Commodore  CBM 630
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Commodore CBM 630 (B256 + CoProcessor)

The commodore CBM 630 is the same machine as the CBM 620, sporting 256KByte instead of the 128KByte of the CBM 610. It also provides an extra curcuit board that allowed for an Intel 8088 co-processor, very little software, if any, exists that takes advantage of this co-processor.

The CBM 630 computer is functionally the same as the CBM 730 computer, but with an 8x8 pixel character ROM, as opposed to the 8x14 pixel characters of the 730. The case is the same as that of the CBM 500 series.

CBM 630/730 Coprocessor Board

The optional co-processor board for the CBM 630/730 with the Intel 8088 processor, giving the 630/730 the ability ro run CP/M-86 1.1 or MS-DOS 1.25. This board did not give IBM PC Compatibility.

Commodore CBM 600 Series

The Commodore 600 series was introduced in 1982 and sold in the US as the B128 / B256 and in Europe as the the CBM 600 series. The B128/600 series are in an identical case as the B500 series but have the MOS 6509A CPU running at 2MHz. The VID-II video chip was not used for this series, since it targeted the business market. Instead, the 6545 CRT Controller was used so that 80 columns could be displayed.

The following configurations were sold:

  • CBM 610 (B128) - 128KByte RAM
  • CBM 620 (B256) - 256KByte RAM
  • CBM 630 (B256) - 256KByte RAM + CoProcessor board

The 600 series uses the 6509A CPU clocked at 2MHz and has 40KByte ROM with BASIC 4.0. An additional 704KByte of external RAM is supported through bank switching. Some of the other capabilities and peripherals were:

  • MOS 6551 ACIA chip with an RS232-C port
  • IEEE-488 compatible peripheral port
  • MOS 6581 SID for sound
  • MOS 6525 TriPort Interface (TPI) Chip for the keyboard
  • MOS 6545 CRT Controller for 80x25 monochrome text**

** Graphics were limited to 80x25 characters with a 8x8 character matrix

MOS 6509 CPU

THe MOS Technology 6509 is an enhanced version of the 8-bit 6502 CPU. Using bank switching the 6509 is able to address up to 1MByte of RAM. The 6502 also could do bank-switching, but did so via separate logic circuits, the 6509 had this logic built in. This extra logic made the 6509 difficult to program, and it was mainly used in the Commodore CBM-II line of computers.

Source:WikiPedia - MOS Technology 6509
Source:WikiPedia - MOS Technology 6502

SID (MOS 6581) - Sound Interface Device

SID is short for Sound Interface Device. It is the name of the sound chip that was used in the VC10, the commodore 64 and the Commodore 128. SID was developed by Bob Yannes, an employee of MOS Technology. Bob was not only an engineer but also knew a lot about music. His intention was to create a different sound chip than other devices at the time. He implemented a subtractive synthesis chip. The chip's distinctive sound is easily recognized and was clearly ahead of the ocmpitition. The SID combines analog and digital circuitry that cannot be 100% emulated, even today.

Source: C64 Wiki
Technical Details
Released 1982 Brand Commodore Type Commodore CBM-II 600 Series Name CBM 630 CPU Class 650x CPU MOS 6509 @2MHz, Optional Z80 or Intel 8088 Memory RAM: 256kB Sound Chip SID (MOS 6581) Sound 3 Voices, 9 octaves Display Chip MOS 6545 CRTC (80 column) Display 80x25 Monochrome text Best Text 80x25 Best Color monochrome Best Graphics Text Only Sprites none System OS BASIC V4.0
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World Wide Web Links
WikiPedia: MOS Technology 6581
Wikipage about the 6581