Check that Speed!
I wanted to test the upgrades I have been doing, and particulary wanted to see the speed difference between
the 16K of VDP (the RAM that comes in the console) and the added 32K of 16-bit RAM.
Thierry Nouspikel wrote a
little Assembly program which tests the RAM. For those of you not familiar with Thierry's website please go
Below is the code that Thierry wrote:
Below is a table which shows the above code running with different settings on my console. Keep in mind that not
all software will take advantage of the 16-bit RAM. Programs that only use the 16K VDP RAM will not, but any
program that requires the 32K expansion will.
With standard RAM Setting (Switch in defeat postition)
With Fast 32K 16-bit RAM
With Fast 16bit RAM and 3.58MHz crystal speed
As you can see in the above table there is a remarkable speed difference between the different settings. With the
32K 16-bit RAM and the faster crystal you can have a console that runs at twice the speed of the original.