diff --git a/docs/74ls612.txt b/docs/74ls612.txt
deleted file mode 100644
index 1924c1e..0000000
--- a/docs/74ls612.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-TTL devices can handle CMOS input. HD6309 -> 74LS612
-CMOS devices may or may not handle TTL input. 74LS612 -> peripherals
-
-62256 SRAM, 28C256 EEPROM, 16550 UART all handle TTL input.
-82C42 lists it's outputs as TTL compatible, but says nothing for inputs.
-Must ensure all peripherals are rated for TTL input.
diff --git a/docs/README.MD b/docs/README.md
similarity index 79%
rename from docs/README.MD
rename to docs/README.md
index bb376cb..d698921 100644
--- a/docs/README.MD
+++ b/docs/README.md
@@ -3,7 +3,6 @@
 File descriptions:
 
 - links.txt contains useful links i would like to keep
-- 6809-sn74ls612_timing.md contains notes on the mmu and cpu interface
 - tech-spec.md contains basic info on layout of system (outdated)
 - timing.html contains info on vga timing pulled from https://martin.hinner.info/vga/timing.html
 - vga_ram.txt contains notes on ram size for the vga card