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1.1     ! root        1: .\"$Header: ibm6155.4,v 10.1 86/11/19 10:55:52 jg Exp $
        !             2: .\"$Source: /u1/X/libibm/doc/man/RCS/ibm6155.4,v $
        !             3: .\ This file uses -man macros.
        !             4: .TH IBM6155 4 "31 Mar 1986" "Space overwritten by .AC macro" " "
        !             5: .UC 4
        !             6: .AC 1 0
        !             7: .SH NAME
        !             8: ibm6155, apa16 \- IBM 6155 Extended Monochrome Graphics Display interface
        !             9: .SH SYNOPSIS
        !            10: .B "pseudo-device apa16"
        !            11: .SH DESCRIPTION
        !            12: The IBM 6155 Extended Monochrome Graphics Display 
        !            13: is a 15-inch CRT with gray-white phosphor, driven at 60 Hz non-interlaced.
        !            14: It provides
        !            15: a monochrome, all-points-addressable, bit-mapped display with 786,432
        !            16: points on the screen (1024 pixels on each of 768 displayable lines).
        !            17: All pixels are directly accessible by the workstation's CPU. 
        !            18: A fast raster-operation processor is provided with built-in
        !            19: capability for bit-block transfer, line draw, image copy/merge and image
        !            20: rotate. A graphics queue mechanism with synchronization and controlled 
        !            21: branching allows pre-programmed graphics subroutines. A 48x64-bit hardware
        !            22: cursor provides instant cursor operations without disruption of display data. 
        !            23: .PP
        !            24: The display adapter is a single PC/AT card installed in the
        !            25: I/O bus as a sixteen-bit device. The display appears to the system
        !            26: as two separate memory areas: a 128-kilobyte block of 
        !            27: system memory, and 20 bytes of I/O space (addressed from 0xd10 through
        !            28: 0xd2f, and 0x6f3).  The 128KB block defines
        !            29: both the visible frame buffer (addressed from 0xf4d80000 through 
        !            30: 0xf4d97ffe) and the hidden, off-screen memory area (addressed from
        !            31: 0xf4d98000 through 0xf4d9fffe). The 20 bytes of I/O space access the
        !            32: display adapter's control registers.
        !            33: .PP
        !            34: The display operates in glass tty (the default) mode and window-manager mode:
        !            35: .IP -
        !            36: Glass tty mode initialization consists of 
        !            37: the downloading of a character font and certain graphics subroutines
        !            38: into the adapter card, followed by a cursor home and screen clear.
        !            39: In this mode, the display driver emulates a smart terminal,
        !            40: similar to an IBM 3101, and can be
        !            41: .IR /dev/console .
        !            42: .IP -
        !            43: In window-manager mode, a user-level process, 
        !            44: such as a window manager, can directly control the display device hardware,
        !            45: loading control programs, accessing display buffers, etc. 
        !            46: When a process opens 
        !            47: .IR /dev/apa16 , 
        !            48: the kernel switches
        !            49: console output to another display device, if available, or buffers the
        !            50: output until later (see 
        !            51: .IR cons (4)). 
        !            52: At this point, the display and 
        !            53: control memory areas are accessible for manipulation by the user program.
        !            54: Glass tty mode is reentered when 
        !            55: .I /dev/apa16 
        !            56: is closed.
        !            57: .SH FILES
        !            58: /dev/apa16
        !            59: .br
        !            60: /dev/console
        !            61: .SH "SEE ALSO"
        !            62: cons(4), ibm5151(4), ibm6153(4), ibmaed(4), keyboard(4), tty(4)
        !            63: .SH DIAGNOSTICS
        !            64: None.
        !            65: .SH ERRORS
        !            66: The following errors can be returned by the interface:
        !            67: .TP 12
        !            68: [ENODEV]
        !            69: Nonexistent display (on open, close, read, write, or ioctl);
        !            70: .br
        !            71: Unavailable display (on open):  user processes are denied access to
        !            72: this display (see
        !            73: .IR consoles (5),
        !            74: .IR setscreen (8)).
        !            75: .TP
        !            76: [EIO]
        !            77: Made an attempt to close a display device that was not open.
        !            78: .TP 11
        !            79: [EBUSY]
        !            80: The display has already been opened by a user process.
        !            81: .SH BUGS
        !            82: Access to the PC/AT I/O and memory busses through
        !            83: .I /dev/apa16
        !            84: is not limited to the apa-16 addresses.
        !            85: 

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