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Retrocomputing

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  • Doesn't the superfo harlequin only support the 128k memory mapping though? The +3 had a new memory mapping setting just to support CP/M worldofspectrum.org/faq/reference/128kreference.htm Commented Dec 19, 2018 at 22:58
  • @PaulHumphreys The Harlequin 128 with superfoo mods runs the +3 ROM, so I would expect it uses the same (all-RAM) memory layout. Commented Dec 19, 2018 at 23:02
  • The zip file containing the 128K mods shows it running the 128k ROM and not the +3 one and the screenshots only show the 128k mode being tested and not the all RAM mode unique to the +3 and some +2s. In addition, the .txt file in the superfo docs says "For 128K, signal 1FFD is not used.". Port 0x1FFD is needed to switch to all RAM mode. I do notice the superfo design uses 2 128k ram chips. Does the superfo have some other means of switching to all ram perhaps? Commented Dec 19, 2018 at 23:17
  • Mine runs the +3 ROM. I have a Chinese re-make (ZX Omni). On second thought, I am, however, not 100% sure if the +3 ROM ever switches into all-RAM mode. Commented Dec 19, 2018 at 23:19
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    If you have a 128k harlequin, would you be able to test whether the all ram mode is accessible somehow and report back? Commented Dec 19, 2018 at 23:41