5-21 some testing

Author: thecodingchicken

_posts/2020-01-01-color_design.md

@@ -14,3 +14,15 @@ I want to lay out the basic building plans here, mainly about color and design c
 | Orange  | Reset   | Reset lines				   |
 | Violet  | LEDs    | wires for LED display boards |
 | Brown   | Misc    | Flags, other listed things   |
+
+
+
+### 4-16 decoders
+| Register | Input | Output | Input&Output IRL |
+|----------|-------|--------|------------------|
+| C | 		 1010  | 1111 | 	1111  	1111 |
+| D | 		 1011  | 1110 | 	1101	0111 |
+| E | 		 1100  | 1101 |		0011	1011 |
+| F |		 1101  | 1100 |		1011	0011 |
+| G |		 1110  | 1011 |		0111	1101 |
+| H |		 1111  | 1010 | 	1111	0101 |

_posts/2025-05-20-ram.md

@@ -0,0 +1,8 @@
+## Ram
+
+I'm going to be using a 62256-70 32kx8 ram chip, as that'll be plenty of ram for the program to use.  
+For the MAR, I'm going with two 74hc377's, although 74hc574's would work just as well.  But I already bought a bunch of the 377's so I might as well use them, LOL.  
+
+
+...
+That was the end of the day LOL

_posts/2025-05-21-testing.md

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+## Testing it all!
+
+Today I have some time to test, but I haven't had much time recently at all.  I'm going to start off by testing out the registers, which is complicated slightly by the [74hc154's](https://www.jameco.com/Jameco/Products/ProdDS/45401.pdf), but not by much.  There's a lot that I have to make sure I wired right, and while I probably should have started earlier, now's a better time than never, right?
+
+<figure>
+  <div>
+  <img src="{{site.url}}assets/img/Screenshot_20250521_210250.png" alt="74hc154 pinout"/>
+  </div>
+  <figcaption>{{"74hc154 pinout and truth table"| markdownify}}</figcaption>
+</figure>
+
+For the general purpose registers, going left to right, they're 10-15 on the 154's, which means HLHL to HHHH (and using the jumpers, it's reversed to LHLH ) as the truth table is MESSED UP, where a is the LSB...
+
+---
+
+So here's a funny fact
+I mixed up the order of these decoders, OOPS...
+so here's the new order (and this is put in DCBA order, pin order irl is ABCD)
+
+(It's now been moved to one of the frequently-updated documents [here](https://thecodingchicken.github.io/2020/01/01/color_design.html) )
+
+
+Well, I think the registers are all set, which is nice.  I don't think I'm going to test the A&B registers, as well as the ALU right now as I want to setup LEDs for those on a board.  (I also don't have that many jumpers free to view all of those right now.)  
+
+I'll have to start working on that soon, but that'll mean running a BOAT load of purple LED wires, which will make these boards even less portable than they are.  
+
+---
+
+Well, that's it for today, hopefully tomorrow I'll have more time for this.  I doubt it, given the hours I want to work and all that.  The next best chance will be Saturday evening, or Sunday morning/afternoon&evening.  
+
+I think my next target will be to finish the current clock, and start testing out everything else(PC, ALU).  I only had a couple errors in the registers module, namely the DIR pin(needed to be 5v instead of ground to get it to go A->B), a wire was in the wrong order for one of the decoders, and the order is messed up.  But, that's not too bad given the literal mess of wires.  I _might_ have swapped a bit somewhere, but that'll take thourough debugging with a completed system, or at least something much further than what currently exists.  
+It's also getting closer to the time where I need to purchase a board to start building it all out on, as that'll get me to the point where I can hook things up to the bus for real, as right now I have 6 completed(ish) modules, and 3-4 more that I need to wire up that will all have to be connected to the bus.  And once I have a permenant bus wired up, I can start doing simple things like counting up and down, outputting values to a register, etc.  Half of this build will be overcomplicated but it's MY build, so I do it MY way.  :-)