DesTEST Switch v2 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 Switch v2 Features Gold Plated Contacts ENIG PCB Reset Button w/LED's Max Mode Operation and Full 64k Mode Operation March-B Ram Testing Algorithm No Dependence on the ROM's, CIA's or SID ROM checksum verification (if installed) CIA TOD consistency verification From factorofmatt...... DesTest MAX-Switch The MAX-mode of the C64 expansion-port is truly a marvel since it allows the program on the cartridge to run right from the get-go bypassing the kernal and its assumptions about working memory. This convenience, however, comes at a cost: All but the bottom 4K of memory plus the kernal, BASIC and character ROMs are not available. That's why DesTestMAX only tests 4K! That's all it can test. The DesTest MAX-Switch (or just the 'Switch) solution aims to fix this limitation! The custom DesTest MAX-Switch cartridge adds the capability to switch (hence the name) between the MAX-mode and regular cartridge-mode under program control. The new DesTest Software allows the following features: Full 64K memory test using the March-B algorithm. No dependence on the ROMs, CIAs or SID: they can be removed. ROM checksum verification (if installed). CIA TOD consistency verification. The DesTest MAX-Switch hardware includes provisions for the following: Power LED. Most of the time when diagnosing or repairing a C64, the keyboard is removed along with the Power LED. The DesTest MAX-Switch cartridge includes a simple power LED to avoid mistakes like removing or inserting ICs with the power on. Reset Switch and LED. A faulty reset-circuit in a C64 can prevent it starting-up properly. A reset-switch can temporarily bypass a faulty reset-circuit and the LED gives a visual indication if something is wrong! Dimensions: 58 x 49 x 11.33mm Weight: ~22.5grams Color: Black Guaranteed tested and working when Shipped to you. Sold From USA, PHOENIX AZ Any Questions, do not hesitate to ASK. Check out the switch in action ....