CPU Front Panel

CPU Front Panel

ELF Membership board:

3.5" x 2.15" (fits in an Altoids candy tin)

1802 CPU (with adjustable RC clock oscillator)

one 28-pin memory socket (for standard 2k-32k byte RAMs or EPROMs)

8-bit output port (OUT5 or OUT7)

8-bit input port (IN5 or IN7)

expansion header with all I/O and 1802 signals

operates on 3v-6v at under 1ma (plus whatever the particular memory chip you use requires)

ELF Front Panel board:

3.5" x 2.15" (plugs onto the Membership board)

9 individual LEDs (D0-D7, plus Q)

11 subminiature toggle switches (D0-D7, Clear/Wait/Load/Run, and Memory Protect -- exactly like original ELF)

25-pin DB25 connector to go to PC parallel port

The PC connection allows the PC to completely control the front panel; and thus load, examine, and run programs, and read/write to the I/O ports.

Parts List

Membership board parts list: [revised 3/22/10]

C1      22pf NPO ceramic capacitor, 0.1" lead spacing

C2-4,6  0.1uF Z5U or X7R ceramic capacitor, 0.1" lead spacing

C5      0.047 farad 5.5v memory backup capacitor, 0.465" dia, 0.2" lead spacing (PC board hole too big)

D0-8    LED, T1-3/4, color of choice

D9,10   signal diode, 1N4148 etc.

D11     zener diode, choice:

1N5231B 5.1V (cheap but uses higher current)

or 1N5232B 5.6V (use with regulated 5V supply)

or 1N4625 5.1V low poer zenor (micropower)

J1      30-pin header, 0.025" square pins on 0.1" centers (wirewrap length preferred)

J2      DB25F female 25-pin D connector, with #4 mounting hardware

J3-6    jumpers, .1" spacing, to short pins in P2 and P3 (configuration for U2)

P1abc   MOlex KK top entry socket, 10 pin, Digikey WM3241-ND (need 3)

P2      5-pin header, 0.025" square pins on 0.1" centers, from 36-pin header

P3      4x2 pin header, 0.025" square pins on 0.1" centers (2 removed)

P4      4 pin header, 0.025" square pins on 0.1" centers

R1      trimpot, Bourns 3266W or eq, 0.25" square, 0.1" lead spacing

R2      15k 5% 1/4w resistor

R3,6    100k 5% 1/4w resistor

R8-10   470k 5% 1/4w resistor <---changed 3/22/10 HRJ see this note

R4      470k 5% 1/4w

R5      100k x 8, 9-pin SIP, one side bussed

R7      1meg 5% 1/4w resistor

R11     1K 10-pin SIP, 9X1K

R12,13  100K 8 pin SIP, 7 X 100K

S0-10   submini toggle switch SPDT right angle (Digikey KCN1059-ND, $5+)

S11     submini momentary switch SPDE (Digikey CKN1740-ND, $4.87)

U1      CMOS CPU, CDP1802, use 40-pin low profile socket (Mouser 575-393640, $4)

U2      2k-32k CMOS RAM (6116, 6264, 62256) or EPROM (27C16-27C256)

        use 28-pin low profile socket (Mouser 575393628, $3)

U3,7    CMOS octal latch, 74HC373

U4      CMOS quad 2-input NAND gate, schmitt trigger, 4093

U5      CMOS dual D flip-flop, 4013

U6      CMOS octal buffer, 74HC244 or 74AHCT244

U8      CMOS 4071 quad 2-input OR

U9      CMOS 74HC257 multiplexer

Front panel board:

C6      0.1uF Z5U or X7R ceramic capacitor, 0.1" lead spacing

D0-D8   LED, T1-3/4 high brightness

J2      DB25F female connector, PC mount

P1      30-pin female top entry socket for J1, Molex KK series

    Molex 22-18-2101 (10-pos; use 3)

P4      4-pin header, 0.025" pins on 0.1" centers

R8-10   100k 5% 1/4w

R11     1k x 9, 10-pin SIP, one side bussed

R12,R13 100k x 7, 8-pin SIP, one side bussed

S1-10   SPDT toggle switch, C&K T101 series

S11     SPDT pushbutton switch

U8      CMOS quad 2-input OR gate, 4071

U9      CMOS quad data selector, 74HC257

Altoids brand, tin candy box

Jumper

Jumper

Jumper settings is near the cmos battery.To clear the BIOS or CMOS settings password,date,time and to reset the BIOS settings,this jumper is placed alternatively and again replace to original position

Those who want to install a 2.5" notebook hard disk in a typical desktop PC - if only for data synchronization - can use an adapter like this one.

Warning: In most cases, notches in the connector provide protection against reverse insertion or pin alignment/mismatch problems, but older cut-rate cables may lack these features. To prevent mishap, please obey the following rule: the side of the cable that's marked with a colored line (usually red) always attaches to the connector on the motherboard on the side that's labeled with the number 1, both for hard disks and CD/DVD drives (in fact, the stripe denotes the lead associated with pin 1 in the pin block). At the same time, the marked side of the ribbon cable should always be oriented toward the side of the drive where the power cables attach. Also, careful examination of the cable connectors and device or motherboard pin blocks show that both are missing a pin or a hole in the middle of one row. By matching up the missing pin on the drive or motherboard with the missing hole on the ribbon cable connector, correct alignment is always guaranteed.

One ribbon cable can handle two devices, such as a combination of two hard disks or a hard disk and a DVD player or burner. When two devices share a ribbon cable, one must always be configured as the master, and the other as a slave. This configuration usually requires setting a jumper as shown in this picture

Heat Sink

Lets put this in simple words, Processors are attached with motherboard via their connecting socket, different processors have different socket architecture. AMD uses AM2 / 939 / 940 where as Intel is using same LGA775 socket architecture for a long period of time.

And what’s a heat sink ??

When processors run, they generate a lot of heat, heat sink is an environment or object that absorbs and dissipates heat from another object using thermal contact (either direct or radiant).

So, is there any difference between LGA775 heat sicks ??

Infact though they look the same for all processors, but underneath they are different. Intel Celeron and Intel Core 2 Duo doesn’t come with exact same one !!

Let us take a look at some of the Intel default LGA775 heat sinks.

They may look same from the out side, but when you take a look at them from in-side, you may spot the difference !!

Let us take a look at their diagrams,

This bellow one would be a LGA775 of Intel Core 2 Duo E6xxx and E8xxx and Core 2 Quad Q6600 / Q6700,

Where as this (bellow) one is a LGA775 heat sink of Intel Pentium Dual Core / Core 2 Duo E4xxx / Pentium 4 5xx / 6xx / Celeron D

and as the Pentium D / Pentium eXtreme Editions runs at 3 GHz and higher thus generating a lot of heat so this type of heat sink are supplied with them.

The best would be these bellow type LGA775 which comes with top line Core 2 Extreme and Core 2 Quads (45nm),

Many of us upgrades our system from Pentium 4 to Pentium D or Core 2 range processors. Some time one may find that processor fan is faulty with their new system, and just to save time and money involving in warranty issue, they simply install the older Heat sink and fan with their new system.

Now as you may see,most of the time though the socket is LGA775 and all heat sink looks the same, but underneath they are quite different.

So it is always recommended to use the proper heat sink which is meant for your system, or a better one (if you know what you are doing).

CMOS or BIOS Battery

CMOS  or BIOS Battery

* 1your clock starts running slowly

    * when you boot (start) your computer it has a problem finding your hardware (no hard drive, no cd rom)

To change the battery you need the following tools:-

    * a X-point screwdriver

    * an anti-static strap

    * a new battery (without it what are you changing)

** unplug all the cables from the back of the computer as you remove them make a note where they came from. (always rember where the plugs goes back)

* Make sure the power is off

    * There are sharp edges and all so be carefull

    * Do not remove unnecessary plugs and all-they will have big effect on the computer

    * Do not damage anything inside the case

Hard Disk SATA Cables

Hard Disk SATA Cables

The SATA Cable is connect to the Hard Disk and Main Board .It has 7 pins.The Data Transfer is Followed by the cable the first pin and fourth pin and seventh pin are GND and Empty Tracks.

The SATA Power Cable is 15 pins. it has 5v power supply to hard disk directly to S.M.P.S.

The red wire is Positive Black is Negative.Yellow is GND.

SATA Data Cable is Master Slave Configuration for Mother Board.

Hard Disk ID Cables

Hard Disk ID Cables

The Hard disk controller is used to connect the interface cable in the motherboard

It is 40 pin cable one pin is empty. There are 39 pins placed. The Data Transfer From Hard disk To Mother board and DVD Drive to Main Board. The collection of data is transfered.

It is Master Slave Configuration for Mother Board to Harddisk and DVD drive only Data Transfer Method.

Trust 4 Port USB Hub

Trust 4 Port USB Hub

Ters have several types of information cables that support a wide variety of hardware devices, and allow data to be transferred to your PC from cell phones, cameras, external hard drives, mice, keyboards, printers, and even wireless network adapters.

The most common type of data cable is a USB cable (Universal Serial Bus - which is a protocol for transferring data to and from digital devices). USB 2.0 is the latest version of this protocol, and it supports data transfer rates of 12 Mbps, which is several times faster than a high-speed DSL broadband internet connection.

Trust Computer Products provides a complete, innovative and affordable range of technological products. A key principle in developing products is to propose a solution, pleasure, relaxation and pleasure for the user, the principle target to fulfill. Product Features: Compact 4-port USB hub, ideal for laptop users; connect up to four USB peripherals to a single port USB; Activities protected from over current levels; option for an external power source provides power to connected equipment, hot-swappable, plug and remove peripherals at any time; Fully Windows Plug and Play, including protective carry bag and Velcro straps.