Amiga Tech Info





CPUs/FPUs & sockets

To make a PCB that plugs into a PGA socket, look for PGA Headers such as from MillMax.
  • 68000 is a 68 pin wide DIP socket at 1.00" pitch
  • 68020
  • 68030
  • 68040 is a 179 pin PGA socket, 18x18 at 0.100" pitch, such as from FCI, Tyco, and at the moment can be had from Newark/Farnell.
  • 68060 is a 206 pin PGA socket, 18x18 at 0.100" pitch, though you can use a 223 pin PGA socket such as Tyco's 5210815-1 or 210815-4, and you can also use these for 68040 as well. You can buy in small quantities from Online Components. Some say the best 060 to buy is the RC50 mask E41J, and some recommend buying from this guy on Ebay.
  • 68881 FPU
  • 68882 FPU

CPU/Accelerator slots/connectors

  • A2000 Accelerator slot is an 86pin edgecard slot, dual-sided, at 0.100" pitch. Pinout can be seen here, though they (and other pinout sites) mistakenly call this "Zorro II". (The Zorro II slots are the 100pin slots on the other side of Buster, not this 86pin slot on the CPU bus)
  • A3000/A4000 Accelerator slot is a 200pin KEL connector. Motherboard uses part# ??? and accelerator uses part# ???.
  • Eyetech AmigaOne XE and MicroA1 use a 300pin MegArray connector made by FCI. The AmigaOne SE I believe had the CPU soldered to the motherboard. This MegArray is the same connector used by Apple in some of their PowerMac machines, but the pinout does not match, and thus we cannot use Mac CPU modules without some kind of adaption between. The motherboard has the plug end, and the module has the receptacle end of the MegArray connection. (double-check that when I can get to a motherboard and pry it apart) These connectors can be found at Mouser for your project needs.

Custom chips

If you want to make a PCB that plugs into a PLCC socket, you'll need a PLCC plug such as from EPboard or Ironwood (please let me know of more suppliers of this kind of thing of you know!) If you have a PCB that you want to put where a PLCC is soldered to your motherboard, remove the chip, put a socket there, and use a plug. If you want to copnnect to a pin of a PLCC chip that is SMT to the motherboard, use a socket upside down on top like a hat. If you want to connect to a PLCC pin of a chip in a socket, use a plug and a socket together and sandwich yuyour PCB innn between them, or use a piece of 30guage wire placed into the socket with the motherboard chip on the correct pin. The wire will be held in place pretty well by being squeesed between the socket pin and chip pin. (Do this by removing chip from socket, get wire in right place, and put chip back into socket). If you want to connect to a socketed PLCC pin while disconnecting that pin from the socket connection, use a piece of 30guage wire that is only half-stripped. Like howto for all-connect here, but leave insulation on socket side of wire while exposing chip side of wire. Or other way around if you want to connect to socket while disconnecting the chip pin. (I need to organize this part better)
  • OCS Denise
  • OCS Agnus
  • A2000 Buster
  • CIA is either a DIP or a PLCC. PLCC is likely soldered to the board.
  • ECS Denise
  • ECS Paula
  • ECS Agnus
  • DMAC
  • A3000/A4000 Super/Fat Buster is an 84pin PLCC. Sometimes socketed, sometimes SMT soldered.

Expansion slots/connectors

  • Zorro2/3 slot is a 100pin edgecard, dual edge, at 0.100" pitch
  • A1000 side slot (right side)
  • A500 side slot (left side)
  • A500 Trapdoor slot
  • A600
  • CD32 expansion port I'm told is an MCA (Vesa Local Bus) 182 pins connector.
  • Clockport

Service Manuals, Schematics and other Tech books

  • Some schematic diagrams for various Amiga computers and peripherals have been posted here. Some of the scans are hard to read though, you may still want to search sellers or Ebay for print copies of what you want. Though note that A4000T service manual doesn't seem to have ever been for sale, or there were only a couple copies out there. I've tried very hard to buy one and haven't found it anywhere, but a scan is posted at this site.
  • Service manuals were available in print books for a large number of Commodore/Amiga computers, monitors, addon cards, etc. Check remaining Amiga dealers or on Ebay. A few are also online, though seem to be hard to read.
    • A3000T (Tower) service manual included a thorough spec of the Zorro3 bus and other good info.
  • The Dave Haynie Archives has some specs such as for Zorro3 and addendum, FatBuster, register descriptions, hardware designs, and some interesting Amiga history. I found it offline for a while recently but it's back. If' it's missing again, most everything can also be found in the Wayback Machine.
  • The Amiga A500 / A2000 Technical Reference Manual had a lot of information about making addon cards, Zorro2 spec, etc. This seems to be quire rare, I've only ever seen it available once on Ebay in a somewhat water damaged condition. But a slightly moldy book is better than nothing I guess to have a legit copy.
  • RKM (Rom Kernel Manual) books include Libraries, Includes & Autodocs, Devices, Hardware Manual. The newest set of these is from the OS3.0/3.1 days, but they are invaluable information even for OS4.x coders. The Hardware Manual is of course about Classic Amiga computers, but talks about how these motherbaords talk to other hardware, and Devices talk about how AmigaOS drivers work. Hopefully there will be a good documentation set for OS4.x like these. Check Ebay, used stuff at Amazon, or remaining Amiga dealers. A lot of this is also on the Amiga Developer CD.