In fact the description of the modification does not only explain the mod from replacing the regular clones with 4164 chips instead of the 4116 chips - but it also contains explanation how to perform the mod with those clone versions that instead are populated with one row of 4164 chips and instead replace them with selected 41256 chips !

And the description also contains the listings of the machinecodeprograms that are used to access the additional memory !

the wiring in the top left corner is not related to the 4116 to 4164 upgrade. It is only related to another mod that permits to switch the cpu from 1.xx Mhz operation to 2.xx Mhz operation mode.
The text to that mod will be treated in a later publishing of another page on "tuning" of the cpu on cloneboards

- and the second switch is related to the switching of the character ROM from german to english version and vice versa

-  and the third switch is related to the hardswitching of the 80-card.

The cramapple-version of the modification for example uses the four annunciators of the gameport to switch the banks of the RAM to the upfront of the adressing and access of the 6502 and the additional RAM-space is used as a RAM-peudo-floppy-disk that emulates a floppydisk. The software availiable to this modification permits to load software from floppydrive to the additional RAM-space and flush the content od that pseudofloppy to a disk in s diskdrive. The cramapple-modification-software only operates with DOS. It is the first kind of this modification published in the public.

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The Phantom is in fact just nearly the same an the cram-apple-modification with one important difference of the software quite similar to the cram-apple-modification and could in fact - related to the hardware part of the modification just be claimed to ba a later german-translationm of the modification working with the same trick. But due to the fact that this modification had been published later the guys that had distributed this german version had performed some kind of update to the software and the software distributed with the hardware-chip-kit and instruction offered a disk that not only offered the use of the pseudo-disk in DOS but additional software that permitted the use of the floppy-emulation also with apple-UCSD-pascal and with CPM !

In fact this modification was published and the hardware ( chips and socket ) about 2 years later than the cram-apple-modification and it can be called a clone of the cram-apple-modification except the fact of the additional software extension to UCSD-Pascal and CPM.

link to disk image will be added soon.

The c´t version of the modification is the latest and most sophisticated version of the upgrade from 48 kB to 192 kB. The first big difference is the fact that it is complete different from the other both modifications in the point that it does NOT USE THE GAMEPORT as a specific "adress / bank / switching" like the other two modifications.

The other two modifications always had the lack that the additional software and a part of the hardware had to be deactivated if the apple was used with games that offered use of the switches of the paddles or joystick. That wasn´t a real disadvantage at the early days of the apple ][ - because in those days there were only very few games availiable to the apple ][.

And another big difference was that the both other versions in fact basicaly could only be used with the pseudo-disk-emulation. The use by the programmer for additional RAM-work-area for example as additional hires-/ or lores-pages in the software was restricted by the fact that the TPA area conflicted with the "primary-original-RAM-bank" and that for example made difficulties while compilation of the programs with a compiler.

This new modification offered an entire new kind of access to the additional memory and it offered not only the use as RAM-disk but in fact the user could also use the additional memory with slight modification also to get CPM 3.0 running at this kind of modification ! The big difference is that this modification uses own chips for the decoding of the additional RAM and therefor there is no conflict with any game and it is the genious coup of this modification that the relevant "switches" that are requested for the handling of the additional RAM are in fact related to the area reserved for the cassette interface and some unused area located within the area of the slots but unused area above and below of the real slots !

This is in fact a complete new and alternative kind of modification. The modification to the cloneboard above at the entry of this page is based on the  c`t modification !

Throughout the developement of the different 3 modifications in the time from 1979 till February 1987 ( when this modification had been published in the german c`t magazine) I have performed on 3 clone-boards each of the modifications and finaly the last one published in c´t was the one that finally convinced me.

The fact that it offered a switch to simply ensure the compatibility to original apple ][ was the one argument and the second was the fact that adressing was performed with "switch-code-area" that was located in an reserved and unused adressspace that ensured that no conflict will occure with any other kind of software due to the fact that this area is really abandoned by any kind of regular software and the fact that the cassetteinterface is out of use for years due to the fact that in normal systems only disks or harddisks are used as storage devices.

At the moment i´m locked up in several private duties and therefor this modification is just introduced in short scetch and without translations - but in 4 to 5 months when the running "tasks" have been solved i´ll take myself time to perform translation of the german text to english.

link to disk image will be added soon.

translated description
 of the c´t- modification
in english language

description
ct´modification
( german )