diff --git a/downloads/README.md b/downloads/README.md
index 31aa8df..1ba7c13 100644
--- a/downloads/README.md
+++ b/downloads/README.md
@@ -2,7 +2,7 @@
 | ---------------------------------------------------------------------- | ----------------------------------------------------------------------- | -----------:| -------:|
 | [SIMMProgrammer1.0.3-mac(ub)](SIMMProgrammer1.0.3-mac(ub)).zip         | SIMM Programmer version 1.0.3, Mac OS X 10.4 (PPC and Intel) and higher |    Jul 2013 | 13.7 MB |
 | [SIMMProgrammer1.0.3-mac](SIMMProgrammer1.0.3-mac).zip                 | SIMM Programmer version 1.0.3, Mac OS X 10.5 (Intel) and higher         |    Jul 2013 | 13.0 MB |
-| [SIMMProgrammerFirmware1.2](SIMMProgrammerFirmware1.2).bin             | SIMM Programmer board firmware version 1.2 Jul 2013                     |    Jul 2013 | 10.3 KB |
+| [SIMMProgrammerFirmware1.3](SIMMProgrammerFirmware1.3).bin             | SIMM Programmer board firmware version 1.3 Nov 2020                     |    Nov 2020 | 11.2 KB |
 | [SIMMProgrammer1.0.3-win](SIMMProgrammer1.0.3-win).zip                 | SIMM Programmer version 1.0.3, Windows XP and higher                    |    Jul 2013 |  5.5 MB |
 | [SIMM Revision 3](SIMM Revision 3).zip                                 | Mac ROM SIMM (2 MB) board layout revision 3                             |    Aug 2012 | 18.5 KB |  
 | [Mac ROM SIMM Programmer PCB 1.0](Mac ROM SIMM Programmer PCB 1.0).zip | SIMM programmer schematic and PCB layout version 1.0                    |    Aug 2012 | 94.9 KB |  
diff --git a/downloads/SIMMProgrammerFirmware1.2/README.md b/downloads/SIMMProgrammerFirmware1.2/README.md
index 43fcf07..82d1a9f 100644
--- a/downloads/SIMMProgrammerFirmware1.2/README.md
+++ b/downloads/SIMMProgrammerFirmware1.2/README.md
@@ -11,11 +11,11 @@ If your programmer board's firmware somehow becomes corrupted, you can fix it by
 
 Version history:
 
-1.2: Adds support for only programming/erasing a portion of the SIMM. Also adds support for programming and reading individual chips on the SIMM.
-1.1.1: Adds support for verifying while writing
-1.1: Adds support for 8 MB ROM SIMM
-1.0.1: Adds LED blinking during read and write operations
-1.0: Initial release
+- 1.2: Adds support for only programming/erasing a portion of the SIMM. Also adds support for programming and reading individual chips on the SIMM.
+- 1.1.1: Adds support for verifying while writing
+- 1.1: Adds support for 8 MB ROM SIMM
+- 1.0.1: Adds LED blinking during read and write operations
+- 1.0: Initial release
 
-#SHA1 Checksum:
+# SHA1 Checksum:
 `97af5c2e4fb3b402e797d58bd292befcd7f806f3`
diff --git a/downloads/SIMMProgrammerFirmware1.3/README.md b/downloads/SIMMProgrammerFirmware1.3/README.md
new file mode 100644
index 0000000..36d5faa
--- /dev/null
+++ b/downloads/SIMMProgrammerFirmware1.3/README.md
@@ -0,0 +1,22 @@
+# File:
+[SIMMProgrammerFirmware1.3.bin](SIMMProgrammerFirmware1.3.bin)   11.2 KB
+
+# Abstract
+SIMM Programmer board firmware version 1.3
+
+# Description:
+This is a new firmware that has been completely reorganized under the hood. The only visible change to users is that it is much faster than the previous version 1.2. Programming an 8 MB SIMM now only takes about 2:28. Previously it took 8:42.
+
+If your programmer board's firmware somehow becomes corrupted, you can fix it by uploading this file using the SIMMProgrammer software by going to the Advanced menu and selecting "Update firmware...".
+
+Version history:
+
+- 1.3: Massive speedup and under-the-hood reorganization
+- 1.2: Adds support for only programming/erasing a portion of the SIMM. Also adds support for programming and reading individual chips on the SIMM.
+- 1.1.1: Adds support for verifying while writing
+- 1.1: Adds support for 8 MB ROM SIMM
+- 1.0.1: Adds LED blinking during read and write operations
+- 1.0: Initial release
+
+# SHA1 Checksum:
+`292c9961397eefa7d713a51982a43fe4`
diff --git a/downloads/SIMMProgrammerFirmware1.3/SIMMProgrammerFirmware1.3.bin b/downloads/SIMMProgrammerFirmware1.3/SIMMProgrammerFirmware1.3.bin
new file mode 100644
index 0000000..d168a4d
Binary files /dev/null and b/downloads/SIMMProgrammerFirmware1.3/SIMMProgrammerFirmware1.3.bin differ