Editing Commodore Plus/4 (section)

=== Specifications ===
[[File:Plus4 main board.jpg|thumb|Main board]]
[[File:Plus4 Interface.jpg|thumb|I/O ports]]

* CPU: [[MOS Technology]] [[MOS Technology 6510#MOS 7501/8501|7501/8501]], approximately {{nowrap|0.88 [[megahertz|MHz]]}} when the raster beam is on the visible screen and {{nowrap|1.77 [[megahertz|MHz]]}} ([[PAL]]) / {{nowrap|1.79 [[megahertz|MHz]]}} ([[NTSC]]) the rest of the time<ref name=DatorMuseum />
* RAM: {{nowrap|64 KB}}, of which nearly {{nowrap|60 KB}} (60671 bytes) is available to [[Commodore BASIC|BASIC]] users. There are known RAM expansions with {{nowrap|256 KB}} and 1 [[Megabyte|MB]]<ref name="circuit">{{Cite web|url=http://www.zimmers.net/anonftp/pub/cbm/documents/projects/memory/plus4/|title = /Pub/CBM/Documents/Projects/Memory/Plus4/}}</ref>
* ROM: {{nowrap|64 KB}} including [[Commodore BASIC|Commodore BASIC 3.5]], a [[machine code monitor]], and TRI-Micro's "3 Plus 1" (word processor, spreadsheet, database, graphing). It is possible to add up to {{nowrap|64 KB}} more ROM with [[ROM cartridge|cartridges]].
* Graphics: [[MOS Technology TED]] (TED 7360)
* Text mode: 40×25 characters ([[PETSCII]]). There are three text modes: standard, extended color, multicolor
* Graphics modes: 160x200 (multicolor, 2bpp, no sprites) / 320×200 (hi-resolution, 1bpp) at 121 colors (all can be visible at the same time)
* I/O ports:
** Tape connector (for [[Commodore 1531]] Datassette with {{nowrap|[[Mini-DIN connector#7-pin|7-pin mini-DIN]]}}; incompatible with C64, although adapters allowing the machine to use earlier and aftermarket datasettes were common.)
** [[ROM cartridge]] slot (incompatible with C64)
** Two [[Mini-DIN connector#8-pin|8-pin mini-DIN]] [[game controller]] ports (incompatible with C64)
** Commodore serial bus (compatible with C64)
** User port (for modems and nonstandard devices, incompatible with C64)
** [[Composite video]] connector including [[S-Video]] and mono audio signal (compatible with C64)
** [[RF modulator]] to TV antenna connector (compatible with C64)
* The power connector is compatible with C64 power supplies in some Plus/4s and takes the same 9V AC and 5V DC voltages, but uses a non-standard "Square DIN" plug, like the C128, in most Plus/4s.