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boards:ecb:bus-monitor:start [2016/02/27 14:38] admin |
boards:ecb:bus-monitor:start [2016/04/16 20:44] admin |
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ECB bus monitor features: | ECB bus monitor features: | ||
- | * Displays state of ECB bus address lines [A0-A15], data lines [D0-D8], and control lines using LEDs | + | * Displays state of ECB bus address lines [A0-A15], data lines [D0-D7], and control lines using LEDs |
* Allows the builder to single step through instructions | * Allows the builder to single step through instructions | ||
* Allows the builder to set " | * Allows the builder to set " | ||
Line 15: | Line 15: | ||
Note: Newer RBC processor cards have extended the address and data lines beyond what this card can display. | Note: Newer RBC processor cards have extended the address and data lines beyond what this card can display. | ||
- | This board was derived from information in an article published in | + | This board was derived from information in an article published in the " |
===== Hardware Documentation ===== | ===== Hardware Documentation ===== | ||
+ | Current Version: | ||
+ | |||
{{: | {{: | ||
{{: | {{: | ||
- | Manufacturing Files: | + | Manufacturing Files: |
- | KiCAD Files: | + | {{: |
+ | |||
+ | For information on early prototype boards, see the [[boards: | ||
===== Build Information ===== | ===== Build Information ===== | ||
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==== Default Positions of Switches ==== | ==== Default Positions of Switches ==== | ||
- | < | ||
- | From: Don Caprio < | + | From: Don Caprio < |
- | Date: Sat, 02 Apr 2011 16:22:25 -0700 | + | Date: Sat, 02 Apr 2011 16:22:25 -0700 \\ |
- | Local: Sat, Apr 2 2011 7:22 pm | + | Local: Sat, Apr 2 2011 7:22 pm \\ |
- | Subject: Re: [N8VEM: 9121] Re: ECB Bus Monitor | + | Subject: Re: [N8VEM: 9121] Re: ECB Bus Monitor |
- | Hey, I got my bus monitor working. That is lights blink, status and data LED' | + | Hey, I got my bus monitor working. That is lights blink, status and data LED's are responsive. Address LED's flicker during boot and running CP/M commands. |
- | are responsive. Address LED's flicker during boot and running CP/M commands. | + | |
- | This was totally a high tech approach :) I looked at the home page of the N8VEM. | + | This was totally a high tech approach :) I looked at the home page of the N8VEM. You see a picture of the bus monitor. If you look very closely you can pretty much tell |
- | You see a picture of the bus monitor. If you look very closely you can pretty much tell | + | what the position of the switches are. I set mine as pictured and it now it works. I still would like to know what the switches are and what functions they provide. |
- | what the position of the switches are. I set mine as pictured and it now it works. | + | |
- | I still would like to know what the switches are and what functions they provide. | + | |
Set all address switches to ON (SW_1_2 & SW_3_4). | Set all address switches to ON (SW_1_2 & SW_3_4). | ||
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Turn switch position 5 ON (SW2) | Turn switch position 5 ON (SW2) | ||
Turn switch position 4 and 5 ON (SW1) | Turn switch position 4 and 5 ON (SW1) | ||
- | </ | ||
+ | ==== Notes on Operation ==== | ||
+ | For what it's worth, what I've been able to decode from the schematic is as follows: | ||
- | ===== Videos Demonstrating Operation | + | |
+ | SW_HEX_1_2 and SW_HEX_3_4 are " | ||
+ | |||
+ | |||
+ | SW1 4&5 allow RD and MREQ to generate a signal that is used to update the displays. You can use SW1 to select any of WR, MREQ, RD, RFSH,IORQ, and/or M1 (switches 3..8 respectively) to enable the latches - which l guess is a great little debugging aid - you can check the bus only on writes, reads, or memory or I/O transactions, | ||
+ | |||
+ | |||
+ | SW2-5 enables the output of SW1 to be used as a source for the latching clock. Other sources are the address match signals, enabled on SW2-1 (H4 nybble)..SW2-4 (H1 nybble). One or all of these triggers can be used to " | ||
+ | |||
+ | |||
+ | There are some other refinements (SW1-1 for example) that naybe only a German speaker will be able to figure out... Or the designer of the bus monitor board itself? | ||
+ | |||
+ | |||
+ | I hope this helps! | ||
+ | PCP | ||
+ | |||
+ | ==== Videos Demonstrating Operation ==== | ||
See the [[boards: | See the [[boards: | ||
===== Photo Gallery ===== | ===== Photo Gallery ===== | ||
- | {{gallery> | + | {{gallery> |
===== File List ===== | ===== File List ===== | ||
- | + | {{filelist> | |
- | {{filelist> | + |