actually update the readme

2024-10-23 12:48:32 -04:00
parent 027c85d422
commit c1d4d662da
2 changed files with 219 additions and 11 deletions
--- a/6809-board-prototype-1/6809-board-prototype-1.kicad_sch
+++ b/6809-board-prototype-1/6809-board-prototype-1.kicad_sch
@@ -4134,6 +4134,12 @@
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@@ -4951,6 +4991,16 @@
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@@ -7401,6 +7531,16 @@
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 	)
+	(text "NOTE: VERIFY NO-CONNECTS, \nGROUNDED PINS, AND \nBAUDOUT LOOP WITH DATASHEET"
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@@ -9858,7 +9998,6 @@
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-		(mirror x)
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@@ -9866,7 +10005,7 @@
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@@ -10229,6 +10368,73 @@
 			)
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 	)
+	(symbol
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+		(at 270.51 72.39 0)
+		(unit 1)
+		(exclude_from_sim no)
+		(in_bom yes)
+		(on_board yes)
+		(dnp no)
+		(fields_autoplaced yes)
+		(uuid "8caf810c-81dd-4e28-9b2b-d21018fbc9f6")
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+				(path "/73f02399-4449-4d3e-bf52-6d1b4c7a62b4"
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@@ -11597,7 +11803,7 @@
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--- a/README.md
+++ b/README.md
@@ -9,7 +9,9 @@ The MMU will allow up to 2 megabytes of I/O to be paged into the address space.

 The uPD72020 is a very advanced graphics chip for it's time, capable of accelerated drawing of lines, shapes, fills, and characters. It can be coerced into outputting a VGA signal at 640x480 and *maybe* 800x600. 

-Prototype 1 is currently in progress. It will be a much simpler system. It will have no MMU, just the CPU, some RAM, some ROM, and a serial port.
+To avoid the infamous 65C22 bug, the system will use the 16550 UART from the PC ecosystem. It is *relatively* easy to interface this to a 6800 style bus. It has more features than a 65C22 as well. As configured, it will be stable up to 38,400 baud. 
+
+Prototype 1 is currently in progress. It will be a much simpler system. It will have no MMU, just the CPU, some RAM, some ROM, and the UART.

 ## Progress