At the trial of an inmate of a penal institution for the crime of mutiny, any other inmate not included in the same indictment shall be a competent witness, and the infamy of his character and of the crime of which he has been convicted shall be exceptions to his credit only. History. — Laws 1833, Cobb’s 1851 Digest, p. 840; Code 1863, § 4563; Code 1868, § 4583; Code 1873, § 4677; Code 1882, § 4677; Penal Code 1895, § 331; Penal Code 1910, § 336; Code 1933, § 26-4803; Code 1933, § 26-9903, enacted by Ga. L. 1968, p. 1249, § 1.