    store non-volatile settings in a system specific manner rather than a serial
-    eeprom directly connected to the aic7xxx controller, the BIOS must be
-    enabled for the driver to access this information. This restriction applies
-    to many chip-down motherboard configurations.</p>
-<p class="Pp">Performance and feature sets vary throughout the aic7xxx product
-    line. The following table provides a comparison of the different chips
-    supported by the <code class="Nm">ahc</code> driver. Note that wide and twin
-    channel features, although always supported by a particular chip, may be
-    disabled in a particular motherboard or card design.</p>
-<div class="Bd Pp Bd-indent">
-<table class="Bl-column">
-  <tr id="Chip">
-    <td><a class="permalink" href="#Chip"><i class="Em">Chip</i></a></td>
-    <td>MIPS</td>
-    <td>Bus</td>
-    <td>MaxSync</td>
-    <td>MaxWidth</td>
-    <td>SCBs</td>
-    <td>Features</td>
-  </tr>
-  <tr>
-    <td>aic7770</td>
-    <td>10</td>
-    <td>VL</td>
-    <td>10MHz</td>
-    <td>16Bit</td>
-    <td>4</td>
-    <td>1</td>
-  </tr>
-  <tr>
-    <td>aic7850</td>
-    <td>10</td>
-    <td>PCI/32</td>
-    <td>10MHz</td>
-    <td>8Bit</td>
-    <td>3</td>
-    <td></td>
-  </tr>
-  <tr>
-    <td>aic7860</td>
-    <td>10</td>
-    <td>PCI/32</td>
-    <td>20MHz</td>
-    <td>8Bit</td>
-    <td>3</td>
-    <td></td>
-  </tr>
-  <tr>
-    <td>aic7870</td>
-    <td>10</td>
-    <td>PCI/32</td>
-    <td>10MHz</td>
-    <td>16Bit</td>
-    <td>16</td>
-    <td></td>
-  </tr>
-  <tr>
-    <td>aic7880</td>
-    <td>10</td>
-    <td>PCI/32</td>
-    <td>20MHz</td>
-    <td>16Bit</td>
-    <td>16</td>
-    <td></td>
-  </tr>
-  <tr>
-    <td>aic7890</td>
-    <td>20</td>
-    <td>PCI/32</td>
-    <td>40MHz</td>
-    <td>16Bit</td>
-    <td>16</td>
-    <td>3 4 5 6 7 8</td>
-  </tr>
-  <tr>
-    <td>aic7891</td>
-    <td>20</td>
-    <td>PCI/64</td>
-    <td>40MHz</td>
-    <td>16Bit</td>
-    <td>16</td>
-    <td>3 4 5 6 7 8</td>
-  </tr>
-  <tr>
-    <td>aic7892</td>
-    <td>20</td>
-    <td>PCI/64</td>
-    <td>80MHz</td>
-    <td>16Bit</td>
-    <td>16</td>
-    <td>3 4 5 6 7 8</td>
-  </tr>
-  <tr>
-    <td>aic7895</td>
-    <td>15</td>
-    <td>PCI/32</td>
-    <td>20MHz</td>
-    <td>16Bit</td>
-    <td>16</td>
-    <td>2 3 4 5</td>
-  </tr>
-  <tr>
-    <td>aic7895C</td>
-    <td>15</td>
-    <td>PCI/32</td>
-    <td>20MHz</td>
-    <td>16Bit</td>
-    <td>16</td>
-    <td>2 3 4 5 8</td>
-  </tr>
-  <tr>
-    <td>aic7896</td>
-    <td>20</td>
-    <td>PCI/32</td>
-    <td>40MHz</td>
-    <td>16Bit</td>
-    <td>16</td>
-    <td>2 3 4 5 6 7 8</td>
-  </tr>
-  <tr>
-    <td>aic7897</td>
-    <td>20</td>
-    <td>PCI/64</td>
-    <td>40MHz</td>
-    <td>16Bit</td>
-    <td>16</td>
-    <td>2 3 4 5 6 7 8</td>
-  </tr>
-  <tr>
-    <td>aic7899</td>
-    <td>20</td>
-    <td>PCI/64</td>
-    <td>80MHz</td>
-    <td>16Bit</td>
-    <td>16</td>
-    <td>2 3 4 5 6 7 8</td>
-  </tr>
-</table>
-<p class="Pp"></p>
-<ol class="Bl-enum Bl-compact">
-  <li>Multiplexed Twin Channel Device - One controller servicing two
-    busses.</li>
-  <li>Multi-function Twin Channel Device - Two controllers on one chip.</li>
-  <li>Command Channel Secondary DMA Engine - Allows scatter gather list and SCB
-      prefetch.</li>
-  <li>64 Byte SCB Support - SCSI CDB is embedded in the SCB to eliminate an
-      extra DMA.</li>
-  <li>Block Move Instruction Support - Doubles the speed of certain sequencer
-      operations.</li>
-  <li>&#x2018;Bayonet&#x2019; style Scatter Gather Engine - Improves S/G
-      prefetch performance.</li>
-  <li>Queuing Registers - Allows queueing of new transactions without pausing
-      the sequencer.</li>
-  <li>Multiple Target IDs - Allows the controller to respond to selection as a
-      target on multiple SCSI IDs.</li>
-</ol>
-</div>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="CONFIGURATION_OPTIONS"><a class="permalink" href="#CONFIGURATION_OPTIONS">CONFIGURATION
-  OPTIONS</a></h1>
-<p class="Pp">To allow PCI adapters to use memory mapped I/O if enabled:</p>
-<p class="Pp"><code class="Cd">options AHC_ALLOW_MEMIO=(0 -- disabled, 1 --
-    enabled)</code></p>
-<div class="Bd Pp Bd-indent">Memory mapped I/O is more efficient than the
-  alternative, programmed I/O. Most PCI BIOSes will map devices so that either
-  technique for communicating with the card is available. In some cases, usually
-  when the PCI device is sitting behind a PCI-&gt;PCI bridge, the BIOS may fail
-  to properly initialize the chip for memory mapped I/O. The typical symptom of
-  this problem is a system hang if memory mapped I/O is attempted.
-<p class="Pp">Most modern motherboards perform the initialization correctly and
-    work fine with this option enabled and it is the default. This option can
-    also be dynamically configured through a device hint documented below.</p>
-</div>
-<p class="Pp">To statically configure one or more controllers to assume the
-    target role:</p>
-<p class="Pp"><code class="Cd">options AHC_TMODE_ENABLE=&lt;bitmask of
-    units&gt;</code></p>
-<div class="Bd Pp Bd-indent">The value assigned to this option should be a
-  bitmap of all units where target mode is desired. For example, a value of
-  0x25, would enable target mode on units 0, 2, and 5. A value of 0x8a enables
-  it for units 1, 3, and 7.
-<p class="Pp">Note that controllers can be dynamically configured through a
-    device hint documented below.</p>
-</div>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BOOT_OPTIONS"><a class="permalink" href="#BOOT_OPTIONS">BOOT
-  OPTIONS</a></h1>
-<p class="Pp">The following options are switchable by setting values in
-    <span class="Pa">/boot/device.hints</span>.</p>
-<p class="Pp">They are:</p>
-<dl class="Bl-tag">
-  <dt id="hint.ahc."><var class="Va">hint.ahc.</var><var class="Ar">N</var><var class="Va">.tmode_enable</var></dt>
-  <dd>A hint to define whether the SCSI target mode is enabled, defaults to
-      disabled (0 -- disabled, 1 -- enabled).</dd>
-  <dt id="hint.ahc.~2"><var class="Va">hint.ahc.</var><var class="Ar">N</var><var class="Va">.allow_memio</var></dt>
-  <dd>A hint to define whether memory mapped io is enabled or disabled for this
-      adapter, defaults to enabled (0 -- disabled, 1 -- enabled).</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HARDWARE"><a class="permalink" href="#HARDWARE">HARDWARE</a></h1>
-<p class="Pp">The <code class="Nm">ahc</code> driver supports the following
-    VL/ISA/PCI parallel SCSI controllers and cards:</p>
-<p class="Pp"></p>
-<ul class="Bl-bullet Bl-compact">
-  <li>Adaptec AIC7770 host adapter chip</li>
-  <li>Adaptec AIC7850 host adapter chip</li>
-  <li>Adaptec AIC7860 host adapter chip</li>
-  <li>Adaptec AIC7870 host adapter chip</li>
-  <li>Adaptec AIC7880 host adapter chip</li>
-  <li>Adaptec AIC7890 host adapter chip</li>
-  <li>Adaptec AIC7891 host adapter chip</li>
-  <li>Adaptec AIC7892 host adapter chip</li>
-  <li>Adaptec AIC7895 host adapter chip</li>
-  <li>Adaptec AIC7896 host adapter chip</li>
-  <li>Adaptec AIC7897 host adapter chip</li>
-  <li>Adaptec AIC7899 host adapter chip</li>
-  <li>Adaptec 274X(W)</li>
-  <li>Adaptec 274X(T)</li>
-  <li>Adaptec 2910</li>
-  <li>Adaptec 2915</li>
-  <li>Adaptec 2920C</li>
-  <li>Adaptec 2930C</li>
-  <li>Adaptec 2930U2</li>
-  <li>Adaptec 2940</li>
-  <li>Adaptec 2940J</li>
-  <li>Adaptec 2940N</li>
-  <li>Adaptec 2940U</li>
-  <li>Adaptec 2940AU</li>
-  <li>Adaptec 2940UW</li>
-  <li>Adaptec 2940UW Dual</li>
-  <li>Adaptec 2940UW Pro</li>
-  <li>Adaptec 2940U2W</li>
-  <li>Adaptec 2940U2B</li>
-  <li>Adaptec 2950U2W</li>
-  <li>Adaptec 2950U2B</li>
-  <li>Adaptec 19160B</li>
-  <li>Adaptec 29160B</li>
-  <li>Adaptec 29160N</li>
-  <li>Adaptec 3940</li>
-  <li>Adaptec 3940U</li>
-  <li>Adaptec 3940AU</li>
-  <li>Adaptec 3940UW</li>
-  <li>Adaptec 3940AUW</li>
-  <li>Adaptec 3940U2W</li>
-  <li>Adaptec 3950U2</li>
-  <li>Adaptec 3960</li>
-  <li>Adaptec 39160</li>
-  <li>Adaptec 3985</li>
-  <li>Adaptec 4944UW</li>
-  <li>Many motherboards with on-board SCSI support</li>
-</ul>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SCSI_CONTROL_BLOCKS_(SCBs)"><a class="permalink" href="#SCSI_CONTROL_BLOCKS_(SCBs)">SCSI
-  CONTROL BLOCKS (SCBs)</a></h1>
-<p class="Pp">Every transaction sent to a device on the SCSI bus is assigned a
-    &#x2018;SCSI Control Block&#x2019; (SCB). The SCB contains all of the
-    information required by the controller to process a transaction. The chip
-    feature table lists the number of SCBs that can be stored in on-chip memory.
-    All chips with model numbers greater than or equal to 7870 allow for the on
-    chip SCB space to be augmented with external SRAM up to a maximum of 255
-    SCBs. Very few Adaptec controller configurations have external SRAM.</p>
-<p class="Pp" id="SCB">If external SRAM is not available, SCBs are a limited
-    resource. Using the SCBs in a straight forward manner would only allow the
-    driver to handle as many concurrent transactions as there are physical SCBs.
-    To fully utilize the SCSI bus and the devices on it, requires much more
-    concurrency. The solution to this problem is
-    <a class="permalink" href="#SCB"><i class="Em">SCB Paging</i></a>, a concept
-    similar to memory paging. SCB paging takes advantage of the fact that
-    devices usually disconnect from the SCSI bus for long periods of time
-    without talking to the controller. The SCBs for disconnected transactions
-    are only of use to the controller when the transfer is resumed. When the
-    host queues another transaction for the controller to execute, the
-    controller firmware will use a free SCB if one is available. Otherwise, the
-    state of the most recently disconnected (and therefore most likely to stay
-    disconnected) SCB is saved, via dma, to host memory, and the local SCB
-    reused to start the new transaction. This allows the controller to queue up
-    to 255 transactions regardless of the amount of SCB space. Since the local
-    SCB space serves as a cache for disconnected transactions, the more SCB
-    space available, the less host bus traffic consumed saving and restoring SCB
-    data.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
-  ALSO</a></h1>
-<p class="Pp"><a class="Xr">ahd(4)</a>, <a class="Xr">cd(4)</a>,
-    <a class="Xr">da(4)</a>, <a class="Xr">sa(4)</a>,
-  <a class="Xr">scsi(4)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">ahc</code> driver appeared in
-    <span class="Ux">FreeBSD 2.0</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">The <code class="Nm">ahc</code> driver, the AIC7xxx sequencer-code
-    assembler, and the firmware running on the aic7xxx chips was written by
-    <span class="An">Justin T. Gibbs</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp">Some Quantum drives (at least the Empire 2100 and 1080s) will not
-    run on an AIC7870 Rev B in synchronous mode at 10MHz. Controllers with this
-    problem have a 42 MHz clock crystal on them and run slightly above 10MHz.
-    This confuses the drive and hangs the bus. Setting a maximum synchronous
-    negotiation rate of 8MHz in the SCSI-Select utility will allow normal
-    operation.</p>
-<p class="Pp">Although the Ultra2 and Ultra160 products have sufficient
-    instruction ram space to support both the initiator and target roles
-    concurrently, this configuration is disabled in favor of allowing the target
-    role to respond on multiple target ids. A method for configuring dual role
-    mode should be provided.</p>
-<p class="Pp">Tagged Queuing is not supported in target mode.</p>
-<p class="Pp">Reselection in target mode fails to function correctly on all high
-    voltage differential boards as shipped by Adaptec. Information on how to
-    modify HVD board to work correctly in target mode is available from
-  Adaptec.</p>
-</section>
-</div>
-<table class="foot">
-  <tr>
-    <td class="foot-date">September 29, 2025</td>
-    <td class="foot-os">FreeBSD 15.0</td>
-  </tr>
-</table>