28 August 2008, 23:44 | #1 |
Vegetable Lasagna
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Calling All 1200 Experts!
I need some (more) help from one of our resident hardware experts...
I'm trying to figure out exactly what the numbered spots/solder points are for. With #8 I know that the bottom set of pins are for the case LEDs so I'm wondering about the set of pins above it (I worried that making the box smaller would lead to confusion). I suspect that this information might be available on a schematic but I don't have nearly enough knowledge to figure one of those out. Any answers would be more appreciated. Thanks in advance. |
28 August 2008, 23:54 | #2 |
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I'm pretty certain number 3 was for a maths co-processor...
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29 August 2008, 00:09 | #3 |
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I think #4 is "remainder" clock-port connector points.
#8 has my floppy drive plugged in above the case leds. Last edited by meega; 29 August 2008 at 00:19. |
29 August 2008, 00:28 | #4 |
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no 5. is for a Real time clock
no. 6 EDGE-90 Memory Bus Expansion(very OLD! model) and Real-Time Clock/Calendar no 3. is deffo the fpu - 68881 68-pin PLCC I'm getting info from here although it's not fully complete... http://www.amigahistory.co.uk/a1200info1.txt |
29 August 2008, 00:28 | #5 | |
Vegetable Lasagna
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That seems logical given the size and shape.
That makes sense as it is right beside the other one. Quote:
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29 August 2008, 03:37 | #6 |
Ya' like it Retr0?
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1. Test Point [TP 1 and 2]
2. Test Point [TP 3] 3. FPU 68882 4. Clock Port Header 5. Clock chip 6. DRAM Port 7. defunct component 8. LED/Power Header 9. Activity Coupling 4. This is infact Clock Port 2 6. This was intended as the a chip ram expansion as the A1200 was gonna have 1MB) 9. Here is the Activity Coupling for the LED's, you can add a small trimpot to the arrary and give yourself PCMCIA Activity LED |
29 August 2008, 05:09 | #7 |
Vegetable Lasagna
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29 August 2008, 05:35 | #8 |
I hate potatos and shirts
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Maybe. Nobody even try. Neither the soldered FPU, nor the PCMCIA activity LED (wait! this was made!). The problem is the shape of the clockport boards, all intended to fit just on the right cp.
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30 August 2008, 12:16 | #9 |
Hamster tamer
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Nope, no 'clock port' signals there. The unused pins on P9B are just D0-15 of the chip ram data bus, +5v and ground.
Edit: BTW, both P9B+P9A were the connections for the 1MB chip ram expansion. When they decided to ship with 2MB, they removed all the pins for the expansion except for those needed for an RTC.. so the right side of P9B got known as the 'clock port' |
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