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Old 24 December 2005, 12:38   #1
Miggy Man
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Can anyone help me? I am looking for pinouts of the following:

A500 Side expansion
A500 Trapdoor
A600 Trapdoor
A500/500+/2000/CDTV 68000 CPU
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Old 24 December 2005, 13:03   #2
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A500 side expansion:

5 +5V 6 +5V
7 NC 8 -12V
9 NC 10 +12V
11 NC 12 GND (CFGOUT?!)
13 GND 14 /C3
15 CDAC 16 /C1
17 /OVR 18 XRDY
19 /INT2 20 NC
21 A5 22 /INT6
23 A6 24 A4
25 GND 26 A3
27 A2 28 A7
29 A1 30 A8
31 FC0 32 A9
33 FC1 34 A10
35 FC2 36 A11
37 GND 38 A12
39 A13 40 /IPL0
41 A14 42 /IPL1
43 A15 44 /IPL2
45 A16 46 /BERR
47 A17 48 /VPA
49 GND 50 EClock
51 /VMA 52 A18
53 /RST 54 A19
55 /HLT 56 A20
57 A22 58 A21
59 A23 60 /BR
61 GND 62 /BGACK
63 D15 64 /BG
65 D14 66 /DTACK
67 D13 68 R/W
69 D12 70 /LDS
71 D11 72 /UDS
73 GND 74 /AS
75 D0 76 D10
77 D1 78 D9
79 D2 80 D8
81 D3 82 D7
83 D4 84 D6
85 GND 86 D5
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Old 25 December 2005, 08:59   #3
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Old 26 December 2005, 19:50   #4
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Thanks very much Chain, that is GREAT
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Old 27 December 2005, 06:37   #5
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but doesn't include the pinouts for the A500 Trapdoor or A600 Trapdoor...
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Old 27 December 2005, 14:52   #6
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Those prove difficult to find unfortunately

Also looking for A1200 clockport pinout too now
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Old 28 December 2005, 06:57   #7
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From usenet:

                 A600 Trapdoor Expansion Connector Pinouts

                mapped by Bruce Abbott (bhabb...@inhb.co.nz)

    ExRAM pin      designation        Description
    ---------      -----------        -----------

    1-2            +5V                +5 volt power supply
    3-4            GND                ground
    5-20           DRD0-15            DRAM data bus
    21-22          GND                ground
    23-31          DRA0-8             DRAM address bus
    32             nc
    33-34          ???                internal chipram strobes?
    35             CASL               DRAM Column Address Strobe, lower
    36             CASU               DRAM Column Address Strobe, upper
    37             RAS0               DRAM Row Address Strobe 0
    38             RAS1               DRAM Row Address Strobe 1
    39             /WE                DRAM Write Enable
    40             /ROE               DRAM Output Enable
    41-48          RGA8-1             Custom Chip Register Address bus
    49-56          D0-D7              CPU data bus
    57-60          A1-A4              CPU address bus
    61             /NETCS ???         spare I/O select ?  (Gayle pin 14)
    62             /SPARECS ???       spare I/O select ?  (Gayle pin 15)
    63             /INT2              level 2 Interrupt Request
    64             /INT6              level 6 Interrupt Request
    65             LAUD               left audio output from Paula
    66             RAUD               right audio output from Paula
    67             14M                14.3 Mhz system clock
    68             nc
    69             CCK                color clock (3.58Mhz)
    70             /BRESET            buffered reset
    71             /IOR               I/O read for Real Time Clock
    72             /IOW               I/O write for Real Time Clock
    73             /RTC_CS            Real Time Clock Chip Select
    74             nc
    75             ???                grounded via a 470 Ohm resistor
    76             +5V                +5 volt power supply
    77-78          GND                ground
    79             +12V               +12 volt power supply
    80             -12V               -12 volt power supply

 note: nc = no connection
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Old 31 December 2005, 23:15   #8
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Thanks to you too
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Old 10 January 2006, 01:25   #9
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I couldn't even imagine what you'd need to know to be able to use those pinouts to make something. I've even taken several circuit design/theory classes at college and still would have no idea what to do with this information. Anyone want to give an example of what you can make if you knew the pinouts, obviously you can't make your own accelerator boards, but what simple hardware can be made?
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Old 10 January 2006, 10:12   #10
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Make your own non-autoconfig RAM board to plug into the amigabus connector?
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Old 12 February 2018, 02:52   #11
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Any one know what the LAudio and RAudio is used for on the Amiga 600 expansion?? Does it mean you could put a DSP chip in the expansion port? What about the 14mhz clock??

Thanks in advance.
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Old 12 February 2018, 19:49   #12
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All port, expansion, chip, and external socket pinouts are pretty clear in the schematics for each model:
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Old 12 February 2018, 20:02   #13
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The 14MHz_A signal is output directly from Agnus, which will be the master clock frequency divided by two (so not exactly 14MHz, but close).
So basically a separate system clock that may or may not be 180 deg out of phase from the clock the rest of the chips use.

Left and Right are audio outputs. They might be dead ends at the connector, you’d have to check the actual PCB for that.
Some models also have upper address bits labelled at expansion connectors which don’t actually go anywhere.
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Old 13 February 2018, 10:36   #14
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Yep, memory expansions similar to the original ones back in the day are probably the most obvious use. Perhaps the simplest device you could make for each is based around the RTC or clock port:

- A500 trapdoor: Real-time clock. One chip and a few other components are all that's needed.
- A600 trapdoor: As above for the RTC, but also an A1200-style clock port should be possible using nothing but the required connectors and a board. This would enable the connection of various other peripherals.
- 68000 socket: Accelerators are more complicated, but fast RAM boards are simple enough. Simpler still is the addition of a clock port, though it's more complicated than the A600 trapdoor version because the A500 lacks some necessary signals. Reconstructing these signals (and dealing with the CPU bus) takes a few logic chips, but is simple enough.
- A500 side slot: Basically anything including all of above. A simple project is an add-on Zorro-II slot that lets you connect a Zorro card to the A500. Just requires one chip and a few other parts.

I think if you're looking to start designing peripherals however, perhaps have a look at something more straightforward, like a relay board for the parallel port or something like that. This should get your mind ticking over with possibilities without requiring too much in the way of dealing with RAM, chip selects and other such things.
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