Re: Need help with an Accellerator IIe Card

[Patrick Schaefer <PSchaefer@lycosxxl.de>]

KPR schrieb:

> Anyone know which 74LS chips were more suseptable to static..

74LS are not susceptible to static at all. They are bipolar, not CMOS. 
The new 74HC and HCT series are, but as they are new, they are pretty 
safe. You can use 74HCT as a replacement for 74LS, when you want to 
reduce the power consumption (and heat generation) by 50..70%.

>                        8 - 4264 ( ram )
>                        2 - 4416 ( ram )

The old DRAMs are NMOS, sometime CMOS. These may be damaged by ESD.

>                        1 - 6309-1J -- not shure what this is

A bipolar prom. IIRC 256 byte x 8 bit. Bipolar, not CMOS.

>                        2 - 65C02 ( Well on and probably a 3.5 mhz model
> under a sticker )

CMOS, as the name says. But it's easy to test the CPU -- just plug it 
into the mainboard.

And you forgot the biggest bug on the board: the 40pin gate array 
located below the CPU. This is a CMOS part, and it is very unlikely to 
get a replacement for this!

The old Accelerator II (without "e") used only discrete logic, perhaps 
someone can derive the function of the gate array from this.


Patrick