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lyonadmiral
January 23rd, 2016, 06:20 PM
I'm trying to identify this card. I've searched on Bing and Google with no luck. :confused: The only marks on the card as seen in the pictures are on the component side TophAT stylized as so and on the backside PN4035 MADE IN USA.

Any ideas?

Thanks,
D

2922829229

modem7
January 23rd, 2016, 06:34 PM
Boca Research produced a 128 KB RAM card known as the "tophat". Designed for the IBM AT (and clones), providing RAM from address 512 KB (maximum that can be fitted on the motherboard) to 640 KB.

Chuck(G)
January 23rd, 2016, 09:13 PM
That certainly looks like it--I think I see 4 DRAM chips in the middel and a delay line (RAS/CAS) near the bracket.

It does strike one a bit silly, taking up a whole slot for just 128KB, though.

lutiana
January 23rd, 2016, 10:39 PM
You need a better camera man, I am amazed that the guys above could id the thing from those fuzzy images.

lyonadmiral
January 24th, 2016, 04:48 AM
You need a better camera man, I am amazed that the guys above could id the thing from those fuzzy images.

It's an iPhone 5, I just have very poor lighting in my apartment at night. I could have waited until this morning and should have...

lyonadmiral
January 24th, 2016, 04:50 AM
That certainly looks like it--I think I see 4 DRAM chips in the middel and a delay line (RAS/CAS) near the bracket.

It does strike one a bit silly, taking up a whole slot for just 128KB, though.

Thanks. That makes sense about the purpose of the card because I was like, it has no jumpers or DIP switches on it, if it's memory exactly how much and for what.

lyonadmiral
January 24th, 2016, 04:51 AM
Boca Research produced a 128 KB RAM card known as the "tophat". Designed for the IBM AT (and clones), providing RAM from address 512 KB (maximum that can be fitted on the motherboard) to 640 KB.

Don't you find it funny however that a late model XT could have a motherboard packed with 640K but the flagship AT has only 512?

bobba84
January 24th, 2016, 01:26 PM
Don't you find it funny however that a late model XT could have a motherboard packed with 640K but the flagship AT has only 512?

Haha yeah! Don't forget though that the AT came out almost three years before the XT ceased production. Although - the max on board was always only 512K on the AT!

modem7
January 24th, 2016, 08:32 PM
;) IBM executive quote: "512K ought to be enough for anybody."