16kb variant of the IBM 5150

My 16K/64K 5150 has an IBM ISA RAM card in it that held 64K, and a Monte Carlo RAM + Serial card that topped the unit out at 448K. They all have the large wide black brackets so they are very early PC cards. -----Original Message----- From: Michael Holley Sent: Wednesday, July 31, 2013 4:18 PM To: 'General Discussion: On-Topic and Off-Topic Posts' Subject: RE: 16kb variant of the IBM 5150 The original IBM 5150 had 4 rows of 16K DRAM for 64K max on the motherboard. When the XT was released the PC was upgraded to 4 rows of 64K DAM for 256K max. I bought my IBM 5150 in March 1983. (Just before the XT came out.) The complete system (computer, floppies, monitor and printer) was $3600 and my employer reimbursed $1200. There were many third party cards available. The AST Six Pak IO/ RAM board held 384K of RAM, the old PC would then have 448K and the new PC/XT would have the magic 640K. Michael Holley