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#541 |
Paranoid Amigoid
Join Date: Mar 2008
Location: Athens/Greece
Age: 45
Posts: 1,978
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#542 |
Registered User
Join Date: Oct 2009
Location: Italy
Age: 45
Posts: 197
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Hi,for Amiga 600/1200 uv eprom 27C4001 is compatible?
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#543 |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 44
Posts: 9,964
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It is not compatible with the kickstart ROM socket of any production Amiga.
Perhaps I should use this opportunity to repeat that the compatible parts are: 256k: 27c200, mx23c2100 512k: 27c400, mx23c4100 If you're considering ANY other part than those four, it will not be a drop in replacement and it is up to you to look at the datasheets and make a personality module. |
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#544 |
Registered User
Join Date: Oct 2009
Location: Italy
Age: 45
Posts: 197
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Ok,i have a Hitachi HN27C4000,i just wanted to know if those were compatible.
Many Thanks |
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#545 |
Registered User
Join Date: Mar 2010
Location: Napoli, Italia
Posts: 76
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Endianness
Why do Willem programmers store 16 bit words in Hi/Lo order? I mean, if you have data lines b0...b15, you store the low byte first (b0...b7), then the high byte (b8...b15), don't you?
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#546 |
Registered User
Join Date: May 2014
Location: Malaysia
Posts: 115
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#547 | |
Registered User
Join Date: Mar 2013
Location: Slovenia
Posts: 138
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Quote:
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#548 |
Registered User
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My Prob : i want to put Kickstart 2.04 in my A500 Boosted to A500+
First was my A500 with Motherboard REV 8.1A Upgraded to A500+ with 1Meg chip ram and Clock added. I just Burn a 27c400 eprom with Kickstart 2.04 (swapped bytes) and now my Amiga still show a blank screen... If i put the Original 1.3 ROM, all is fine... Help ! |
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#549 | |
PSPUAE DEV
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Quote:
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#550 |
We need more scans!
Join Date: Feb 2010
Location: Copenhagen / Denmark
Age: 49
Posts: 326
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don't forget to concatenate the binary file 2 times as the eprom is larger than the file.
the filesize needs to be 1 meg in size for the 27c400 for windows: copy /b rom.bin+rom.bin newrom.bin or use the free HxD hexeditor |
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#551 |
Registered User
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copy /b rom.bin+rom.bin newrom.bin done but not working
![]() ![]() No pin to bend or to connect ??? |
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#552 |
We need more scans!
Join Date: Feb 2010
Location: Copenhagen / Denmark
Age: 49
Posts: 326
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if you have the bin file from an original rom, you don't need to byteswap it.
do you do a verify after burning the rom? |
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#553 |
Registered User
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yes, auto-verify in my GQ4X programmer and i check if all the data are here each time by re-reading the burned eprom... will re recheck this evening... thx
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#554 |
Registered User
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check check re check.. don't want to boot
![]() I already do the same thing for an old A600 and my A1200 without any problem... but this A500(+) is a mystery ![]() edit: just tested with KS 1.2.. and it's working... so why this 2.04 refuse to work ? (md5 is ok : DC10D7BDD1B6F450773DFB558477C230) Maybe the 1Mb chip hack ??? JP2 JP7 jumper ??? Last edited by Foul; 09 June 2014 at 21:07. |
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#555 | ||
Registered User
Join Date: Aug 2013
Location: Croatia
Age: 43
Posts: 341
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Quote:
Quote:
I've read that people had your symptoms when they burned it to 150ns EPROM while that same EPROM worked fine in A2000. |
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#556 |
Registered User
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they are 150ns but working well with burned 1.2 and 1.3 kickstart !!!
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#557 |
Registered User
Join Date: May 2014
Location: Malaysia
Posts: 115
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From what I've read, 1.3 is only 256k in size so it'll accept 150ns parts, but when you burn a 512k chip, needs to be 120ns or faster... if you check it's contents, you can only see the first 256k which is fine for KS 1.3 and below... Please correct me if I'm wrong...
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#558 |
Registered User
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is there another eprom i can try ? 27c800 ? or only 27c400 ? all my 27c400 are 150ns
edit: just tested with a genuine A600 2.05 Kickstart from a friend and it works ! so it's 99% an eprom prob ![]() Must find some 27c400 120ns or faster... ![]() Last edited by Foul; 10 June 2014 at 19:13. |
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#559 |
We need more scans!
Join Date: Feb 2010
Location: Copenhagen / Denmark
Age: 49
Posts: 326
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#560 |
Global Moderator
Join Date: Jan 2004
Location: Oxford
Posts: 14,657
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AFAIR some (all?) A500's need a jumper wire between two pins (1 & 31) on the EPROM to support 512Kbyte EPROMs.
Without it A17 is floating. Not sure a Rev8.1A would be affected though. |
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Thread | Thread Starter | Forum | Replies | Last Post |
Problems with 3.1 kickstart in WHDload | zap64uk | project.WHDLoad | 7 | 30 March 2010 00:23 |
Burning Kickstart Roms | clueless | Hardware mods | 8 | 06 January 2010 13:31 |
Kickstart problems... | asm1 | project.WHDLoad | 2 | 14 March 2009 15:29 |
Problems with Kickstart 3.1 [was: various posts in a thread in News] | ARTHUR071169 | project.GameBase Amiga | 33 | 15 October 2006 13:33 |
Kickstart 3.1 problems | adgloride | support.Hardware | 5 | 08 June 2004 03:57 |
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