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05 June 2022, 17:43
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#721 |
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Registered User
Join Date: Nov 2021
Location: Haugesund
Posts: 4
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Anyone have a good seller for eeproms 27C400; 27C800 with 105ns to share?
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05 June 2022, 18:16
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#722 |
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Registered User
Join Date: Oct 2012
Location: Krypton
Posts: 1,210
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I have used these and they were fine
https://www.aliexpress.com/item/4001...30f01802bZGjrJ |
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01 July 2022, 11:45
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#723 |
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Registered User
Join Date: May 2022
Location: UK South East
Posts: 53
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Has anyone considered using EEPROM's instead of EPROMS to replace the kickstart chips?
Something like this: https://www.mouser.co.uk/datasheet/2...2C-2584985.pdf I've not looked carefully, but first scan would suggest maybe it could replace a 27C400. Surface mounted on a carrier PCB could be a nice low profile solution and no more faffing with UV erase. What am I missing? |
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04 July 2022, 04:55
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#724 | |
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Registered User
Join Date: Nov 2016
Location: Fadden ACT Australia
Posts: 128
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Quote:
They are also available in GGLABS eBay store: search for "GGLABS F2R16" on eBay. |
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08 March 2023, 16:34
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#725 |
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Registered User
Join Date: Feb 2023
Location: Sv.nedelja/Croatia
Posts: 69
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Hi,
Question : have 27c800 eproms ... A1200 So I can add 1MB files in eprom ... split it ... byte swap them ... double them ... burn them ... Did someone manage to do that with 47.102 ROM's ??? Should I put the latests libs and devices in it ??? |
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08 March 2023, 19:17
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#726 |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,861
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You can make 2MB ROMs with those. 27c400s are enough for 1MB ROMs.
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09 March 2023, 13:29
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#727 |
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Registered User
Join Date: Feb 2023
Location: Sv.nedelja/Croatia
Posts: 69
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Is there any tut how to make the 2MB ROM's ...
What to put in any sugestions ??? |
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13 April 2023, 02:47
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#728 |
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Registered User
Join Date: Mar 2017
Location: Rhode Island / United States
Posts: 201
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Each ROM in a 16-bit (single ROM) configuration is a 512K bank. You burn your choice of kickstart to each bank, and you select your banks by keeping the pins for the upper address lines high or low.
Same applies for the dual-ROM systems, but you must split the image properly, then burn the half-images into the proper banks. It gets more complicated if you play with the second $E00000 extended range options, as you have to make 2 banks appear in the native 512K of each high and low ROM. |
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20 August 2023, 18:30
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#729 |
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Registered User
Join Date: Sep 2022
Location: Washington, DC - USA
Posts: 10
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I have a Phonesoap UV Phone "cleaner" and was wondering if anyone has been successful in getting this type of device to erase 27C400 EPROMs?
I feel like I am missing something with the UV light type or what will really erase the EPROM. |
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20 August 2023, 20:14
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#730 | ||
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Unregistered User
Join Date: Sep 2012
Location: Copenhagen / DK
Age: 43
Posts: 4,190
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Quote:
Quote:
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20 August 2023, 22:42
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#731 |
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Registered User
Join Date: Sep 2022
Location: Washington, DC - USA
Posts: 10
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I found one that I had bought a while ago that I forgot about. A PhoneSoap GO worked with some caveats.
I had to set the window area right over the light. It also took close to an hour to fully erase the EEPROM but it did work. Anyway thank you for the quick response! |
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