8 Mar
2018
8 Mar
'18
3:42 p.m.
On Thu, 8 Mar 2018, Paul Berger via cctalk wrote:
Hmmmm I don't remember my original PC having all
the chips in sockets nor do
I recall it having 64Kb DRAMs.? I clearly recall that it had one bank of
16Kb DRAMs soldered down and sockets for three more banks of 16Kb chips.?
The only other sockets on the board where for the ROM, CPU, and math
coprocessor.? hardly a fathful reproduction.
If I remember correctly, the original PC/5150 BIOS supported a maximum of
544K; later BIOS could handle 640K.
What were the details for modifying a 64-256 5150 to 640K on the
motherboard? (It was not the same as converting 5160).
It did NOT involve unsoldering the 64K Bank0.