was: National Semi... is Apple ][ collectability (if any)
spacewar at gmail.com
Wed Jan 4 05:46:50 CST 2017
On Tue, Jan 3, 2017 at 9:03 PM, drlegendre . <drlegendre at gmail.com> wrote:
> Add some RAM, maybe a DISC-II card and those things overheated even +with+
> the vents.. that's why the Cider fan became popular, among other things.
My Apple II+ had no fan, but never overheated. I heard a lot of people talk
about needing a fan, but had no idea why.
For much of its life my Apple II+ contained:
0: language card (16KB DRAM)
1: parallel printer card
2: super serial card
3: Videx 80-column card
4: Microsoft Z-80 softcard
5: homemade HP-IL interface card using HP 1LB3 chip
6: Disk II controller
7: Sorrento Valley 8-inch floppy disk controller
and a Videx Keyboard Enhancer II (6502-based replacement for the Apple
keyboard encoder, to add lower case, macros, etc.)
The only times I had any unreliability were when one DRAM chip went bad,
and when the firmware EPROM (2708) on the Videx card went bad.
At other points in time it contained
* Corvus hard disk interface
* Apple Profile hard disk interface
* Video Associate Labs VB3 microkeyer (large board in slot 7, cabled to an
even larger board over the power supply)
If anything was going to make it overheat, I would have bet on the VB3.
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