Bill.Frandsen@samba.acs.unc.edu (BBS Account) (08/15/90)
Is there a special cable available to connect the Amiga to a TTL monochrome monitor? (specifically, one with a 640x800 resolution?) Has anyone accomplished this? If so, how well does it work (i.e. are the characters as readable as they are on a 1950 in the same mode?, How about interlace flicker?) Now, I'm not referring to the mono video output jack on the back of the A500/2000/3000 series that is composite, meant for a luminance/composite input on a VCR/TV. It would have to be off certain pins on the video port, all I need is a good clean B+W display. Which pins are used? I can build a cable quickly also. At this time, I do not know the scanning frequency of the monitor, but it appears to be compatible with an IBM graphics card. Any help appreciated. E-Mail address: Bill.Frandsen@bbs.acs.unc.edu
soh@pegasus.trl.oz.au (kam hung soh) (08/16/90)
I'd connected my old A1000 to a CGA-type TTL monitor. The picture was refreshingly sharp in 640 x 256 (I had a PAL A1000) and almost usable in interlace mode. Them old monitors have long persistence phosphor screens! Unfortunately, the monitor did not display all colours (due to the digital input). To do this, I had to invert the signals of the digital Red, Green and Blue outputs from the A1000 with a NOT chip. Buy a chip prototype board & a chip socket if you don't want to burn the chip with your soldering iron. --- Soh, Kam Hung email: h.soh@trl.oz.au tel: +61 03 541 6403 Telecom Research Laboratories, P.O. Box 249, Clayton, Victoria 3168, Australia
soh@shiva.trl.oz (kam hung soh) (08/17/90)
soh@pegasus.trl.oz.au (kam hung soh) writes: >I'd connected my old A1000 to a CGA-type TTL monitor. The picture was >refreshingly >sharp in 640 x 256 (I had a PAL A1000) and almost usable in interlace >mode. Them old >monitors have long persistence phosphor screens! Unfortunately, the >monitor did not >display all colours (due to the digital input). >To do this, I had to invert the signals of the digital Red, Green and ^^^ ^^^^^ >Blue outputs ^^^^ AAARGH! I meant Hsync* and Vsync* outputs! This should teach me not to write late in the evening! Soh, Kam Hung email: h.soh@trl.oz.au tel: +61 03 541 6403 Telecom Research Laboratories, P.O. Box 249, Clayton, Victoria 3168, Australia
trefz@ohstpy.mps.ohio-state.edu (08/17/90)
In article <816@beguine.UUCP>, Bill.Frandsen@samba.acs.unc.edu (BBS Account) writes: > Is there a special cable available to connect the Amiga to a TTL monochrome > monitor? (specifically, one with a 640x800 resolution?) > > Has anyone accomplished this? If so, how well does it work (i.e. are the > characters as readable as they are on a 1950 in the same mode?, How about > interlace flicker?) > > Now, I'm not referring to the mono video output jack on the back of the > A500/2000/3000 series that is composite, meant for a luminance/composite > input on a VCR/TV. > > It would have to be off certain pins on the video port, all I need is a good > clean B+W display. Which pins are used? I can build a cable quickly also. > > At this time, I do not know the scanning frequency of the monitor, but it > appears to be compatible with an IBM graphics card. > > Any help appreciated. E-Mail address: Bill.Frandsen@bbs.acs.unc.edu We have connected an Amiga 1000 to a RCA TTL monitor and it worked just fine. The highest mode was 640 by 400. This monitor was basicly an EGA monitor. The cables can if you only want to use the TTL monitor, if you want to use your Amiga monitor it is more complicated. Find the pin outs in the manual for the video port. You will need a 23DB connector, 75 ohm cable and either BNC or RCA connector to the monitor. Connect the 75 ohm calbe to the digital red, green, blue and composite out. These four are needed for the monitor. You might also need a box or cover to house the connection depending on the number and physical restraints. I hope this helps. Kelvin Trefz Ohio State University