First post, by vetz
- Rank
- l33t
I have an Olivetti M28 machine with the original monitor. It has a 286 running at 8mhz, 1mb RAM on the mainboard + 1,5mb on an ISA memory board, Soundblaster 2.0, a MIDI card, 3com ethernet card and the original 20mb MFM drive.
I really like the machine and I recently got hold of a fully boxed STB Multi Res EGA card. This card has stated support for 25khz and 400 line monitor.
In the manual (which I'll scan and upload to archive and TRW) it states full 16 color EGA 640x350 support for 25khz monitors from Olivetti and AT&T with an optional adapter cable. There is no additional info on how this cable is setup/built/pinouts. The card also includes a Windows 1.0/2.0 driver which makes Windows run in full 400 line mode with 16 colors on a 25khz monitor.
So I'm asking here. I've done a search and I haven't found a single person who has actually built a 9-pin to 25pin adapter to use on a supported EGA card. The closest is this thread: Olivetti monitor pinout (DB25 -> DB9)
The pinout for the monitor is as follows according to an old USENET post:
Pin number Signal
1 HSYNC
2 ID 0
3 VSYNC
4 R (D1)
5 G (D2)
6 B (D0)
7 HIGHLIGHT
8 -
9 -
10 ID 1
11 MODE 0
12 MODE 1
13 -DEGAUSS
14 GND
15 GND
16 GND
17 GND
18 GND
19 GND
20 GND
21 GND
22 PCLK
23 BLANKING
24 +15 V
25 +15 V
EGA has the following:
1 GND Ground
2 SR Secondary Red
3 PR Primary Red
4 PG Primary Green
5 PB Primary Blue
6 SG/I Secondary Green / Intensity
7 SB Secondary Blue
8 H Horizontal Sync
9 V Vertical Sync
GND, H, V and the primary RGB is easy identified, but is HIGHLIGHT (pin 7) on the Olivetti pin 6 on EGA? What about PIN 2 and PIN 7 for Secondary Red/Blue?
