╞IRST, ╔ WOULD LIKE TO SAY TO ═ARK ┴. ─ICKENSON AND ├HARLIE ┘OUNG, GOOD JOB!
╘HIS IDEA FREES UP THE EXPANSION SLOT, REDUCES ╥╞ SHIELDING REQUIREMENTS, SHORTENS THE ADDRESS LINES WHICH REDUCES ERRORS, AND THOSE TWO ╥CA PHONO PLUGS LOOK
SO SLICK STICKING OUT OF THE BACK OF MY ├-128!
─OWN TO BUSINESS. ╔ HAVE ALWAYS USED MY ╥AM╠INK WITH MOST ALL OF MY MUSIC FILESBECAUSE IT MAKES FOR ALMOST INSTANTANEOUS LOADING OF FILES( ╔ HAVE 193 FILES IN MY ╬ATIVE PARTITION OF 4096 BLOCKS AND STILL HAVE ROOM FOR MORE!). ╔ THEN BUILT MY OWN EXTERNAL ╙╔─ BOARD TO GET STEREO SOUND BUT NOTICED THAT THERE WAS QUITE A BIT OF ╥╞ INTERFERENCE THAT ╔ COULDN'T SEEM TO GET RID OF WITH NORMAL ╥╞
REDUCTION PRACTICES. ╔ ALSO HAD TO COMPENSATE FOR THE LACK OF A +12 VOLT LINE
ON THE EXPANSION BUS. ╘O CIRCUMVENT THIS, ╔ BUILT ONTO THE BOARD AN AMPLIFIER TOBOOST THE LEVEL TO MATCH THAT OF THE EXISTING ╙╔─ CHIP. ╬EW PROBLEM CREATED BY
THE AMPLIFIER; ╠OUDER ╥╞ NOISE! ╔ COULD HEAR THE ├╨╒ AND SERIAL BUS ACCESSES!
╘HIS IS PRETTY NEAT FOR A WHILE BUT IF YOU APPRECIATE A LITTLE FIDELITY, DON'T
USE AN EXTERNAL BOARD OF ANY KIND. ╘HE FOLLING WILL DESCRIBE THE STEPS NECESSARYFOR USING THIS INTERNAL SECOND ╙╔─ 6581 CHIP WITH THE BENEFITS OF ╥A.
╞IRST, INSTALL THE SECOND ╙ID CHIP AS DESCRIBED IN FILE # 13091 WITH THE
FOLLOWING EXCEPTIONS;
1. ─O NOT USE PIN 7 OR PIN 10 OF THE CARTRIDGE EXPANSIO
SLOT. ╔NSTEAD, YOU WILL USE THE ╥AM╠INK EXPANSION SLOT'S
PINOUTS 7 OR 10( ╔ USE PIN 7).
2. ╘HIS INSTALLATION WILL ONLY WORK WITH THE ├-1 SINCE
IT DOESN'T REQUIRE THE TIMING CONNECTOR (╙MALL, TWO
TERMINAL PLUG ON THE ╥AM╠INK BOARD ABOVE THE EXPANSION
EDGE CARD). ╠OCATE THE COPPER TRACE LEADING TO THIS
PLUG AND USING A SHARP KNIFE, CUT THE TRACE UNTIL YOU
BREAK THE CONNECTION. ┬OTH TERMINALS ARE FED BY THE
SAME TRACE (┴╘ ╠┼┴╙╘ ╧╬ ═┘ ╥AM╠INK) SO ONCE THIS IS
COMPLETED, US AN OHMMETER TO ASSURE AN ╧╨┼╬ CONDITION
EXISTS. ╘HIS ACT WILL PROBABLY VOID YOUR WARRANTY SO ╔
WOULD WAIT UNTIL IT EXPIRES BEFORE DOING IT!
╠OCATE PIN # 7 OR 10 ON THE ╥AM╠INK PASS-THRU POR WITH YOU FACING THE COMPUTER AND ╥AM╠INK IN THE INSTALLED
POSITIPIN # 1 IS LOCATED ON THE ╠┼╞╘-╚┴╬─ ╞╧╫┴╥─
╥╧╫ OF PINS. ╘HIS IS TRUE OF BOTH ├-64 AND ├-128'S. ├OUNT FROM PIN # 1 TO PIN # 7 OR 10 AND USING A 25 WATT OR LESS SOLDERING IRON, SOLDER A PIECE OF WIRE FROM THIS PIN TO THE TERMINAL CONNECTOR THAT YOU ISOLATED FROM ╥AM╠INK.
╘HIS COMPLETES THE ╥AM╠INK MODIFICATIONS.
3. ╙OLDER THE LENGTH OF WIRE AND THE CONNECTOR GIVEN TO YOU WITH YOUR ╥AM╠INK TTHE ─╨╙╘ SWITCH TERMINAL YOU WOULD HAVE INSTALLED TO THE COMPUTER'S CARTRIDGE EXPANSION
SLOT.
4. ╒PON PLUGGING THE ╥AM╠INK INTO YOUR COMPUTER, PLUG THE
CONNECTOR INTO THE TWO TERMINAL PLUG FIRST AND THEN
├┴╥┼╞╒╠╠┘ PLUG ╥AM╠INK INTO THE EXPANSION BUS SO AS NOT TO PINCH THE WIRE BETWEEN THE CASES.
5. ┬EFORE ASSEMBLY OF YOUR COMPUTER, YOU MAY CONSIDER
BUILDING A SIMPLE ╠┼─ DRIVER TO INDICATE TO YOU WHEN
THE SECOND ╙╔─ IS BEING ACCESSED. ╦NOWING THAT THE CHIP
SELECT PIN (├/╙) # 8 IS ╠╧╫ WHEN ╘HE ╙╔─ IS BEING
ACCESSED, YOU SHOULD USE A ╨╬╨ TRANSITOR TO INVERT THE
SIGNAL FOR THE ╠┼─. ┘╧╒ ═╒╙╘ ╒╙┼ ╙╧═┼ ╙╧╥╘ ╧╞ ╠┼─ ─╥╔╓┼╥
╘╧ ┴╓╧╔─ ╧╓┼╥╠╧┴─╔╬╟ ╘╚┼ ├/╙ ╠╔╬┼! ═OUNT THE ╠┼─ NEXT TO
THE SWITCH. ╫ITH THIS SWITCH, YOU CAN VISUALLY SEE THE
├╨╒ ACCESSING THE ╙╔─ CHIP DURING AN ADDRESS. ╬╧╘┼: ╘HE REASON FOR MODIFYING ╥AM╠INK WAS THAT WHEN TRYING TO BOOT THE COMPUTERWITH THE SECOND ╙╔─ ENABLED, THE SYSTEM WOULD LOCK UP. ╔T SEEMS ╥AM╠INK USES
BOTH ╔/╧ LINES PIN #'S 7 AND 10 FOR ITS OWN PURPOSES. ╔N FACT, DURING ANY TIME WHILE USING MY COMPUTER, ╔ COULD NOT US THE INTERNALLY INSTALLED SECOND ╙╔─ CHIPAS INSTALLED BY THE ORIGINAL FILE #13091 UNTIL ╔ REALIZED THAT THE EXTERNAL BOARD ╔ MADE WAS ACCESSED THROUGH THE PASS-THRU PORT ON ╥AM╠INK. ╘HE LIGHT CAME ON IN MY HEAD SO ╔ USED A JUMPER TO THE PASS-THRU PORT ├/╙ PIN # 7 AND E
SWITCH TERMINAL. ╔T BOOTED UP NICELY AND EVERYTHING WORKED FINE.
╧NE THING ╔ DID NOTICED IS THAT ╔ CANNOT USE ╙NAP╙HOT ╓5 WHILE THE SECOND ╙╔─ IS ENABLED BUT ONE THROW OF THE ENABLE/DISABLE SWITCH AND IT WORKS FINE. ╔
SUSPECT THAT OTHER CARTRIDGES WILL HAVE SIMILAR TROUBLE SO THIS IS WHY ╔
