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| Does anyone recognise this logo? DD? |
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| GlennSprigg:
--- Quote from: fcb on December 04, 2020, 12:51:31 pm ---Double D Electronics Ltd, UK http://www.ddelec.co.uk/ --- End quote --- Kudos to you!!!! :-+ |
| TomS_:
--- Quote from: fcb on December 04, 2020, 12:51:31 pm ---Double D Electronics Ltd, UK http://www.ddelec.co.uk/ --- End quote --- Smashed it right out of the park! ^-^ "Sadly" it looks like they may have moved on from these products, they mostly seem to be involved in RF from what their website lists these days. I might just try sending them an email and see if they would happen to have any old datasheets laying around, never know! |
| TomS_:
Yeah, I managed to figure out one of the PALs just by toggling inputs and using my Z80 knowledge to make some educated assumptions about which pins should be which. They are pretty simple boards really. Z80 PIOs and Intel 8255's and a sprinkling of other logic. Got to start somewhere I suppose. Still would be nice to see how close I got - or how far off I am. :-) |
| CJay:
--- Quote from: fcb on December 04, 2020, 12:51:31 pm ---Double D Electronics Ltd, UK http://www.ddelec.co.uk/ --- End quote --- Brilliant and really impressed they're still in business too. Now I need to know if they've got schematics available :) |
| CJay:
--- Quote from: TomS_ on December 04, 2020, 01:52:19 pm ---Yeah, I managed to figure out one of the PALs just by toggling inputs and using my Z80 knowledge to make some educated assumptions about which pins should be which. They are pretty simple boards really. Z80 PIOs and Intel 8255's and a sprinkling of other logic. Got to start somewhere I suppose. Still would be nice to see how close I got - or how far off I am. :-) --- End quote --- Yeah, that's the fun of it, I bought a pile of LED signboards a few years ago just to break for parts and found every one of them had a 6502 based controller inside, had loads of fun reverse engineering the GAL chips and disassembling the ROM contents. Really must dig out that info and post it somewhere. |
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