From 46871b9ef53ec4156dfa8a42f53f6e00bcc962e3 Mon Sep 17 00:00:00 2001 From: Thomas Quinot Date: Sun, 23 Mar 2025 16:28:20 +0100 Subject: [PATCH] Add voltages at CPU pins --- _source/_posts/2025-03-23-ti99-4a-restoration.md | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/_source/_posts/2025-03-23-ti99-4a-restoration.md b/_source/_posts/2025-03-23-ti99-4a-restoration.md index 8b1dad8..6a0b61c 100644 --- a/_source/_posts/2025-03-23-ti99-4a-restoration.md +++ b/_source/_posts/2025-03-23-ti99-4a-restoration.md @@ -61,6 +61,10 @@ The PSU board shows no obvious sign of damage, either. * the voltages provided by the mains transformer look good * the DC voltages at the output of the power supply board look good +* voltage readings at CPU pins: + * pin 1 (Vbb) -4.88 to -4.64V + * pin 2 (Vcc) +4.8 to +5.2V + * pin 27 (Vdd) +11.4 to +11.9V ### Clock signaks