Amiga Hardware DatabaseCompany C't, Germany | Date 1991 | Amiga A500 | Interface 68000 socket |
- successor of the original PAK-68 (Prozessor Austausch Karte - Processor Exchange Board)
- developed by the editors of the german computer magazine c't
- schematics has been fully published in the magazine
- can be used in 68000 based Ataris and Macs as well
- less error prone design - processing flow with state machines
- the discrete logic had been put into GALs, allowing easy reconfiguration in case of timing changes
- the GAL based layout is smaller, making room for ROM/RAM sockets which were located on piggy-back boards on the old board
- processor
- 68020 @ 14 / 16 MHz, PGA
- optional 68881 or 68882 @ 14 / 16 MHz, PGA - runs at the same speed as the CPU
- memory
- four 32 pin sockets for up to 512 kB ROM / SRAM
- when occupied with ROMs, access to OS ROM is 32 bit wide
- SRAMs with 100ns or faster access speed can also be fitted but an additional decoder GAL is necessary
- ROM access can be sped up by 40% by setting a jumper, which disables ROM synchronisation to the 8 MHz clock
- notes
- plugs into the 68000's socket
- either a 68000 has to be put on top of the board or an additional GAL has to be installed