I built an SMD Apple ROM replacement board for Apple ][, ][ plus and ][ europlus.
NOTE : This is not a new design - well I've substituted in the 39SF010A flash chip (most use a 27c256 eprom), but the overall concept has been around a while. This is the first SMD one I've seen though, and certainly the most compact!
This board replaces all 6 ROMs on the motherboard - you can leave most of the original ones in the sockets as it will overide them - install the board by removing the D0 ROM plus the 74LS138 to the right of it (position F12), then plug this board into the vacated sockets. It takes up no more space that the outline of the 2 sockets it plugs into.
There is a jumper that allows you to select from 2 different sets of ROMS - Applesoft Basic with Autostart F8 ROM (as per the Apple ][ plus, ][ europlus), or Integer Basic with the non-autostart F8 ROM as per the original Apple ][. If you have a Language Card with the Autostart F8 ROM on it, that will take over from the onboard ROM as per normal.
With the Integer Basic ROM set I've included the Programmers Aid ROM.
The ROMs used :
APPLESOFT D0 - 341-0011
APPLESOFT D8 - 341-0012
APPLESOFT E0 - 341-0013
APPLESOFT E8 - 341-0014
APPLESOFT F0 - 341-0015
APPLESOFT F8 - 341-0020 AUTOSTART MONITOR
INTEGER D0 - 341-0016-00 PROGRAMMERS AID
INTEGER E0 - 341-0001-00
INTEGER E8 - 341-0002-00
INTEGER F0 - 341-0003-00
INTEGER F8 - 341-0004-00 NON-AUTOSTART
This is a handy board to have when troubleshooting a system as you now have a set of known good ROMs - especially given the pin rot that some of the original 40 year old ROMs seem to get (the legs get very fragile and can snap off easily - originals are a 9316 masked ROM and are expensive to replace
- original masked ROM sets seem to fetch high prices on eBay).
It also allows you to remove all your originals and put them in safe keeping!
Here it is installed :