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vpo(4) [v7 man page]

VPO(4)							   BSD Kernel Interfaces Manual 						    VPO(4)

vpo -- parallel to SCSI interface driver SYNOPSIS
device vpo For one or more SCSI busses: device scbus DESCRIPTION
The vpo driver provide access to parallel port Iomega Zip and Jaz drives. HARDWARE
The vpo driver supports the following parallel to SCSI interfaces: o Adaptec AIC-7110 Parallel to SCSI interface (built-in to Iomega ZIP drives) o Iomega Jaz Traveller interface o Iomega MatchMaker SCSI interface (built-in to Iomega ZIP+ drives) USAGE
The driver should let you use a printer connected to the drive while transferring data. DOS and FreeBSD file systems are supported. When mounting a DOS file system or formating a FreeBSD file system, check the slice of the disk with the fdisk(8) utility. In order to unixify a ZIP disk, put the following in /etc/disktab: zip|zip 100: :ty=removable:se#512:nc#96:nt#64:ns#32: :pa#196608:oa#0:ba#4096:fa#512: :pb#196608:ob#0:bb#4096:fb#512: :pc#196608:oc#0:bc#4096:fc#512: and use bsdlabel(8). If you have trouble with your driver, your parallel chipset may not run properly at the detected mode (NIBBLE, PS2 or EPP). Tune the ppc(4) bootflags to force other modes. SEE ALSO
da(4), lpt(4), ppbus(4), ppc(4), scsi(4) HISTORY
The vpo manual page first appeared in FreeBSD 3.0. AUTHORS
This manual page was written by Nicolas Souchu. BUGS
During boot, the driver first tries to detect a classic ZIP, then a ZIP+. The ZIP+ detection is intrusive and may send erroneous characters to your printer if the drive is not connected to your parallel port. BSD
December 14, 2004 BSD

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PPC(4)							   BSD Kernel Interfaces Manual 						    PPC(4)

ppc -- Parallel Port Chipset driver SYNOPSIS
device ppc In /boot/device.hints:"isa" hint.ppc.0.irq="7" For one or more PPBUS busses: device ppbus DESCRIPTION
The ppc driver provides low level support to various parallel port chipsets for the ppbus(4) system. During the probe phase, ppc detects parallel port chipsets and initializes private data according to their operating mode: COMPATIBLE, NIB- BLE, PS/2, EPP, ECP and other mixed modes. If a mode is provided at startup through the flags variable of the boot interface, the operating mode of the chipset is forced according to flags and the hardware supported modes. During the attach phase, ppc allocates a ppbus structure, initializes it and calls the ppbus attach function. Supported flags bits 0-3: chipset forced mode(s) PPB_COMPATIBLE 0x0 /* Centronics compatible mode */ PPB_NIBBLE 0x1 /* reverse 4 bit mode */ PPB_PS2 0x2 /* PS/2 byte mode */ PPB_EPP 0x4 /* EPP mode, 32 bit */ PPB_ECP 0x8 /* ECP mode */ And any mixed values. bit 4: EPP protocol (0 EPP 1.9, 1 EPP 1.7) bit 5: activate IRQ (1 IRQ disabled, 0 IRQ enabled) bit 6: disable chipset specific detection bit 7: disable FIFO detection Supported chipsets Some parallel port chipsets are explicitly supported: detection and initialisation code has been written according to their datasheets. o SMC FDC37C665GT and FDC37C666GT chipsets o Natsemi PC873xx-family (PC87332 and PC87306) o Winbond W83877xx-family (W83877F and W83877AF) o SMC-like chipsets with mixed modes (see ppbus(4)) Adding support to a new chipset You may want to add support for the newest chipset your motherboard was sold with. For the ISA bus, just retrieve the specs of the chipset and write the corresponding ppc_mychipset_detect() function. Then add an entry to the general purpose ppc_detect() function. Your ppc_mychipset_detect() function should ensure that if the mode field of the flags boot variable is not null, then the operating mode is forced to the given mode and no other mode is available and ppb->ppb_avm field contains the available modes of the chipset. SEE ALSO
ppbus(4), ppi(4), device.hints(5) HISTORY
The ppc manual page first appeared in FreeBSD 3.0. AUTHORS
This manual page was written by Nicolas Souchu. BUGS
The chipset detection process may corrupt your chipset configuration. You may disable chipset specific detection by using the above flags. BSD
March 5, 1998 BSD
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