14 September 2014, 15:31 | #1 |
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A2000 Fast CPU Port - Signal Information
Hello my fellow EAB'ers.
Wow its been a while since I have posted a thread - so it's fitting it should be hardware related. Currently I am creating *something* for the FAST CPU port of the A2000, however after much research I am struggling to find more information on the following Signals. [pin 11] _COPCFG [pin 20] _BOSS [pin 14] _C3 [pin 16] _C1 _COPCFG is multiplexed by U606[ 74LS32 ] for each Zorro II port CN601 to CN605 and changes state pending CFGOUT1 to 4 and CFGIN1 to 4 Does anyone have any good sources to read for this signal? _BOSS from what I have managed to find out is AND'ed with _BGACK [pin 62] by U303[ 74F08 ] - how is _BOSS set ? From my study I have isolated both _C3 as a quadrature clock - CCKQ and _C1 is CCK (pixel clock?) but are these shifted since they are premised by "_" ? Thanks for reading, any help is invaluable. |
15 September 2014, 10:32 | #2 | |
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Quote:
Perhaps it is the same as AUTOCONFIG(tm) _CFGOUT outputs on common Zorro slots. Need to read more on how CPU slot is handled in A2000 PS Check page 94 of http://classiccomputers.info/down/Co...anual_1987.pdf for the description of _COPCFG and _BOSS signals Last edited by tnt23; 15 September 2014 at 10:39. |
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15 September 2014, 10:42 | #3 |
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Awesome!
thanks for the help tnt23! |
15 September 2014, 11:04 | #4 |
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Cheers mate Glad to see you being up to something!
I guess you've already figured those clocks signals as well. Anyway, _C1 is said to be Code:
3.58 MHz clock synched to the falling edge of the 7.16 MHz system clock. Also known as /CCK in some places. Pin 16 Code:
3.58 MHz clock synched to the rising edge of the 7.16 MHz system clock. Also known as /CCKQ in some places. Pin 14 |
15 September 2014, 15:49 | #5 |
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15 September 2014, 17:16 | #6 |
Ya' like it Retr0?
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Ahhhh you guys are AWESOME!
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