>From: Tim Stark [mailto:[email protected]] >Sent: Sunday, 9 April 2017 10:39 >To: 'Cory Smelosky' >Cc: [email protected]; [email protected] >Subject: RE: [Simh] DEC VT emulators on MAME > >Ok, I checked VT340 schematics. Ok, I need two ROM dumps: > >512Kx8 2804 EPROM on E80 (firmware code) >32Kx8 27256 UVEPROM on E49 (character generator) > >Yes, All VT300 series uses 8031 processor with DC7051 video controller and >2681 DUART interface. > >Thanks, >Tim
I've now pulled apart a spare non-working VT340, for the ROM dumps. This terminal has a faulty power supply and very significant screen burn, so I wasn't planning on repairing it anyway. On my board, E80 is a XICOR X2804AP-45 which is soldered in place. So I haven't removed it or dumped its contents. E49 is a 27256 EPROM. I have dumped the content of that ROM and it is now available here -> http://avitech.com.au/?p=1818 That page also has pictures of the VT340 internals. Tim - I will write to you separately to arrange sending the VT340 logic board to you. Malcolm. _______________________________________________ Simh mailing list [email protected] http://mailman.trailing-edge.com/mailman/listinfo/simh
