This study examined the impact of Computer Assisted Language Learning (CALL) on Korean TAFE (Technical and Further Education) college students in an English as a Foreign Language (EFL) reading classroom in terms of their perceptions of learning environment and their reading performance. The study compared CALL and traditional reading classes over one semester by measuring students' reading performance. A group of 74 first year English major students were divided evenly into two classes. Both groups were taught by the same teacher and covered the same topics in their weekly two-hour reading lessons. A reading comprehension test was given at the beginning and the end of the semester to measure the students' performance. A written survey was also administered at the end of the semester. Classroom observations and group interviews with students supplemented the data obtained from the surveys. Analysis of Covariance (ANCOVA) was used for the performance test to explore the differences between the two classes while statistically controlling for the pre-test (covariate). The questionnaires were analyzed by a principle component factor analysis, a repeated-measure ANOVA and a discriminant analysis whereas the interviews with students were analyzed by a content analysis. Students' performances in the pre-test and the post-test were not significantly different between the two classes. However, the students in the CALL-based English class were more positive in their perceptions of their learning environment than were those in the traditional English class. This study shows that computer technology had a positive impact on students' perceptions of their learning environment, especially in relation to learning materials and tasks, and with regard to interaction and collaboration with the tutor and other students.