My ][ europlus original ROMs are dead, so I added a https://www.ebay.fr/itm/Apple-II-plus-and-europlus-ROM-replacement-board-replaces-D0-D8-E0-E8-F0-F8/283900202214
My goal was to get 64K of RAM. I've been lucky to score an original Apple Language Card on ebay in France, this week-end (not very common here).
When booting a disk with the card, some games did work, but many others didn't (for instance Oregon Trail). Booting a DOS 3.3 disk would fail to show the BASIC prompt.
I got a clue from a game that went from complaining that I had no 64K extension (before the card) to complaining that I didn't have 64K OR I had no BASIC ROM installed.
When booting and RESEting to the monitor I could see that the E000 space contained garbage (every read were different), so I figured out that the Apple Language Card was in some sense re-enabling the empty ROM slots of the motherboard (ie: I would get the Autostart ROM from the card, and nothing else).
Looking at schematics, I suspected that the /INHIBIT line from the card was responsible for this remapping.
I added a small piece of sticker on pin 32 of the card, and re-inserted it. Bingo, everything seems to work fine, and I have 64K of RAM!
Q1: is this a common issue? Would another way of replacing the ROMs not be subjected to this problem?
Q2: are there better ways than a sticker on one of the card pins? I am worried that it may have long term impacts on the slot or the card itself.
Thx in advance