10 Mar
2001
10 Mar
'01
12:20 a.m.
On Mar 10, 12:41, Paul Williams wrote:
There are four socketed chips together, labelled E40,
E45, E52 and E56.
Does anyone have the schematics and know what these contain?
They're the VT1xx code ROMs. In a VT100, they are contain ROMs with part
numbers 23031-E2, 23032-E2, 23033-E2, and (surprise, surprise) 23034-E2.
In a VT100-WC, -WK, or -AC, they contain 23095-E2, 23096-E2, 23139-E2,
23140-E2; the -WC and -WK variants also have an extra character ROM,
23094-E2. A VT125 or VT105 should have the same as a plain VT100 except
that the 23031-E2 is replaced with a 23061-E2.
The fourth chip, E45, is labelled differently on the
two boards
Board 1. Signetics K8340 / CN7295N / 23-033E2-00 / (c) DEC 1978
Board 2. [logo S] 8015E / C48008 / 23033E2
I assume that 23033E2 is DEC's part number, but I can't find references
for either 8340 or 8015. Is this another ROM?
Yes, 23 means a mask ROM, the next three digits are the ROM code number,
and the E2 is the size (2K in this case; E3 is 4K, E4 is 8K, etc). 8340
and 8015 are probably the date of manufacture.
--
Pete Peter Turnbull
Network Manager
Dept. of Computer Science
University of York
10 Mar
10 Mar
1:18 a.m.
Pete Turnbull wrote:
On Mar 10, 12:41, Paul Williams wrote:
Thank you Pete, that was swift and comprehensive! Is this list on the
web anywhere, or do you just happen to keep schematics to hand?
Both boards have 23061-E2, 23032-E2, 23033-E2 and 23034-E2, and fifth
ROM elsewhere labelled 23018-E2 (soldered, unfortunately).
There are four socketed chips together, labelled
E40, E45, E52 and
E56. Does anyone have the schematics and know what these contain?
They're the VT1xx code ROMs. In a VT100, they are contain ROMs with
part numbers 23031-E2, 23032-E2, 23033-E2, and (surprise, surprise)
23034-E2. In a VT100-WC, -WK, or -AC, they contain 23095-E2,
23096-E2, 23139-E2, 23140-E2; the -WC and -WK variants also have
an extra character ROM, 23094-E2. A VT125 or VT105 should have
the same as a plain VT100 except that the 23031-E2 is replaced with
a 23061-E2. 
6:16 a.m.
Pete Turnbull wrote:
>
> On Mar 10, 12:41, Paul Williams wrote:
>
> > There are four socketed chips together, labelled E40, E45, E52 and
> > E56. Does anyone have the schematics and know what these contain?
>
> They're the VT1xx code ROMs. In a VT100, they are contain ROMs with
> part numbers 23031-E2, 23032-E2, 23033-E2, and (surprise, surprise)
> 23034-E2. In a VT100-WC, -WK, or -AC, they contain 23095-E2,
> 23096-E2, 23139-E2, 23140-E2; the -WC and -WK variants also have
> an extra character ROM, 23094-E2. A VT125 or VT105 should have
> the same as a plain VT100 except that the 23031-E2 is replaced with
> a 23061-E2.
And the VT132 has either 23095E2, 23096E2, 29097E2, 29098E2, OR
23180E2, 23181E2, 23183E2, 23183E2
Now you have all the information from Table 5-7, from page 5-68 of
the VT100 Series Video Terminal Technical Manual ;)
Thank you Pete, that was swift and comprehensive! Is this list on the
web anywhere, or do you just happen to keep schematics to hand?
Both boards have 23061-E2, 23032-E2, 23033-E2 and 23034-E2, and fifth
ROM elsewhere labelled 23018-E2 (soldered, unfortunately).
Hmm I dont see that one. Does it have an E-label? If so I could
probably find it on the Video Processor Block Diagram.
-Lawrence LeMay
7:08 a.m.
Lawrence LeMay wrote:
Yes, it's E4.
Cheers,
Paul
Now you have all the information from Table 5-7, from page 5-68 of
the VT100 Series Video Terminal Technical Manual ;)
Thank you!
fifth ROM
elsewhere labelled 23018-E2 (soldered, unfortunately).
Hmm I dont see that one. Does it have an E-label? If so I could
probably find it on the Video Processor Block Diagram.
9:12 a.m.
Lawrence LeMay wrote:
Yes, it's E4.
E4 and E9 are the character generator ROMs.
-Lawrence LeMay
Now you have all the information from Table 5-7, from page 5-68 of
the VT100 Series Video Terminal Technical Manual ;)
Thank you!
fifth ROM
elsewhere labelled 23018-E2 (soldered, unfortunately).
Hmm I dont see that one. Does it have an E-label? If so I could
probably find it on the Video Processor Block Diagram.
8689
days inactive
8689
days old
4 comments
3 participants
participants (3)
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celigne＠tinyworld.co.uk -
lemay＠cs.umn.edu -
pete＠dunnington.u-net.com