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ZX Spectrum 16K/48K edge connector: Difference between revisions
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→IO Request Signals: Which peripherals?
m (ZX Printer is a proper name) |
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This combined !IORQ+A0 signal is connected to Lower Pin 13 and is referred to as !IORQULA or sometimes !IORQGE. | This combined !IORQ+A0 signal is connected to Lower Pin 13 and is referred to as !IORQULA or sometimes !IORQGE. | ||
Some peripherals use this as an input to inhibit the ULA !IOREQ even when A0 is low thereby allowing the use of even numbered ports. | Some peripherals<sup>[Which?]</sup> use this as an input to inhibit the ULA !IOREQ even when A0 is low thereby allowing the use of even numbered ports. | ||
====Key Slot==== | ====Key Slot==== | ||