HDTenEightyP/CompuServe · Datasets at Hugging Face

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The DRAMs you need to acquire are 256K, 150 ns access time. The industry part number is 41256-15. They can be obtained at many electronics parts houses, mail order and Radio Shack. The Radio Shack P/N is 276-1252. Their price is $6.95 each. With the recent embargo on memory IC's look for these to become harder and harder to find. You will need a quantity of eight. The following steps should only be undertaken by someone skilled in handling PCB's and soldering. Some mechanical skill is needed to remove and install the PC board in its housing.

NOTE: Be careful to avoid ESD (Electrostatic Discharge) damage to your PCB assembly. If possible, use a wrist strap attached to a grounded metal pipe or such. Only a few hundred volts of Electrostatic potential can completely ruin your REU.

STEP 1 - The housing of the 1764 must be opened. There are 4 pins, one in each corner. Starting at the opening which connects the unit to the computer gently, but firmly, pull the top and bottom apart. The plastic case will begin to separate. Continue around the perimeter of the case until the top can be removed from the bottom.

STEP 2 - Remove the metal shield from the plastic case by pulling it out at each corner. The PCB is inside this metal shell. Open the shield starting at the connector opening. You may need a small screwdriver to bend the metal slightly where the two lips meet. When the shield opens, spread it only as far as needed to remove the PCB.

STEP 3 - Examine the PC board. Bank I is the row of eight IC's along the top edge of the board. The RAM Expansion Controller (REC) is the square component in the middle of the board. The Bank II row is just below Bank I.

STEP 4 - Your PCB was most likely wave soldered. Therefore, the holes that you must insert the new IC's in are already filled with solder. The best way to remove this solder and open the holes is with a vacuum desoldering tool. One can be purchased at Radio Shack (P/N 64-2120) for only $6.95. Make this investment. You be glad you did! Remove the solder from all holes; 128 in all. Be careful of how much heat you apply during this process. Do not break or pull up any of the traces attached to the holes that you are desoldering.

STEP 5 - If you are using IC sockets, solder them into the board with the pin 1 end towards Bank I. Then insert the new IC's into the sockets being careful to engage all pins in the proper sockets. If you are not using the sockets, solder the actual IC's into the board with the pin 1 end toward Bank II.

STEP 6 - Reassemble the unit in the reverse order of disassembly. Be sure everything fits properly as it was before you began.

STEP 7 - The REU will now hold twice as much as before. If you are a GEOS user, you will see that 512K is installed when you use the CONFIGURE file. You can now shadow two drives, or have one drive shadowed and one RAMDISK.

If the REU is not operating properly please check the following:

A pin (or pins) is not soldered correctly.

A trace (or traces) is broken (open) and not making contact.

A solder bridge exists between two adjacent traces or holes.

One (or more) IC is defective. Almost all DRAMs receive 100% testing during manufacturing. This is an unlikely reason for improper operation. However it is still a possibility.


Obviuosly, this task is only for those who know how to solder and desolder a PCB. If you are in doubt about doing this, then DON'T! You have more to lose than to gain. If you know someone who is so skilled then ask them to do it. I will accept no responsibility whatsoever for what losses you may incur.

My REU worked perfectly right off the bat. If you follow instructions exactly as I have outlined them, then your REU should work too. Good luck.



COMMODORE 64 FILE ARCHIVE UTILITY



Documentation for Version 2.20
(C) Copyright 1986 - Ampere Metal
All rights reserved.




ARC VERSION 2.20 PAGE - 2



FREEWARE

User supported software, or FREEWARE is an attempt to
bypass normal market channels thereby allowing independant
software authors to enter the market without the high cost
of conventional advertising and promotion. You benefit by
having these savings passed on to you, and we benefit by not
having to invest in costly advertising, fancy manuals and
packaging. After all, if the software does the job, who
needs the fancy package!

If the software does not do the job, then simply do not
use it and pay nothing; pass it on to someone else, maybe
they will find it useful. At least it didn't cost you
anything to experiment.

On the other hand, if you find yourself still using the
program after a couple of weeks, then obviously it is of
some worth to you and you should send in a contribution
reflecting that worth.

ARC is distributed as FREEWARE.

ARC is not FREE softWARE.

If you use ARC regularly, then you should send in a
contribution. If all you can afford is a couple of bucks,
then send in a couple of bucks...its better than nothing at
all. If you havn't sent in a contribution, then you should
not be using ARC.

Contributions should be sent to:

Ampere Metal
80 Hale Road unit 4
Brampton, Ontario
Canada.
L6W 3M1

A minimum contribution of $10.00 gets you printed
documentation A minimum
contribution of $20.00 gets you a current program diskette
as well. If you contribute a minimum of $20.00, you will
also be eligible to purchase updates at cost. (Documentation
at $0.06/page + $2.50 for diskette + $2.50 postage)

Please be sure to include your correct address and
postal/zip code.

The DRAMs you need to acquire are 256K, 150 ns access time. The industry part number is 41256-15. They can be obtained at many electronics parts houses, mail order and Radio Shack. The Radio Shack P/N is 276-1252. Their price is $6.95 each. With the recent embargo on memory IC's look for these to become harder and harder to find. You will need a quantity of eight. The following steps should only be undertaken by someone skilled in handling PCB's and soldering. Some mechanical skill is needed to remove and install the PC board in its housing.

NOTE: Be careful to avoid ESD (Electrostatic Discharge) damage to your PCB assembly. If possible, use a wrist strap attached to a grounded metal pipe or such. Only a few hundred volts of Electrostatic potential can completely ruin your REU.

STEP 1 - The housing of the 1764 must be opened. There are 4 pins, one in each corner. Starting at the opening which connects the unit to the computer gently, but firmly, pull the top and bottom apart. The plastic case will begin to separate. Continue around the perimeter of the case until the top can be removed from the bottom.

STEP 2 - Remove the metal shield from the plastic case by pulling it out at each corner. The PCB is inside this metal shell. Open the shield starting at the connector opening. You may need a small screwdriver to bend the metal slightly where the two lips meet. When the shield opens, spread it only as far as needed to remove the PCB.

STEP 3 - Examine the PC board. Bank I is the row of eight IC's along the top edge of the board. The RAM Expansion Controller (REC) is the square component in the middle of the board. The Bank II row is just below Bank I.

STEP 4 - Your PCB was most likely wave soldered. Therefore, the holes that you must insert the new IC's in are already filled with solder. The best way to remove this solder and open the holes is with a vacuum desoldering tool. One can be purchased at Radio Shack (P/N 64-2120) for only $6.95. Make this investment. You be glad you did! Remove the solder from all holes; 128 in all. Be careful of how much heat you apply during this process. Do not break or pull up any of the traces attached to the holes that you are desoldering.

STEP 5 - If you are using IC sockets, solder them into the board with the pin 1 end towards Bank I. Then insert the new IC's into the sockets being careful to engage all pins in the proper sockets. If you are not using the sockets, solder the actual IC's into the board with the pin 1 end toward Bank II.

STEP 6 - Reassemble the unit in the reverse order of disassembly. Be sure everything fits properly as it was before you began.

STEP 7 - The REU will now hold twice as much as before. If you are a GEOS user, you will see that 512K is installed when you use the CONFIGURE file. You can now shadow two drives, or have one drive shadowed and one RAMDISK.

If the REU is not operating properly please check the following:

A pin (or pins) is not soldered correctly.

A trace (or traces) is broken (open) and not making contact.

A solder bridge exists between two adjacent traces or holes.

One (or more) IC is defective. Almost all DRAMs receive 100% testing during manufacturing. This is an unlikely reason for improper operation. However it is still a possibility.

Obviuosly, this task is only for those who know how to solder and desolder a PCB. If you are in doubt about doing this, then DON'T! You have more to lose than to gain. If you know someone who is so skilled then ask them to do it. I will accept no responsibility whatsoever for what losses you may incur.

My REU worked perfectly right off the bat. If you follow instructions exactly as I have outlined them, then your REU should work too. Good luck.

COMMODORE 64 FILE ARCHIVE UTILITY

Documentation for Version 2.20

ARC VERSION 2.20 PAGE - 2

FREEWARE

User supported software, or FREEWARE is an attempt to

bypass normal market channels thereby allowing independant

software authors to enter the market without the high cost

of conventional advertising and promotion. You benefit by

having these savings passed on to you, and we benefit by not

having to invest in costly advertising, fancy manuals and

packaging. After all, if the software does the job, who

needs the fancy package!

If the software does not do the job, then simply do not

use it and pay nothing; pass it on to someone else, maybe

they will find it useful. At least it didn't cost you

anything to experiment.

On the other hand, if you find yourself still using the

program after a couple of weeks, then obviously it is of

some worth to you and you should send in a contribution

reflecting that worth.

ARC is distributed as FREEWARE.

ARC is not FREE softWARE.

If you use ARC regularly, then you should send in a

contribution. If all you can afford is a couple of bucks,

then send in a couple of bucks...its better than nothing at

all. If you havn't sent in a contribution, then you should

not be using ARC.

Contributions should be sent to:

Ampere Metal

80 Hale Road unit 4

Brampton, Ontario

Canada.

L6W 3M1

A minimum contribution of $10.00 gets you printed

documentation A minimum

contribution of $20.00 gets you a current program diskette

as well. If you contribute a minimum of $20.00, you will

also be eligible to purchase updates at cost. (Documentation

at $0.06/page + $2.50 for diskette + $2.50 postage)

Please be sure to include your correct address and

postal/zip code.