[img] Sinclair ZX Spectrum ROM add-ons
MDFS::Info.Comp.Spectrum.ROMs Search

Title   Paper Size Description
ROM1.gif
ROMBox1.jpg
ROMBox2.jpg
diagram
diagram
picture
picture
2912x4096 A4P
264x512 A5P
127K
79K
63K
Single socket external ROM box. Can plug in an 16K or 32K ROM. ROMs selected with OUT &FD,&nn.
b4=0 - external ROM, b4=1 - internal ROM.
b6=0 - lower 16K, b6=1 - upper 16K.
Gives:
  • &00 - external ROM lower 16K
  • &10 - internal ROM
  • &40 - external ROM upper 16K
ROM4.gif diagram 2912x4096 A5P 165K Four-socket external ROM box. Can plug in a combination of 16K and 32K ROMs. ROMs selected with OUT &FD,&nn.
b4=0 - external ROM, b4=1 - internal ROM.
b6-b7=external ROM number
Gives:
  • &00 - 16K ROM 0 or lower 16K of 32K ROM 0
  • &10 - internal ROM
  • &40 - 16K ROM 1 or upper 16K of 32K ROM 0
  • &50 - internal ROM
  • &80 - 16K ROM 2 or lower 16K of 32K ROM 2
  • &90 - internal ROM
  • &C0 - 16K ROM 3 or upper 16K of 32K ROM 2
  • &D0 - internal ROM
img440.gif  img441.gif
img447.gif  img448.gif

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