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ZX Spectrum edge connector: Difference between revisions

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{{Template:Spectrum edge connector|A15|A13|D7|[[#ROM disable pins|{{overline|OE}}]]|SLOT|D0|D1|D2|D6|D5|D3|D4|{{overline|INT}}|{{overline|NMI}}|{{overline|HALT}}|{{overline|MREQ}}|{{overline|IORQ}}|{{overline|RD}}|{{overline|WR}}|NC|{{overline|WAIT}}|+12v|NC|{{overline|M1}}|{{overline|RFSH}}|A8|A10|NC|A14|A12|+5v|NC|SLOT|0v|0v|{{overline|CK}}|A0|A1|A2|A3|NC|0v|[[#ROM disable pins|{{overline|OE}}]]|NC|NC|NC|{{overline|BUSRQ}}|{{overline|RESET}}|A7|A6|A5|A4|[[#ROM disable pins|{{overline|ROMCS}}]]|{{overline|BUSACK}}|A9|A11}}
{{Template:Spectrum edge connector|A15|A13|D7|[[#ROM disable pins|{{overline|OE}}]]|SLOT|D0|D1|D2|D6|D5|D3|D4|{{overline|INT}}|{{overline|NMI}}|{{overline|HALT}}|{{overline|MREQ}}|{{overline|IORQ}}|{{overline|RD}}|{{overline|WR}}|NC|{{overline|WAIT}}|+12v|NC|{{overline|M1}}|{{overline|RFSH}}|A8|A10|NC|A14|A12|+5v|NC|SLOT|0v|0v|[[#CPU_Clock|{{overline|CK}}]]|A0|A1|A2|A3|NC|0v|[[#ROM disable pins|{{overline|OE}}]]|NC|NC|NC|{{overline|BUSRQ}}|{{overline|RESET}}|A7|A6|A5|A4|[[#ROM disable pins|{{overline|ROMCS}}]]|{{overline|BUSACK}}|A9|A11}}


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This means that when designing an interface which will page external memory in place of the Spectrum ROM a configuration jumper or similar is required to connect the ROM disable signal to lower pin 15 on a +3, but disconnect it on a 16/48k.
This means that when designing an interface which will page external memory in place of the Spectrum ROM a configuration jumper or similar is required to connect the ROM disable signal to lower pin 15 on a +3, but disconnect it on a 16/48k.
Applying ROM paging signals to the 16/48k composite out pin does no permanent damage, but causes burst of patterning on the display.
Applying ROM paging signals to the 16/48k composite out pin does no permanent damage, but causes burst of patterning on the display.
====CPU Clock====
Note that the {{overline|CK}} signal was accidentally left unconnected on the Spanish version of the 128k+.


[[Category:Edge connectors]]
[[Category:Edge connectors]]
[[Category:Hardware]]
[[Category:Hardware]]
[[Category:Spectrum]]
[[Category:Spectrum]]