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- introduction to the c128
-
- The Commodore 128 (aka C128) was
- Commodore Business Machines final 8
- bit computer (the C65 doesn't count as
- it was never completed & never
- commercially released). Introduced at
- the January 1985 CES, it was the
- follow-up to the Commodore 64 & was a
- vastly expanded & more poweful
- successor to that computer.
-
- The C128 features : CP/M mode via a
- secondary Zilog Z80 CPU in 40 & 80
- column modes Enhanced & faster 6510
- (the 8502) running at 2MHz Native 40 &
- 80 column modes in two speeds (1 &
- 2Mhz) Near 100% compatible C64 mode
- Basic 7.0 - more poweful & flexible
- than the limited C64's Basic 2.0
- Numeric keypad Burst mode disk access
- 128k of RAM with more available for
- programmers due to an MMU
-
- The 128 was released in three models -
- the first looked like the a larger 64C
- (& the design was repeated in the
- later Amiga 500, 600 & 1200) - the
- "flat" 128. The second model was a
- rather nifty plastic box with a carry
- handle & slide in keyboard that
- allowed the machine to become a
- "luggable" (the 128D) & the last model
- was the metal cased cost-reduced
- variant (the 128DCR). The 128DCR also
- came with a 64k VDC as opposed to the
- earlier models 16k chip (they could be
- retrofiited).
-
- Although the computer sold in excess
- of two million units during its
- lifespan, native software was thin on
- the ground due to the included 64 mode
- - developers didn't bother creating
- software that took adantage of the
- native modes. However, there are
- several fine business packages
- produced for the 80 column mode & due
- to the CP/M compatibility (& it's
- ability to handle multiple CP/M disk
- formats) a large library of software
- was available right from the start.
-
- about our site AND Mission statement :
- To provide an active & vibrant
- community devoted to keeping the
- Commodore 128 alive (hence the name of
- the site) into the future.
-
- To gather together in one place as
- much relevant material as possible &
- to provide a "one stop shop" for the
- C128 community.
-
- To foster a friendly & sharing
- Commodore 128 community.
-
- To provide accurate information &
- discussions about the Commodore 128.
-
- To promote an active development
- scene for the Commodore 128.
-
- To preserve & distribute Commodore
- 128 related software, manuals & code.
-
- And above all - to have a good time
- while we're doing it!
-
- Commodore 128 hardware information The
- C128's hardware basically remained the
- same across all three models. It
- consisted of :
-
- 128kb of RAM (externally expandable
- via an REU) 8563 VDC chip driving the
- 80 column RGB display with either 16k
- of RAM or 64k of RAm in later models
- (& easily retro-fitted) - in the
- 128DCR this was replaced with an 8568
-
- VT-100 style keyboard with a numeric
- keypad 8502 CPU - an expanded 6502
- which could run in either 1MHz mode or
- 2MHz mode (the 40 column screen turned
- off at the higher speed) Secondary
- Zilog Z80 CPU that controlled the
- startup of the computer & allowed it
- to run CP/M in either 40 or 80 column
- mode. Although this was a 4MHz chip,
- it was constrained to 2MHz due to the
- requirements of interfacing with the
- 8502
-
- A reset button
-
- MMU bank switching chip In the two
- later models, the keyboard was
- detachable The 128D models also
- contained a built in 1571 disk drive 2
- KB 4-bit dedicated color RAM for the
- VIC-II E MOS 8580 SID chip for sound -
- this was the cost reduced version,
- earlier 128's had the 6581 SId as used
- in the C64
-
- RGBI video output allowing the
- computer to connect to a standard CGA
- monitor but with an additional
- monochrome composite signal as well
-
- There are three basic models of the
- Commodore 128
-
- The original "flat" version, broadly
- similar in looks to the 64C, Amiga
- 500, 600 & 1200. This model came
- equipped with the 16k VDC & had no
- internal disk drive.
-
- The Commodore 128D was an attempt to
- produce a more "business-like" looking
- PC and was in a low profile plastic
- box with an internal 1571, stowable
- keyboard & a retractable handle that
- made the computer a luggable. It still
- had the 16k VDC. This PC also had an
- internal fan.
-
- The Commodore 128DCR was the final
- version released. The CR stood for
- "cost reduced". This release came in a
- sturdy metal case, dispensed with the
- fan, had a reduced number of chip
- components & had the 64k VDC.
-
- Text Reprinted from the website
- http://www.commodore128.org/index.html
-
-
- ...end...
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