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So you have your lovely shiny new expansion device or gadget 8-) Your Memotech works great, but over time the PCB of your expansion device starts collecting dirt, dust and hairs and all of a sudden does not look so good :( So how do you protect it? :?: :idea: Well you may want to fit it in a nice pl...

Memotech MTX ROM & EPROM pin-outs As information on Mask ROM and PROM chips is hard to find, and as there are a number of different pin-outs for different EPROM chips, I thought I would provide some of the much needed information. I have attached a zip file containing spreadsheet files (in OpenO...

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Basic repair and hardware information Knowing your chips The type of chips or integrated circuits (ICs) used in a MTX are in packages known as DIL. This means Dual In Line. DIL chips come in many different sizes depending on how many pins are present. They come in two widths - 0.3 inch and 0.6 inch...

Hello TC and Welcome to our Memotech forum

Mark

Dave wrote:Nice description of the fault finding process, can I pinch a copy for the website

Yes, not a problem
Mark

Part 2... Disable DRAM test lead 3.JPG Disable DRAM test lead 4.JPG So I attached my “shorting strap”, connected the MTX to a display and powered up – with the on board DRAM disabled I had exactly the same symptoms as before (as expected). I powered down. Plugged the correct GAL (for zero on-board ...