7 May
2013
7 May
'13
12:06 p.m.
On Tue, 7 May 2013, Terry Stewart wrote:
IRIC< the upgrade was a new CPU board and new keyboard. Were those parts
really more expensive than a complete machine?
>had a green phosphor CRT. Well, M3s that have
been upgraded don't I guess.
When the M4 came out, the college paid $1000 each to upgrade the M3s to M4s. They could have bought M4s for $600 and paid
$100 to have the drives
and RAM tranferred.
Drivee, ues. The floppy drives, PSUs, FDC board and RS232 board are the
same between the M3 and M4.
But not the RAM. M3s use 4116s (16K*1 RAM). An M4 can have 1 bank of
4116s (the very uncommon 16K version), 1 bacnk of 4164s (64K) or 2 banks
of 4164s (128K, you need t ofit a PAL chip in place of a jumper block for
this upgrade). So the 4116s from a M3 are no use in an M4.
-tony