[Simh] DEC VT emulators on MAME

[malcolm at avitech.com.au]

>From: Tim Stark [mailto:fsword7 at verizon.net] 
>Sent: Sunday, 9 April 2017 10:39
>To: 'Cory Smelosky'
>Cc: malcolm at avitech.com.au; simh at trailing-edge.com
>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.