darren@bacchus (Darren Friedlein) (05/07/88)
While looking for a solution to my motherboard question, I ran accross This old article... +------- Subject: Re: upgrading mother board memory. Date: 5 Dec 87 04:41:33 GMT Sender: news@rtech.UUCP Organization: Relational Technology, Inc. Alameda, CA A 7300 mother board can supposedly be changed to 2M as follows. I haven't tried it and don't know if this is totally correct, but it is very similar to the 512k card upgrade. Anyone who actually does this should post to these groups with a report. I do not recommend this to someone as a first experience with a soldering iron. 1. Change all the 64k dram chips 2. Change JR1 to be from E1 to E2. You must break the board trace on the back from E2 to E3. 3. Add a 74F258 chip to location 12B. Here is a crude picture: +------------------------------------------------ | A B C | +-------+ |13 | | | +-------+ | cut E2-E3 trace |12 /E3 +-------+ | \E2 \ |74F258 | add this chip | E1 / add jumper +-------+ | | slide switch | thataway toroidal coil--\ | | thataway \ | V V Have fun! -dB "I don't care what you say, as long as you spell my name right." {amdahl, cbosgd, mtxinu, ptsfa, sun}!rtech!daveb daveb@rtech.uucp +------ And for blanking the screen, this article might make a good starting point... +------ From: ken@maxepr.UUCP (Ken Brassler) Subject: Re: cursor & video monitor help Date: 13 Nov 87 18:00:56 GMT Organization: Brassler Engineering Co., Mill Valley, CA Lines: 21 In article <3632@islenet.UUCP> richard@islenet.UUCP (Richard Foulk) writes: > >I'd really like to get a larger monitor ... >please post the pinouts for the... >8-pin connector... >in the computer. My diagrams show a 10-pin connector in the computer. If you can resolve this difference, these are the pinouts. Pin(s) Function 1 video vertical synch 2,4,6,8,10 ground 3 video horizontal synch 5 video out 7,9 +12v -- Ken Brassler {ihnp4|qantel|pyramid|lll-crg}!ptsfa!maxepr!ken ....ethos!gladys!ptsfa!maxepr!ken +------ NOTE: It could be possible that 9 and 10 were left off because of a lack of need for second +v and comm, but that's just an idea. Let me know if anyone gets anywhere with either of these projects. -darren ____ / \ | Rt 4, Box 416, Durham, NC 27703 _____|_____ Darren G. Friedlein data (bacchus) : 919/596-7746 / | \ voice : 919/596-9492 ( | ) \____/ __/ {mcnc|icus|ethos|gladys|bakerst}!bacchus!darren