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Started by eto, 18:22, 08 May 22
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Quote from: eto on 18:22, 08 May 22I got a 464 from Ebay where I unexpectedly found a Vortex Expansions RAM card - equipped with 64MB. Accoring to the documentation, it can be upgraded to 512KB by just replacing / adding RAM chips. However it's not specified exactly how.
Quote from: SkulleateR on 00:43, 09 May 22I have a working Vortex 512KB Ram expansion with BOS 2.1 rom, but I got no way to read out ... I can send it to you so you can make a dump If you want
Quote from: eto on 23:12, 08 May 224164 can be replaced by 41256 and the card autodetects the new size.
Quote from: SkulleateR on 08:37, 09 May 22How to dump it then ? I can re-insert it next weekend
Quote from: TotO on 09:44, 09 May 22It doesn't "autodetect", but just use the one more A8 multiplexed address line to go from 64 to 256.
Quote from: eto on 21:49, 10 May 22I looked into the BOS 2.1 ROM that is attached to the Wiki page and it seems not to be a valid ROM. Address of the name table is not correct and the jump block is somewhere in the middle of the ROM instead of the beginning. So if someone is willing to dump the ROM, we could update the Wiki page with a valid ROM.
Quote from: SkulleateR on 23:58, 10 May 22My offer is still valid I just need to know how to dump it if I put it back into my 464 ...
5 MEMORY &3EFF10 DATA E,7,CD,F,B9,78,32,2620 DATA 3F,79,32,27,3F,21,0,C030 DATA 11,0,40,1,0,40,ED,B040 DATA 3A,27,3F,4F,CD,F,B9,3A50 DATA 26,3F,CD,C,B9,C9,8D,060 FOR i=&3F00 TO &3F27:READ a$:POKE i,VAL("&"+a$):NEXT70 POKE &3F01,6:REM ROM number 80 CALL &3F0090 SAVE "dump.rom",b,&4000,&4000
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