DesTEST MAX Commodore 64 64c c128 Ram Diagnostic Cartridge
ToTs RETRO
Commodore 64 64c c128 c128D Ram Diagnostic Cartridge
works with commodore 64 and commodore 128
DesTEST Max
Features
New Stronger Case Design
Reset Button
Color Coded For Easy Recognition
Max Mode Operation
March-B Ram Testing Algorithm
From factorofmatt......
"The DesTestMAX project aims to improve upon Commodore’s Dead Test cartridge by using a more comprehensive memory test strategy and provide easier to interpret diagnostic output.
DesTestMAX utilizes the MAX (or ULTIMAX) cartridge mode as it allows us to place code directly in the $E000-$FFFF block of memory that gets executed as soon as the system resets. Such a situation allows the DesTestMAX code to take complete control of the system right from the get-go. Unlike the regular Commodore 64 boot process, DesTestMAX makes very few assumptions about the state of the machine and can produce usable results even with a severely broken machine.
The 6510 CPU, VIC-II and PLA need to be functional, though the ROMs, CIAs and SID are not required and can be removed if socketed.
The big drawback to MAX mode is that only the first 4K of system memory is available to the CPU. DesTestMAX then can’t be a fully-comprehensive memory test, but it can be a great help when faced with a Commodore 64 that shows nothing but a black screen.
A DesTestMAX cartridge will also work in a Commodore 128. DesTestMAX will automatically run in ‘64 mode yet requires the ‘128 kernal, a working Z80 and a working MMU. The VDC is not required.
DesTestMAX utilizes the March-B memory test algorithm which can detect a wide range of memory errors including bad bits and page errors. Good care has been taken to ensure that no assumptions are made about the validity of memory before it has been tested. Neither Zero Page nor the Stack are used before those two memory regions have been verified since errors in either could cause havoc with the running code. The full 4K memory-test takes about 10 seconds and verifies all but the first 2 bytes of memory all in one go."
Dimensions: 68.8 x 54.1 x 21.1mm
Weight: ~48.5grams
Color: Teal Tool
Guaranteed tested and working when Shipped to you.
Sold From USA, PHOENIX AZ
Any Questions, do not hesitate to ASK.