Posted By
MMS
on 2019-11-08
12:33:49
 |  Re: rediscoverd +4
Welcome here!
One of the best collected information and diagrams is Zimmers by Bo Zimmerman.
Plus4world has a lot of information too on the Hardware section, and want to highlight SVS Ultimate Map that provides one of the best collection of details on SW/HW
Bo's page is full of very interesting articles, projects and also a lot of interesting and rare pictures.
I really like the huge GEOS pack he provides.
The schematics you are looking for is at:
http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/plus4/index.html
(there are a lot of Hungarian origin drawings too)
A lot of C64 project can be used with Plus/4 too, especially the IEC and User Port related ones (the later one is more similar than we though, especially in serial mode)
Also worth to check out Solder's (a legendary German HW developer) page, when some of Hanner and Csory's stuff is also available. Huge memory expansions, EPROM or SRAMs with schematics. Most of them requires internal modification, only for the brave hearted!
http://solder-synergy.de/plus4/hardware/index.html
On the forum you can find a lot of useful recent project regarding new PLA, new ROMs and in case the 8501 died, some solutions (based on 6502 or 6510). These are very useful to reduce the heat inside the Plus/4, extend it's lifetime, and able to repair dead ones.
If you have IEC floppy drive (or SD device) I highly suggest to use JiffyDOS, and it is available for Plus/4 too.
It results a huge increase in loading speed (8-10x),an 1541 becomes faster than an 1551.
The SD based devices usually support it natively, and fortunately some clever guys created a sw based implementation of JiffyDOS, you can load into memory and use the external device with higher speed.
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