Changes

:* A. While everything is switched off and if you have the right set of tools and have any electrical knowledge, remove six screws from the keyboard and carefully take the keyboard a part. Look for the CPC 464 ROM chip with the letters printed "IC103 AMSTRAD 40009" which is already soldered onto the motherboard. Here comes a real challenge.... <BR>::<BR>::Firstly, you have to remove additional nine screw using a philips screwdriver. And then, you have to de-soldier all the legs from the CPC 464 ROM chip, remove it and replace with [http://www.maplin.co.uk/p/dual-in-line-socket-28-pin-bl21x DIL Socket 28-Pin] (Maplin ref no: BL21X, which it costs about 14p each - current price is now 44p 29p eachor can be purchased from [https://www.ebay.co.uk/sch/i.html?_from=R40&_sacat=0&_nkw=DIL+Socket+28-Pin&_sop=15 eBay]), making it easier to swap 464 or 6128 ROMs and visa versa, then solder all the legs from that socket onto the motherbaord.<BR>::<BR>::Next, put the CPC 6128 ROM chip printed "AMSTRAD 40025 8902 B" inside the DIL 28-way socket. Put all the bits into place, put the keyboard cover back on and then put six screws back on. Now to test your handy work... After your computer powered up with all accessories, your screen should show exactly the same as [[Media:Cpc6128.gif|CPC 6128 start-up]] screen.<BR>

:'''NOTE: ''' All versions of [http://www.old-computers.com/museum/computer.asp?st=1&c=84 CPC 464] keyboards including Arnold 1 (according to [http://genesis8.free.fr/amstrad/faq/amstrad.php#A comp.sys.amstrad.8bit FAQ]) version with big "AMSTRAD" letters printed onto the keyboard, like the one shown on the [http://www.old-computers.com/museum/photos/s_amstrad_464_inside1.jpg photo] - #'''12''': 32 Kb ROM memory containing the operating system and Locomotive Basic. Also with the "[http://cpctech.cpc-live.com/docs/costdown.html Cost-Down]" version as well doesn't have a socket to remove and replace Operating System ROM chips, instead all the legs are soldiered on and its impossible to remote it straight away, unless you know how to de-soldier - 31/6/05.<BR>::<BR>::* B. Simply exchange your CPC 464 keyboard to Amstrad Specialist ([https://web.archive.org/web/20100201160217/http://www.midnight.uk.com:80/merline/ ArthurCook]) for another CPC 464 keyboard with CPC 6128 ROM chip fitted (That's what I did on 12with [[User:Jonathanen#17th_June_2000.2A_-10-00_expanded_to_CPC_6128_spec._.2821.29|mine]] on Thursday 12th Oct 2000, by the way, as while I was rushing to get home from Worthing and that time, I didn't know how to replace Operating System ROMs) or ask him to do it for you and paid for it, of course. <BR>

Now you have a choice to do one of the following optionoptions:<BR>

* A. Replace the [[AMSDOS ]] / CP/M bootstrap ROM with ParaDos [[ParaDOS]] ROM inside the disc interface (optional, but it allows you to use the full capacity on 3.5" disc drive).

'''RECOMMENDED''' to do so, if you're either usingeither:<BR> * [[464Plus_Conversion#Jonathanen.27s_Easy_Way_To_464.2B_Conversion|Upgraded CPC 464+ to 6128+ spec ]] <BR>* Unexpanded CPC 464 without CPC 6128 OS/BASIC ROM installed with , having only both DDI-1 3" & 3.5" external disc drives connected only.

To do that, you must remove six two screws first, open the cover, carefully remove the [[AMSDOS ]] ROM chip with "AMSTRAD 40009" printed on top of it and replace it with ParaDos [[ParaDOS]] ROM. Then put the cover back on, and put the six two screws back on. <BR>

* B. Leave the [[AMSDOS]] / CPM bootstrap ROM inside the [[Media:Gerald_DDI-1_MF0004B.jpg|disc interface]] (if you want to use DR. LOGO 2 & 3 on upgraded CPC 464) and put [[ParaDOS ]] ROM inside the [[Rombo_Rombox|Rombo ROMBOX ]] with other ROMS (as shown belowin [[Expanding_from_CPC_464_to_CPC_6128_Spec#Step_3|step 3]]).

* [[Rombo_Rombox|Rombo ROMBOX]] with following ROMS from RAM pack pass-through connector (- '''OPTIONAL!! ''' But it makes computing much easier, leaving out both slots 0 ([[BASIC]])& 7 ([[AMSDOS]]) remaining unused: <BR>:* Slot 1: [[UtopiaBCPL]] - General purpose utilitiesCompiler from PJB & [[Arnor|Arnor Ltd.]]:* Slot 2: [[BCPLMaxam]] - Compiler Assembler from PJB & [[Arnor|Arnor Ltd.]] :* Slot 34: [[MaxamParaDOS]] - Assembler from Arnor Ltd'''***''' '''ONLY!!''' If you choose to leave [[AMSDOS]] ROM chip inside the [[Media:Gerald_DDI-1_MF0004B. jpg|disc interface]] as mentioned in step 2B '''***''' :* Slot 45: [[Protext]] - Word processor from [[Arnor|Arnor Ltd. ]] :* Slot 56: or [[ParaDOSUtopia]] as well - only, if you choose to leave the AMSDOS ROM chip inside the disc interface General purpose utilities* [[Amstrad_Disk_Drive|Amstrad DDI-1 External 3" Disc Drive]] with Disc interface (a choice of either replaced with [[ParaDOS ]] ROM - '''recommended ''' to do it for [[464Plus_Conversion#Jonathanen.27s_Easy_Way_To_464.2B_Conversion|upgraded CPC 464+ to 6128+ spec ]] or leave the [[AMSDOS ]] ROM inside the disc interface - for using DR. LOGO on upgraded CPC 464 to 6128 spec, '''NOT''' [[464Plus_Conversion#Jonathanen.27s_Easy_Way_To_464.2B_Conversion|upgraded 464+]]) from the pass-through connector on the [[Rombo_Rombox|ROMBOX]]* 3.5” External disc drive with external power supply, [[Side Select Switch|side switch]], [[Adding_3.5"_drive_to_CPC464#3.5.22_READY_Signal_Test|"READY" signal]] and a drive lead with , DI-2 Inter-connecting Lead & [http://www.ebay.co.uk/itm/5Pcs-2-54mm-2x17-Pin-34-Pin-IDC-Male-Box-Header-Cable-Connector-Mounting-Ear-/172302047820?hash=item281e009a4c:g:KJkAAOSwl5dZdv-I 34 way IDC Male connector ] (34 pins sticking out) to the onto drive B connector on disc interface (back of DDI-1 disc interface ) and place this disc drive on top of DDI-1 external disc drive - if you not sure how to, then follow "[http://www.cpcwiki.eu/index.php/Adding_3.5%22_drive_to_CPC464 Adding 3.5" Disc Drive 'B' - For CPC 464 Series with DDI-1 only!!]" instructions.<BR><BR>

Follow the [[Adding_3.5"_drive_to_CPC464#3.5.22_READY_Signal_Test|"READY signal" signal]] instructions (if necessary) for 3.5" disc drive Ready signal test.<BR>

[[Image:CPC46426128_dualROM.JPG|thumb|600px|centre|Another upgraded Amstrad CPC 464 except with dual Amstrad CPC 464 & CPC 6128 OS/BASIC ROM Chips fitted inside older CPC 464 keyboard, a 464 / 6128 Mode switch on left hand side and 2 x 3" FD-1 drives (DDI-1) - purchased from eBay on 4th March 2012. Both PARADOS ROM replaced inside disc interface & Dk'tronics 64K RAM pack (SMD version) wasn't included in the part of the package and it was purchased separately.]] = Pictures = <BRgallery caption="Archives"> Image:AmstradAction004--074.jpg|AA Issue 4 - Page 74Image:AmstradAction004--075.jpg|AA Issue 4 - Page 75Image:AmstradAction030-26.jpg|AA Issue 30 - Page 26Image:AmstradAction046-16.jpg|AA Issue 46 - Page 16Image:AmstradAction046-17.jpg|AA Issue 46 - Page 17 </gallery> 

* [httphttps://www.retrocomputers.euonline/2012/06/25/amstrad-cpc464-upgraded-to-a-cpc6128-how-to/ How to convert a Amstrad CPC464 into a CPC6128| Retro Computers]<BR>* [https://www. retrocomputers.online/2012/06/how-to-install-parados-into-the-amstrad-dd-1-disk-interface/ How to install PARADOS into the Amstrad DDI-1 disk interface | Retro Computers]<BR>