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![When I though my IBM PC (5150) was 128K short of 640K RAM, I designed and built this prototype 128K RAM expansion using parallel RAM and implemented parity checking! : r/retrobattlestations When I though my IBM PC (5150) was 128K short of 640K RAM, I designed and built this prototype 128K RAM expansion using parallel RAM and implemented parity checking! : r/retrobattlestations](https://i.redd.it/when-i-though-my-ibm-pc-5150-was-128k-short-of-640k-ram-i-v0-kgf5kwfroyu81.jpg?width=4032&format=pjpg&auto=webp&s=d9d208bd4db19aac09eb6313793a079acdbf2614)
When I though my IBM PC (5150) was 128K short of 640K RAM, I designed and built this prototype 128K RAM expansion using parallel RAM and implemented parity checking! : r/retrobattlestations
![When I though my IBM PC (5150) was 128K short of 640K RAM, I designed and built this prototype 128K RAM expansion using parallel RAM and implemented parity checking! : r/retrobattlestations When I though my IBM PC (5150) was 128K short of 640K RAM, I designed and built this prototype 128K RAM expansion using parallel RAM and implemented parity checking! : r/retrobattlestations](https://i.redd.it/when-i-though-my-ibm-pc-5150-was-128k-short-of-640k-ram-i-v0-noa12xfroyu81.jpg?width=4032&format=pjpg&auto=webp&s=189c3dcd165f4d5773274489f81515e9f9353a4f)