Sinclair ZX Spectrum ROM add-ons

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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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Authored by J.G.Harston - Last update: 10-Mar-2016