coonsgm wrote: 10 Sep 2024 14:05
I'm not too concerned...not a whole lot of reason to ever use two ROM TOS. Working with 6 ROM's is what's needed.
Well actual EPROMs that work with a 2 ROM setup seem to be thin on the ground unless you build some sort of adapter, so for me and my large stock of 27C256's, 6chip is always the way forwards.
Working is working.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
Thanks for this great tutorial Jonnie.
Just wanted to add, much like coonsgm my Mega 1 would not boot until i removed the 74LS11 chip.
As soon as i desoldered it, booted straight away no problems.
I also found a service bulletin that Atari put out and they do say that it needs to be removed.
Strange that it that it worked for you left on the motherboard!
6 rom mega upgrade.jpg
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