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--- blog:286_shootout_vlsi_vl82c201 [2021/05/27 18:26] – [Conclusion] john
+++ blog:286_shootout_vlsi_vl82c201 [2021/05/27 18:47] (current) – [Addendum - Shadow RAM / UMB Support] john
@@ Line 206: / Line 206: @@
 Unfortunately there's no labelled jumpers on this motherboard m(
-Through trial and error, and reading the {{:blog:286:chipset.doc|}} documentation included with //The Last Byte//, it seems that shadow RAM control is by pin #69 of the chip. Checking for continuity from that led me to a set of jumpers just above it - which were shorting to ground. Removing the jumper from
+Through trial and error, and reading the {{:blog:286:chipset.doc|}} documentation included with //The Last Byte//, it seems that shadow RAM control is by pin #69 of the chip. Checking for continuity from that led me to a set of jumpers just above it - which were shorting to ground. Removing the jumper from J16, below:
 {{:blog:286:img20210527191631.jpg?600|}}
+//Note to self: it was in position 3-4, furthest away from the board edge//, this lead the board to start up with 3712KB of RAM, versus 4096KB. A good sign. On booting Dos and watching //The Last Byte// load, I was greeted with this more successful looking banner:
+{{:blog:286:lastbyte_vlsi_working.png?600|}}
+**However**.
+Once //The Last Byte// has loaded, the system is incredibly unstable - with the keyboard or screen locking up at frequent intervals.
 (Go back to the [[blog:286_pc|286 PC main page]])