* [https://www.cpu-world.com/CPUs/80387/Intel-N80387SX-20.html Intel N80387SX-20 Maths Coprocessor] has been installed and working correctly
* [https://www.ardent-tool.com/SCSI/MCS.html#MCS-600_700 IBM Fast SCSI-2 Adapter/A]
* [https://ardent-tool.com/memory/IBM_Expansion.html#1_8MB IBM Expanded Memory Adapter 0-8MB XMA] - increased to a total of [https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgs6Ma1HqCaiBmbO4jBVfpthjiYQo4E4r4jTAzBnIHgfTNIxWzZ7xFgzHsw4HGnMkmdxHTIwMvP6FLAs68soVpmw3jMaUVLG7jytZVOhnTNORFtT5jYv2Zty09BdwhqJ7EvWBPiRRELUGyc7NzIyRwexUyepov9rQJek3R3RVIJIP0X9aD02yUNLg4THw/s3968/IMG_20210731_151417.jpg 6,144 KB (6MB)] RAM from IBM Expanded Memory: 2MB using [https://www.ebay.co.uk/sch/i.html?_from=R40&_nkw=256KB+30-pin+SIMMs+150ns+&_sacat=0&LH_PrefLoc=2&_sop=15 8 x 256KB 30-pin SIMMs 150ns] ([https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=OKI+MSC2304-15YS9A&_sacat=0&LH_TitleDesc=0&_odkw=256KB+30-pin+SIMMs+150ns+&_osacat=0&_sop=15&LH_PrefLoc=2 OKI MSC2304-15YS9A]) * 2MB onboard + 2MB onboard
* [https://www.ardent-tool.com/NIC/3c523.html#Late_3C523 3COM 3C523 ETHERLINK/MC ETHERNET MCA MICRO CHANNEL ADAPTER MCA-II Network card] - [https://www.ardent-tool.com/NIC/3c523c_Photo_Front.jpg newer revision (Late version)]
* Maxell ER6K Lithium 3.6V Battery replaced with [https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313&_nkw=ACORN+BBC+MASTER+128+NEW+REPLACEMENT+LITHIUM+LONG+LIFE+CMOS+RTC+BATTERY+PACK&_sacat=0 LITHIUM LONG LIFE CMOS RTC BATTERY PACK]