Jo22 wrote on 2020-07-10, 17:22: Wonderful thread! Thanks a lot for all the information and the pictures, too! 🙂👍 Glad your enjoying it - the MegaPC is a great machine to work on and good fun to play on too ! Filename DSC_2381.JPG File size 669.61 KiB Views 2310 views

wait , what 7486SLC service manual you are talking about? share share share! :D Unfortunately I only have a printed out copy of the service manual DSC_2362.JPG Will have a look into scanning it, although it may take a little while to sort..... To help folk, here are a couple of quick phone snaps of …

Yes those reserved pins are for 32bit access and lead to the empty vram sockets - but they are all connected on the board so this is why it will be possible to just replace with a better cirus chip Going to 2 mb will require too much soldering but a chip replace and 1mb would be easily achievable …

ah you also researched the onboard 5420! I did some research though - it is possible in theory IMHO to replace the GD5420 to something better up to 5428 - the pins that connect to the 2nd ram bank to allow 32bit access are there - I have not checked about the MCA pins though - are they consistent …

need to read the vram story now LOL :-) Since you asked for it ! So when I brought the 7486 it had the 512KB video ram sticker on - however the seller told me that the ram had been upgraded to 1MB years ago. When I looked under the hood I found some AAA1M304P-07 chips in the sockets so that sounded …

great story and good job finding that monitor - these specific ones are known to amiga world as well I bought a nec one some months ago that is also 15k compatible but although amiga would display ok the megapc could not for whatever reason I also have 1 unit upgraded with the 486slc33 mobo - it …

******BREAKING MONITOR NEWS******* Last night I made a MAJOR discovery - an LCD screen that works on both the PC and Megadrive sides using ONLY a VGA cable and WITHOUT a scan doubler or any other modification !! Since a lack of monitor is a major reason why MegaPC's often get discarded, and as the …

So thought it was probably time to start a thread on my current little project..... The origins of this one go back a fair way so best start at the beginning. Back when I was a teen I was fascinated by the Amstrad Mega-PC they had on display at the Model shop in Gloucester, it was very cool and …

@Action Replay the CS4237 still controls YMF289 - external opl is supported by the chip so it was not an issue we are still optimizing - there is a newer test revision now :) Mark me down for one as I definitely need one for my MEGA-PC like the rig your testing it on, as Adlib music only isn't …

@Action Replay the CS4237 still controls YMF289 - external opl is supported by the chip so it was not an issue we are still optimizing - there is a newer test revision now :) Mark me down for one as I definitely need one for my MEGA-PC like the rig your testing it on, as Adlib music only isn't …