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Re: Amstrad Mega PC

well.... it's not a *huge* performance upgrade I am sure - but it's a "because we can" upgrade LOL atm I have the patch wire like this: https://i.imgur.com/dPC3592l.png and I think I'll do it like this: pass it under the fpu socket and solder on the kbc pin from the top side - it's not like you mess …

Re: Amstrad Mega PC

To me, that photo shows pin 30 (FLUSH#) cut off to make room for the wire to be connected to pin 31 (A20M#). The other photos showed the opposite end of the wire connected to pin 22 on the 8042 which is the A20 gate, so it makes sense that it goes to A20M#. The bodge wire exists because this is a …

Re: Amstrad Mega PC

I thought we figured that out? It connects Pin 22 (data output bit 1 / A20 gate control) on the 8042 keyboard controller to A20M# on the CPU. The CPU needs to know what state the A20 gate has so it can know if bit 20 of an address should be ignored or respected when looking up data in its internal …

Re: CleanWave32 distortion fix

thanks for sharing this info Tiido - yes it is strange this went unfixed..! then again Dream is known to *forget* many things including cool things they did in the past so it doesn't surprise me... this issue could be right when the company is sold and staff moved around anyways, a late fix is …

Re: Amstrad Mega PC

@phipscube thanks for the feedback! but to be clear CMS supports is as good as gone... so in the card there will be an OPL3 and the user will chose either to mod the sega card and use OPL3 full time or do not mod the sega card and opl2 will work along with opl3 (in this case opl3 will only "answer" …

Re: Amstrad Mega PC

Well thanks for the inputs - really appreciated and it led to more thinking: First of all CMS support needs to be removed completely . It will never be fully gameblaster compatible anyways and it just stands in the way of a simpler design. It is just a cool thing to try for some games but other than …

Re: How about a MR-BIOS ROM file repository?

I have a about 6 or 7 motherboards (386) with MR BIOS ROM's... have been meaning to dump / back them up. I recall there may be a way to do it in DOS without requiring a EPROM programmer, it that right? programmer is the best to use, software methods are not 100% you will get some data but it would …

Re: Amstrad Mega PC

@phipscube well I got 2x 33mhz cpus but they are the 3.3v variants... should be 5v tolerant but I am not risking it Zalog sent me a good 5v part the -25 MAB one which is the same Asmtrad used at some point soon-ish when things calm down in my life I will attempt the upgrade and report back! (most …

Re: "Fake Sound Chips"...? Particularly Yamaha.

this is what I think happens - there are scams with fake chips , people have bought them - installed them - watched them catch fire ... these are scams so they can sell a 1cent chip for 2eur - there are scams where you get a rebadged clone chip - there are scams where you get rebadged chips that are …

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