# STB-400 EEPROM Contents Specification

CONFIDENTIAL

Document ref: | 2501,822/FS
Project: | STB-400
Issue: | 6A
Date: | 16/07/2002
Change: |
Author(s): | Owen Love Stephen Revill Alistair Rodger Ben Avison
Classification: | Pace Restricted
Master Format: | HTML

## Contents

1.0 | Copyright
2.0 | Overview
3.0 | Outstanding issues
4.0 | Technical background
5.0 | User interface
6.0 | Programmer interface
7.0 | Data interchange
8.0 | Data formats
9.0 | External dependencies
10.0 | Acceptance test
11.0 | Non compliances
12.0 | Development test strategy
13.0 | Product organisation
14.0 | Future enhancements
15.0 | Glossary
16.0 | References
17.0 | History

## 1.0 Copyright

This document is copyright © Pace Micro Technology plc, 1999.

## 2.0 Overview

This document specifies the contents the 4096 bytes of NV-RAM in the STB-400 and the default values stored. See the STB-400 OS ROM Functional Specification [1] for more detailed information on the STB-400 functionality.

## 3.0 Outstanding issues

There are no outstanding issues.

## 4.0 Technical background

### NV-RAM Area:

See also PRM's 5a pg. 73. [3] locations denoted as 'not used' in this specification may be specified allocated in the PRM.

The NV-RAM in the STB-400 is used to stored the default configuration settings for many parts of the OS. Most of these settings are automatically initialised to suitable values every time the STB-400 boots. This avoids any potential problems due to corruption of the EEPROM contents. The contents of the EEPROM are also reset whenever one of the following conditions holds true:

- There has been a corruption. (i.e. the checksum is inconsistent with the contents).
- The Delete key on a PS/2 keyboard is held pressed for >5s when power is applied to the unit.
- Any of the following locations are non zero.
  - Screen size (location &8f).
  - RAM disc size (location &90).
  - System heap size (location &91).
  - RMA size (location &92).
  - Sprite Size (location &93).
- If the specified year is outside the range 1995-2020.
- If the 'No Boot' bit is clear (location &10 bit 4).

The last 1K of NV-RAM (from locations &C00 to &FFF inclusive) is the write-protected area.

The contents of NV-RAM can be read and written using the NV-RAM module [2]. The following table provides details of the contents of NV-RAM and the default values. Some areas are used for network configuration, the contents of which may vary depending on the networking protocol used. These are denoted as 'network configuration options'.

Notation: | Meaning:
--- | ---
a,b | Numbers a and b
a-b | Numbers a to b (inclusive)
XX | Do not care, contents liable to change
(D) | Default location sub-bit option
(D=xx) | Default value for specified location

Loc: | Value: | Description:
00 | 00 | Network IP Address (octet 0)
01 | 00 | Network configuration option (one byte)
02 | 00 | Boot file server name CVS (first byte only)
03,04 | 00 | Not used
05 | 2E | Filesystem number (ResourceFS)
06,07 | 00 | UNPLUG bytes 1 and 2
08 | 00 | Not used
09 | 00 | UNPLUG byte 3
0A | 00 | TV vertical adjust
    Bit  0-3  Not used
    Bit    4  TV interlace (D=1)
    Bits 5-7  TV vertical adjust (D=0)
0B | 10 | Miscellaneous configuration
    Bits 0-2  Not used
    Bits 3-5  Caps mode
              001 = Shift caps
              010 = No caps (D)
              100 = Caps
    Bit  6-7  Not used
0C | 20 | Keyboard auto-repeat delay
0D | 08 | Keyboard auto-repeat rate
0E | 00 | Not used
0F | 02 | Printer information
    Bit    0  Printer colour status
              0 = monochrome (D)
              1 = colour
    Bit    1  Status of ignore character
              0 = Use the ignore character
              1 = No ignore character (D)
    Bits 2-7  Not used
10 | 10 | Miscellaneous flags
    Bit  0-3  Not used
    Bit    4  Boot/NoBoot
              0 = No Boot
              1 = Boot (D)
    Bits 5-7  Not used
11 | 00 | Not used
12-13 | 00 | UNPLUG bytes 4 and 5
14-15 | 00 | Extension ROM unplug bytes 1 & 2
16 | 00 | Wimp flags
    Bit 0    Wimp double-click delay unit
    Bit 1    Wimp auto-front delay unit
    Bit 2-6  Wimp double-click move
    Bit 7    Wimp auto-front Iconbar
17 | 00 | Wimp flags
    Bits 0-3  Wimp auto-menu delay
    Bit  4    Wimp auto-menu delay unit
    Bits 5-7  Wimp Iconbar speed
18 | 00 | Territory (UK)
19 | 00 | Printer buffer size: 0 =1k in usual area >0 = 4K * n (claimed from RMA)
1A | 00 | Not used
1B | 00 | Wimp flags
    Bits 0-3  Wimp menu drag delay
    Bit  4    Wimp menu drag delay unit
    Bits 5-7  Wimp Iconbar acceleration
1C | 01 | FileSwitch CMOS
    Bit    0  Truncate name bit
              0 = Give error if name too big
              1 = Truncate name (D)
1D | 03 | Mouse type CMOS
    0 = standard quadrature mouse
    1 = Microsoft compatible serial mouse
    2 = Mouse Systems Corporation serial mouse
    3 = PS/2 mouse (D)
    4-255 = Reserved
1E-21 | 00 | Extra IP Address 4 (used by IPConfig)
22-25 | 00 | Extra IP Address 3 (used by IPConfig)
26-29 | 00 | Extra IP Address 2 (used by IPConfig)
2A-2D | 00 | Extra IP Address 1 (used by IPConfig)
2E-37 | 00 | Not used
38-3B | 00 | Boot Server IP Address
3C-4F | 00 | Not used
50 | 00 | IP Address of NetBios Name Server (octet 0)
51-6A | 00 | NFS Mount path to boot structure
6B | 00 | Not used
6C-6E | 00 | Network IP Address (octet 3, 2 and 1)
6F | 01 | Additional Networking allocations
    Bit 0     LanManFS Transport Protocol Switch Flag
              0 = NetBEUI
              1 = NetBIOS over IP (D)
    Bit 1     Enable Static IP Booting
              0 = Dynamic IP Booting (D)
              1 = Static IP Booting
    Bit 2     Not used
    Bits 3-7  Sub-net Mask
70-7F | 00 | Not used
80 | 00 | Current year (D=00) Must be set during manufacture
81 | 14 | Current year (century) (D=14) Must be set during manufacture
82-83 | 00 | UNPLUG bytes 6 and 7
84 | A0 | DumpFormat & 16-bit sound
    Bits 0-4  No used
    Bits 5,6  16-Bit sound control
              0 = No 16-bit sound output, use mu-law
              1 = DAC clock is slave. 11.2896MHz
                      external clock (D)
              2 = DAC clock is slave. No external
              3 = DAC clock is master. External clock
                      must be used for 16-bit sound.
    Bit    7  Sound quality control
              0 = No quality adjustment
              1 = Perform sample interpolation (D)
85 | FD | Sync, monitor and mode information
    Bits 0,7  Sync type
              00 = Separate syncs
              01 = Composite syncs
              10 = Reserved
              11 = Auto syncs (D)
    Bit    1  Not used - set to zero
    Bits 2-6  Monitor type
              00000 = Monitor type 0 Normal
              00001 = Monitor type 1 Multisync
              00010 = Monitor type 2 Hi-Res Monochrome
              00011 = Monitor type 3 VGA
              00100 = Monitor type 4 Super VGA
              00101 = Monitor type 5 LCD
              00110 = Monitor type 6 Third party use
              00111 = Monitor type 7 File
              01000 = Monitor type 8
              to
              11110 = Monitor type 1E - Undefined
              11111 = Monitor type 1F Auto (D)
86 | 20 | FontSize (units of 4k) (D=32 - 128k)
87-8A | 00 | Not Used
8B | F4 | Time CMOS (GMT) Indicates the offset from UTC(GMT) to the current time zone. The byte is a signed 2's complement number, this represents the number of 15 minute increments required.
8C | 21 | Desktop features CMOS
    Bit    0  Chosen RISC OS look
              0 = 2D (RISC OS 2.00 style) look
              1 = 3D look (D)
    Bits 1-4  Desktop font setting:
              0 = Use Wimp$Font and Wimp$FontSize
              1 = Use system font
              2-15 = use ROM font
    Bit    5  Wimp sprite precedence
    Bit    6  Wimp button type
    Bit    7  Window background tiling enabled
              0 = tiled with tile_1 (D)
              1 = not tiled, ie grey1
8D,8E | 00 | UNPLUG bytes 8 and 9
8F | 00 | Screen size (units of page size)
90 | 00 | RAM Disc size (units of page size)
91 | 00 | System heap size (units of page size)
92 | 00 | RMA size (units of pagesize)
93 | 00 | Sprite size (units of pagesize)
94 | F0 | Sound default parameters
    Bits 0-3  Channel voice 1-16 (D=0 - Voice 1)
    Bits 4-6  Loudness (D=7 - Volume 7)
    Bit    7  Speaker on/off (Not used)
95-98 | 00 | DNS IP address
99-9D | 00 | Not used
9E-AC | 00 | Boot FileServer name (all except first byte)
AD-B0 | 00 | UNPLUG bytes 9 to 12
B1-B8 | 00 | Expn. card unplugged ROM bytes 1 to 8
B9 | 0A | Configured language
BA | 01 | Configured country (UK)
BB | 00 | Network card UNPLUG byte
BC | 00 | Miscellaneous flags #1
    Bits 0-2  Not used
    Bits 3-5  Screen blank time
              000 = No screen blanking (D)
              001 = 30 Second blanking time
              010 = 1 minute blanking time
              011 = 2 minutes blanking time
              100 = 5 minutes blanking time
              101 = 10 minutes blanking time
              110 = 15 minutes blanking time
              111 = 30 minutes blanking time
    Bit    6  Should screen blank ignore WRCH?
              0 = Ignore WRCH (D)
              1 = WRCH un-blanks display.
    Bit    7  Not used
BD-C1 | 00 | Not used
C2 | 02 | Mouse multiplier
C3 | 14 | Miscellaneous
    Bit  0,1 Not used
    Bit    2  Reset CMOS Bit, set to zero by the kernel on startup
              0 = Last reset was not a
                      Delete/Copy/R/T reset
              1 = Last reset was a
                      Delete/Copy/R /T reset (D)
    Bit    3  Not used
    Bit    4  Mode/WimpMode auto bit
              0 = Use WimpModeCMOS
              1 = Auto (D)
    Bit    5  Processor cache
              0 = Cache enabled (D)
              1 = Cache disabled
    Bit   6,7 Not used
C4 | 00 | Wimp mode
C5 | EF | Wimp flags
    Bits 0-3  Instant dragging (1=allow, 0=disallow)
              Bit 0 position (D=1)
              Bit 1 size (D=1)
              Bit 2 horizontal scroll (D=1)
              Bit 3 vertical scroll (D=1)
    Bit    4  Action on error
              0 = beep (D)
              1 = don't beep
    Bits 5,6  Allow windows off screen (1=allow,
                      0=don't allow)
              Bit 5 to bottom and right (D=1)
              Bit 6 to top and left (D=1)
    Bit    7  Auto open sub-menus
              0 = don't auto open
              1 = do open (D)
C6,C7 | 00 | Not used.
C8 | 00 | Max font cache size (D=0 - don't grow)
C9 | 00 | Max height of rescaled bitmaps (D=0)
CA | 2C | Max height of anti-aliased fonts (D=44)
CB | 38 | Max height of cached bitmaps (D=56)
CC | 0D | Max point height for horiz. sub-pixel anti-aliasing (D=13)
CD | 00 | Max point height for vertical sub-pixel anti-aliasing
CE-D8 | 00 | Not used
D9-DB | 00 | UNPLUG bytes 13 to 15
DC | 00 | Not used
DD | 00 | Wimp flags
    Bits 0-3  Wimp drag delay
    Bits 4-7  Wimp auto-scroll delay
DE | 80 | Wimp flags
    Bit  0    Wimp drag delay unit
    Bit  1    Wimp auto-scroll delay unit
    Bits 2-6  Wimp drag move
    Bit  7    Wimp iconise button
DF | 00 | Wimp flags
    Bits 0-3  Wimp double-click delay
    Bits 4-7  Wimp auto-front delay
E0-E3 | 00 | Default Gateway IP Address
E4-E6 | 00 | IP Address of NetBIOS Name Server (octet 3, 2 and 1)
E7-EE | 00 | Not used
EF | XX | CMOS RAM Checksum Re-calculated at save time.
F0-FF | XX | Not used (would be OTP section of 2K NVRAM)
100 | 00 | Miscellaneous
    Bits 0-1  Not used
    Bit    2  On Screen Keyboard format
              0 = Qwerty (D)
              1 = Alphabetical
    Bits 3-7  Not used
101 | 00 | Lower byte of Printer code
102 | 20 | Upper bits of Printer code and Printer flags
    Bits 0,1  Upper bits of Printer code
    Bits 2,3  Printer paper size
              0 = A4 (D)
              1 = US letter
              2 = US legal
              3 = Use general PaperSizes file
    Bit 4     Printer Paper Orientation
              0 = Portrait (D)
              1 = Landscape
    Bit 5     Browser Print Images
              0 = off
              1 = on (D)
    Bit 6     Browser Print Backgrounds
              0 = off (D)
              1 = on
    Bit 7     Not used
103 | 7D | Browser flags
    Bits 0,1  Font size
              0 = small
              1 = medium (D)
              2 = large
              3 = undefined
    Bit 2     Music status
              0 = off
              1 = on (D)
    Bit 3     Beep status
              0 = off
              1 = on (D)
    Bit 4     Scaling
              0 = off
              1 = on (D)
    Bit 5     Display Images
              0 = off
              1 = on (D)
    Bit 6     Display Backgrounds
              0 = off
              1 = on (D)
    Bit 7     Not used
104,105 | CC,08 | Browser Character Encoding flags
    Bits 0-14  17 = Japanese Shift-JIS
               18 = Japanese EUC
               39 = Japanese JIS
               2025 = Chinese Simplified GB2312
               2026 = Chinese Traditional Big Five
               2252 = Western (D)
               4004 = Japanese Auto Detect
    Bit 15     Override the encoding on page
               0 = No (D)
               1 = Yes
106 | 64 | TV Display Settings
    Bit 0     TV Aspect Ratio
              0 = normal 4:3 (D)
              1 = widscreen 16:9
    Bits 1,2  TV Viewing Mode
              0 = Bars
              1 = Reserved
              2 = Crop (D)
              3 = Stretch
    Bits 3-7  TV Standard
              0 = NTSC-4.43
              1 = NTSC-M
              2 = NTSC-M-JP
              3 = PAL-60
              4 = PAL-B
              5 = PAL-B-AU
              6 = PAL-B-IT
              7 = PAL-B-NZ
              8 = PAL-CN
              9 = PAL-D
              10 = PAL-G
              11 = PAL-H
              12 = PAL-I (D)
              13 = PAL-M
              14 = PAL-N
              15 = SECAM-B
              16 = SECAM-D
              17 = SECAM-G
              18 = SECAM-K
              19 = SECAM-K1
              20 = SECAM-L
107,108 | 4F,0B | Miscellaneous Video Hardware Settings
    Bits 0-9    RF Channel in Video Carrier MHz
                847 = Channel 68 PAL-I (D)
    Bits 10-11  SCART Configuration
                0 = Composite
                1 = RGB (D)
                2 = S-Video
    Bits 12     Wide Screen Signalling
    Bits 13,15  Not used
109 | 33 | Network Boot File System Number
10A-10D | 00 | System Time
10E | 00 | Allocated to Customer I
10F | 00 | SPDIF output configuration
    Bits 0-1  PCM output mode
    Bits 2-3  MPEG output mode
    Bits 4-5  AC3 output mode
    Bits 6-7  DTS output mode
where, for PCM, AC3 and DTS:
    0 = on (compressed)
    1 = on (PCM downmix)
    2 = off
    3 = undefined
and for MPEG:
    0 = off
    1 = undefined
    2 = on (compressed)
    3 = on (PCM downmix)
110-113 | 00 | Engineering menu startup key code(s)
114 | 00 | SPDIF output configuration / Dolby audio operational mode
    Bits 0-1  SPDIF SDDS output mode
    Bit 2     Dolby audio operational mode
where, for bits 0-1:
    0 = on (compressed)
    1 = on (PCM downmix)
    2 = off
    3 = undefined
and for bit 2:
    0 = RF mode (dialogue level at -20 dB full scale)
    1 = Line mode (dialogue level at -31 dB full scale)
115-514 | XX | Reserved for Customer N
514-BFF | XX | Undefined
C00-C05 | XX | MAC address
C06 | XX | MAC address checksum

The above table assumes that the hardware platform is PAL. If the hardware is NTSC then the following values default values are set by the OS:

Loc: | Value: | Meaning:
18 | 31 | Territory (USA)
8B | E0 | Time CMOS (GMT-8)
BA | 30 | Configured country (USA)

### NV-RAM Tag File:

The file used to map tags to NV-RAM locations contains lines of the following format.

`<tag>:<byte offset>[,[<bit offset>][,[<length>][,[<default>][,[<flags>]]]]]`

Where `<tag>` is the tag which is looked up (starts with alpha then all alpha-numeric with no spaces), `<byte offset>` is the byte location where the field starts, `<bit offset>` is the bit within the byte at which the field starts, `<length>` is the field length in bits, `<default>` is the default value used in NVRAM reset and `<flags>` is any combination of the following:

    L   Field is locked and cannot be changed. If these values
        are ever altered, then they will be reset to the default
        value when the box reboots.
    P   Field is protected. (not changed during NVRAM reset)

Values can be decimal or hex (if preceded by &). All fields after `<byte offset>` are optional and can either be left off completely or can be left empty in which case they default to the following:

    <bit offset>    0
    <length>        8
    <default>       0
    <flags>         None

The following tags are provided by the NVRAM module for the STB-400:

    IPConfigHostIP3:&000
    NetFSId1:&001
    NetFSId2:&002
    FileSystem:&005,,,46,L
    Unplug0:&006,,,,L
    Unplug1:&007,,,,L
    Unplug2:&009,,,,L
    TVInterlace:&00A,4,1,,L
    TVVerticalAdjust:&00A,5,3,,L
    CapsMode:&00B,3,3,2,L
    AutoRepeatDelay:&00C,,,32,L
    AutoRepeatRate:&00D,,,8,L
    PrinterColour:&00F,,1
    PrinterIgnoreState:&00F,1,1,1,L
    BootState:&010,4,1,1,L
    Unplug3:&012,,,,L
    Unplug4:&013,,,,L
    ExtUnplug:&014,,16,,L
    WimpDoubleClickDelayUnit:&016,,1,,L
    WimpAutoFrontDelayUnit:&016,1,1,,L
    WimpDoubleClickMove:&016,2,5,,L
    WimpAutoFrontIconBar:&016,7,1,,L
    WimpAutoMenuDelay:&017,,4,,L
    WimpAutoMenuDelayUnit:&017,4,1,,L
    WimpIconBarSpeed:&017,5,3,,L
    Territory:&018,,,,P
    PrinterBufferSize:&019,,,,L
    WimpMenuDragDelay:&01B,,4,,L
    WimpMenuDragDelayUnit:&01B,4,1,,L
    WimpIconBarAcceleration:&01B,5,3,,L
    FileSwitchTruncate:&01C,,1,1,L
    MouseType:&01D,,,3,L
    IPConfigIPAddr1:&02A,,32
    IPConfigIPAddr2:&026,,32
    IPConfigIPAddr3:&022,,32
    IPConfigIPAddr4:&01E,,32
    BootServerIP:&038,,32
    LanManNBNS0:&050
    NetBootMount:&051,,208
    IPConfigHostIP012:&06C,,24
    LanManTransport:&06F,,1,1
    IPConfigStaticBoot:&06F,1,1
    IPConfigCIDRLength:&06F,3,5
    CurrentYear:&080,,,0
    CurrentCentury:&081,,,20
    Unplug5:&082,,,,L
    Unplug6:&083,,,,L
    SoundControl:&084,5,3,5,L
    MonitorInfo:&085,,,253,L
    FontSize:&086,,,32,L
    TimeZone:&08B,,,224,P
    DesktopLook:&08C,,1,1,L
    DesktopFont:&08C,1,4,,L
    WimpSpritePrecedence:&08C,5,1,1,L
    WimpButtonType:&08C,6,1,,L
    DesktopTileStatus:&08C,7,1,,L
    Unplug7:&08D,,,,L
    Unplug8:&08E,,,,L
    ScreenSize:&08F,,,,L
    SystemHeapSize:&091,,,,L
    RMASize:&092,,,,L
    SpriteAreaSize:&093,,,,L
    SoundParameters:&094,,,240,L
    DNSIPAddr:&095,,32
    LanManFSBootServer:&09E,,120
    Unplug9:&0AD,,,,L
    Unplug10:&0AE,,,,L
    Unplug11:&0AF,,,,L
    Unplug12:&0B0,,,,L
    PoduleUnplug:&0B1,,64,,L
    Language:&0B9,,,10,L
    Country:&0BA,,,1,P
    NetUnplug:&0BB,,,,L
    ScreenBlankTime:&0BC,3,3,,L
    ScreenBlankWRCH:&0BC,6,1,,L
    MouseMultiplier:&0C2,,,2,L
    ResetStatus:&0C3,2,1,1
    WimpModeStatus:&0C3,4,1,1,L
    ProcessorCacheStatus:&0C3,5,1,,L
    WimpMode:&0C4
    WimpFlagsInstantDrag:&0C5,,4,15,L
    WimpFlagsErrorAction:&0C5,4,1,,L
    WimpFlagsConfinement:&0C5,5,2,3,L
    WimpFlagsSubMenus:&0C5,7,1,1,L
    FontCacheSize:&0C8,,,,L
    FontMaxRescaled:&0C9,,,,L
    FontMaxAntiAliased:&0CA,,,44,L
    FontMaxCached:&0CB,,,56,L
    FontMaxSubPixelWidth:&0CC,,,13,L
    FontMaxSubPixelHeight:&0CD,,,,L
    Unplug13:&0D9,,,,L
    Unplug14:&0DA,,,,L
    Unplug15:&0DB,,,,L
    WimpDragDelay:&0DD,,4,,L
    WimpAutoScrollDelay:&0DD,4,4,,L
    WimpDragDelayUnit:&0DE,,1,,L
    WimpAutoScrollDelayUnit:&0DE,1,1,,L
    WimpDragMove:&0DE,2,5,,L
    WimpIconiseButton:&0DE,7,1,1,L
    WimpDoubleClickDelay:&0DF,,4,,L
    WimpAutoFrontDelay:&0DF,4,4,,L
    DefaultIPRoute:&0E0,,32
    LanManNBNS123:&0E4,,24
    NVRAMChecksum:&0EF
    KeyboardFormat:&100,2,1
    PrinterCode:&101,,10
    PaperSize:&102,2,2
    PrinterOrientation:&102,4,1
    PrinterPrintImages:&102,5,1,1
    PrinterPrintBackgrounds:&102,6,1
    BrowserFontSize:&103,,2,1
    BrowserMusicStatus:&103,2,1,1
    BrowserBeepStatus:&103,3,1,1
    BrowserScaling:&103,4,1,1
    BrowserDisplayImages:&103,5,1,1
    BrowserDisplayBackgrounds:&103,6,1,1
    BrowserEncoding:&104,,15,2252
    BrowserEncodingOverride:&105,7,1
    TVAspectRatio:&106,,1
    TVViewingMode:&106,1,2,2
    TVStandard:&106,3,5,12
    RFChannel:&107,,10,847
    SCARTConfiguration:&108,2,2,1
    WideScreenSignalling:&108,4,1
    SecondaryFileSystem:&109,,,33
    SystemTime:&10A,,32
    CustomerI0:&10E,,8,0
    SPDIFOutPCM:&10F,,2,0
    SPDIFOutMPEG:&10F,2,2,0
    SPDIFOutAC3:&10F,4,2,0
    SPDIFOutDTS:&10F,6,2,0
    EngMenuKeys:&110,,32,0
    SPDIFOutSDDS:&114,,2,0
    DolbyAudioMode:&114,2,1,0
    CustomerN:&115,,8192
    MACAddress:&C00,,48
    MACAddressChecksum:&C06,,8

## 5.0 User interface

This section is not applicable.

## 6.0 Programmer interface

This section is not applicable.

## 7.0 Data interchange

This section is not applicable.

## 8.0 Data formats

This section is not applicable.

## 9.0 External dependencies

There are no external dependenices.

## 10.0 Acceptance test

- The STB-400 NV-RAM must contain the default values specified and the locations must correspond to the specified function.

## 11.0 Non compliances

There are no non-compliances.

## 12.0 Development test strategy

- The default contents of NV-RAM will be compared with this specification.
- Contents of different locations will be changed, the STB rebooted and the contents of NV-RAM checked to ensure the correct values have been stored.

## 13.0 Product organisation

The structure and contents of NV-RAM are stored in the NV-RAM module [2].

## 14.0 Future enhancements

None at the present time.

## 15.0 Glossary

DNS | Domain Name Server.
ID | Identification.
IP | Internet Protocol.
MAC | Machine.
NV-RAM | Non-volatile RAM.
OS | Operating System.
RMA | Relocatable Module Area.
STB | Set Top Box.
RAM | Random Access Memory.
ROM | Read Only Memory.

## 16.0 References

[1] | STB-400 OS ROM Functional Specification (2501,828/FS).
[2] | NV-RAM Software Functional Specification (2207,780/FS).
[3] | RISC OS 3 Programmer's Reference Manual Volume 5a, Acorn Group plc. ISBN 1 85250 172 3. Edition 1 Issue 1 August 1995

## 17.0 History

        A  OLove    07-Oct-1999  Initial release.
        B  SRevill  03-Dec-1999  Updated after review.
        1A ARodger  17-May-2000  Integrated NVRAM as built.
        2  ARodger  12-Jul-2000  Documented Kernel Interaction.
        3  SRevill  12-Jul-2001  Updated to include Customer N allocation;
                                 Corrected the entries of the configured Language;
                                 Made some other minor formatting changes.
        4  SRevill  09-Apr-2002  Fixed Customer N allocation (size wrong in tags file);
                                 Added Engineering Menu startup keys allocation;
                                 Added Customer I allocation.
        5  SRevill  01-May-2002  Juggled the Customers I and N and EngMenu allocations
                                 after finding released EngMenu code which used the
                                 wrong locations (and trashed the Customer I byte);
        6  SRevill  03-May-2002  Added the SPDIF output mode allocations.
        6A BAvison  16-Jul-2002  Added DolbyAudioMode allocation, and the missing SPDIF one.