From d45daa893f35c546741aefb67899ae446d715626 Mon Sep 17 00:00:00 2001 From: Tom Nisbet Date: Mon, 16 Sep 2024 09:39:46 -0400 Subject: [PATCH] Update design-350-tommyprom32-pcb.md Typo in M27C256 description --- docs/_docs/design-350-tommyprom32-pcb.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/_docs/design-350-tommyprom32-pcb.md b/docs/_docs/design-350-tommyprom32-pcb.md index e18bbcb..cc93a76 100644 --- a/docs/_docs/design-350-tommyprom32-pcb.md +++ b/docs/_docs/design-350-tommyprom32-pcb.md @@ -42,7 +42,7 @@ Note the the top picture showed the version 1.0 board and a jumper wire was need ### M27C256 -The M27C256 chip needs two voltages for programming. The external power supply is providing 12.75V to _VPP Out 1_ for the the chip's _Vpp_ and _A9_ pins. The power supply is also providing 6.25V to _VPP Out 2_ for the chips _Vcc_. Note the the chip's _Vcc_ is no longer connected to the system +5V. The two _VPP Select_ switches should be in the _low_ position for normal read operation and in the _high_ position for programming. +The M27C256 chip needs two voltages for programming. The external power supply is providing 12.75V to _VPP Out 1_ for the the chip's _Vpp_ pin. The power supply is also providing 6.25V to _VPP Out 2_ for the chips _Vcc_ pin. Note the the chip's _Vcc_ is no longer connected to the system +5V. The two _VPP Select_ switches should be in the _low_ position for normal read operation and in the _high_ position for programming. [![TommyPROM32 M27C256 programming](images/TommyPROM32-27C256-500.jpg)](images/TommyPROM32-27C256.jpg)