Leaderboard

Came across a couple of boards recently with Memory protect boards on them. Not seen these before so I thought I'd draw up a diagram for them. It uses the same monitor chip as in MPS2, PCF1251 which is obsolete and unobtainable. All it does it uses the chip to monitor the VRAM voltage and then operate a solid state switch to break the RAM connection on pin 21 (WR).

Hi I've recently purchased a fully working jpm plus money it's a great machine in very good condition but it just needs a couple of bits the chrome work needs restoring which is not a problem what I really need is a set of reel bands the ones currently fitted are un damaged but very yellow from the years of fluorescent tube lighting does any one have a decent set of reel bands or can re-produce a set for me I will pay for them either way it will just set the machine off once the chrome work is restored 😊 Thank you

It’s for this pile of shit I picked up recently 😎

Hope to have this finished by next week thanks to gary and louie bee for the roms it's a cracking little game , especially as it is 20p/£6 jackpot was there many sru's on this jackpot, as i have never seen any.