UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Timbucus · 6th Jun 2020, 1:10 am

... and yes I agree on the mapping solution - mostly. I had been toying with using your Opto isolator trick to allow the TopPage to be mapped to any of the four lines...

All this comes with risks which is why it is better I experience them not you - but, for safety I think a direct connect is probably not a good idea - after all software when it goes wrong can write all sorts of junk. We do not want to create our own HCF instruction (Half and Catch Fire) that literally does what a POKE was rumoured to do on early PETS (set a chip free running near a flammable material...).

6th Jun 2020, 1:10 am	#58
Timbucus Octode Join Date: Mar 2019 Location: Barry, Vale of Glamorgan, Wales, UK. Posts: 1,364	Re: Mk14 vdu ... and yes I agree on the mapping solution - mostly. I had been toying with using your Opto isolator trick to allow the TopPage to be mapped to any of the four lines... All this comes with risks which is why it is better I experience them not you - but, for safety I think a direct connect is probably not a good idea - after all software when it goes wrong can write all sorts of junk. We do not want to create our own HCF instruction (Half and Catch Fire) that literally does what a POKE was rumoured to do on early PETS (set a chip free running near a flammable material...).