Amiga Hardware Database Expansion cards



Turbo Amiga CPU (A2000) Photo
Company
Computer System Associates, USA
 Date
1986
 Amiga
A2000
 Interface
CPU slot
 
    processor card - Turbo Amiga CPU (CSA 00992)
  • 68020 @ 14.3 MHz, PGA, synchronous
  • Turbo Amiga CPU (CSA 00992B): 68881 @ 14.3 MHz, PGA, synchronous
  • Turbo Amiga CPU (CSA 00992D): 68881 up to 25 MHz, PGA, asynchronous
  • the 14.3 Mhz chips are overclocked 12 MHz units
  • when addressing the Amiga custom chips or the motherboard memory, the 68020 throttles back to 7 MHz
  • rev 4.2 motherboards have to be modified (a trace has to be cut and a jumper installed) to get the CPU card work, rev 3.9 motherboards work without problems
  • 68000 fallback mode selectable by jumper
    optional static memory card - Turbo Amiga Memory (CSA 00993)
  • without this RAM card, the 68020 performs 15% slower than the original 7 MHz 68000, because of the additional time it takes to generate 24 bit addresses for the motherboard memory
  • the card fits into a free Zorro slot, but instead of transmitting data via the Zorro bus, it attaches directly to the CPU card via four ribbon cables, and create a 32 bit memory bus
  • with the memory card installed, performance is increased to 2.8 times of a standard A2000
  • sixteen 32 pin DIP sockets for up to 2 MB static RAM
  • takes 32k×8 or 128k×8, 100 ns SRAM chips in groups of four
  • the sockets can also take four 28 pin 64k×8 ROM chips containing Kickstart 1.2.2
  • does not autoconfig its memory
  • multiple Turbo Amiga Memory cards can be installed
    optional 16 bit RAM card adapter - DragStrip
  • allows using two 16 bit Zorro II RAM cards as a 32 bit RAM expansion
  • consists of a converter card (16/32 Bit Converter) and a connector board for the RAM cards (StepLadder)
  • the converter card has to be installed in the first Zorro II slot (closest to the CPU slot) and connects to the CPU card via the same four ribbon cables
  • the connector board with the RAM cards are placed between the CPU and converter cards
  • any Zorro II RAM cards work like the Commodore A2052 or A2058
  • the converter card has four 28 pin DIP sockets for 64k×8 ROM chips containing Kickstart 1.2.2
    notes
  • the first 32 bit accelerator system for the Amiga
  • all of the cards have four diagnostic LEDs for the four ribbon cables
  • does not work with the Commodore A2090 hard disk controller - CSA has its own hard disk system for the card

    Photo
    Computer System Associates Turbo Amiga CPU (A2000) - DragStrip 16/32 Bit Converter front side
    DragStrip 16/32 Bit Converter, front side

    Computer System Associates Turbo Amiga CPU (A2000) - CPU card Rev B front side
    CPU card Rev B, front side

    Computer System Associates Turbo Amiga CPU (A2000) - CPU card Rev D front side
    CPU card Rev D, front side

    Computer System Associates Turbo Amiga CPU (A2000) - CPU card Rev B back side
    CPU card Rev B, back side

    Computer System Associates Turbo Amiga CPU (A2000) - SRAM card front side
    SRAM card, front side




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