Скачать с ютуб Dragon 32 Upper RAM (Memory) Repair MkII Boards в хорошем качестве

Dragon 32 Upper RAM (Memory) Repair MkII Boards

The video helps you diagnose and locate faulty 4116 chips in the upper 16K of RAM on Dragon 32 MKII boards. *DISCLAIMER* If any doubt take your Dragon to a professional! It is very easy to destroy your Dragon with poor soldering etc. Video Notes: ========== The example in the video shows where a chip has a completely failed, in some instances it could just be a single bit, in a single byte, which is more difficult to locate but below is a BASIC program that can be used to help find the faulty memory location. BASIC RAM testing program download, also checks 12K of the lower RAM. http://www.dragondata.co.uk/tech/YT-U... **Before** loading or typing in the memory testing program enter the following into BASIC: PCLEAR 1 CLEAR 100,3999 Once the faulty memory location has been identified use the POKE and PEEK method shown in the video to find the faulty bit/chip but using the memory location identified as faulty. N.B: Lower 16K : 0 – 16383 Upper 16K : 16384 - 32767 www.dragondata.co.uk The Dragon Data Archive Thanks to Phill for QC