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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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 Posted: Wed Oct 11, 2023 6:24 pm Post subject: CPU Shack: National Semi. White/Gold Early EPROMs |
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Here are some very nice National Semiconductor EPROMs.
These are all 1975 and earlier.
The 5203 and 5204 were National's own design, they have different pinouts and programming methods then the Intel 1702.
The 5203 is the same capacity as a 1702 but can switch from 256x8 to 512x4. It is also initially set to all HIGH, vs the 1702 all LOW. Both the 5203 and 5204 need 50V for programming, while the 1702 used 48V
SOLD OUTx National MM5203Q 256x8 or 512x4 $15
5x National Semi. MM5204Q 512x8 $10
SOLD OUTx National Semi. MM1702AQ 256x8 $13
SOLDx National Semi, MM1702AQ Large logo, tiny chip $8
SOLDx National Semi, MM1702AQ Large logo, -2 pins $4
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Last edited by CPUShack on Thu Oct 12, 2023 6:40 pm; edited 3 times in total |
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aberco
Joined: 05 Sep 2013
Posts: 2655
Location: Paris France
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| Posted: Wed Oct 11, 2023 6:25 pm Post subject: |
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| 1x National Semi, MM1702AQ Large logo, -2 pins $4 |
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lavrentii
Joined: 14 Feb 2021
Posts: 799
Location: Bulgaria
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| Posted: Wed Oct 11, 2023 7:24 pm Post subject: |
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| One each, thanks |
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Twinrocket
Joined: 04 Apr 2012
Posts: 558
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| Posted: Wed Oct 11, 2023 7:50 pm Post subject: |
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1x National MM5203Q 256x8 or 512x4 $15
1x National Semi. MM5204Q 512x8 $10
1x National Semi. MM1702AQ 256x8 $13 |
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Vladyak2000
Joined: 28 Jul 2020
Posts: 401
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cooperalp
Joined: 14 Feb 2009
Posts: 688
Location: Alberta
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| Posted: Thu Oct 12, 2023 11:59 am Post subject: |
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| 1x National Semi. MM5204Q 512x8 $10 |
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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