To get their CPM you were required to send them your system discs and essentially they provided a transfer service so they didn't infringe on Digital Research's copyright or distribution policy.
The ROM they provided had your address and serial number encoded on the ROM. A script has been written to update these details which can be downloaded from [https://github.com/cormacj/AmstradCPCRomHacks here].
== RSX/ROM Commands ==
{| class="wikitable"
|-
! scope="col" width="100" | RSX
! Details
|-
| <nowiki>|MYNAME</nowiki>
| Displays the name of the user/buyer of this set of CP/M Plus ROMs on screen.
<nowiki>|MYNAME</nowiki> by itself just prints the ROM owner name.
<nowiki>|MYNAME,1</nowiki> prints owner and serial number.
<nowiki>|MYNAME,2</nowiki> prints owner, serial and address.
|-
| <nowiki>|OHELP</nowiki>
| This RSX command will switch OFF the CP/M Plus expansion ROMs. All other ROMs will be initialiized again.
|-
|}
== BUILTIN commands ==
The ROM provides a set of additional commands by default. These can be listed using the command "BUILTIN".
These commands are:
{| class="wikitable"
! Command
! Description
|-
| 24LINE || ensures the scrolling error messages at bottom of screen
|-
| 25LINE || turns off that status line and puts any error message on screen under the bad command
|-
| AMSDOS || the 1K disc utility which ensures a clean exit from CP/M
|-
| BUILTIN || tells you all commands in your ROM
|-
| BORDER || changes the colour as in Locomotive BASIC
|-
| CAT || exists for those who resist DIR, again giving you an alphabetical sort and free space
|-
| CLS || clears the screen just as in BASIC, homes the cursor but does not affect screen mode
|-
| DATE || is supposed to display the system date and time.
|-
| DETAILS || inform you about the system set-up
|-
| EXPAND || assigns a character string to a lone keystroke
|-
| HOME || sends the cursor to the top left-hand corner of the screen without clearing the screen
|-
| INK || works as in BASIC
|-
| INVERSE || gives paper-on-ink colours, or reversed display, until the NORMAL command is given
|-
| KDS || controls the optional 8-bit port, if you have one
|-
| LANGUAGE || accesses the various character sets available
|-
| LPRINT || dumps a file to your printer
|-
| MODE || for columns on screen, as in AMSDOS
|-
| PALETTE || changes screen colours easily
|-
| PAPER and INK || do what normally happens in BASIC
|-
| ROMCAT || tells you what's on-board other accessory ROMs
|-
| SETLST || initialises the printer
|-
| SET24X80 || a single command combining MODE 2 and 24LINE functions, so existing PROFILE.SUB files need not be modified
|-
| CKEY || allocates an ASCII code to a Control+key combination
|-
| NKEY || for normal key assignment
|-
| SKEY || uses shift+key for ASCII assignment
|-
| SIGNON || lists accessory ROMs available for use under CP/M
|-
| WAIT || prompts user for keypress
|}
[[TFM]] has written ROMManager which can create these accessory ROMs and he provides downloads on his website for some that he has made himself.
[[User:Cormacj|CormacJ]] has written a python script to create accessory ROMS and also extract .COM files from ROMS. You can view this at his [https://github.com/cormacj/AmstradCPCRomHacks?tab=readme-ov-file#make_accessory_rompy AmstradCPCRomHacks] repository
Some emulators don't support the accessory ROMs because of the non-standard format. Arnold and Caprice32 supports these.
|-
| &10
| 3222
| Extension ROM name (note 2)
|-
1. Identification: "Graduate (C)1988". Only the first char 'G' is checked.
2. Accessory ROM name is ASCII string terminated with '$'. Graduate's Accessory ROM 1 is called "CP/M Accessory Rom 1\r\n$". You need to provide a description. At a minimum '$' on it's own is ok. The code displays the string and doesn't check if it goes past the space allocated in the ROM. Some documentation notes that this can be 32 characters long, but the Graduate Software roms will only display up to 22 characters.
3. Loading code is required. A dissassembly is shown below. The CP/M ROM executes it. Code is copied from &c070 (length &200) to &3f70 in RAM therefore copying both the loading code and the directory.
== Links ==
* [[http://futureos.cpc-live.com/ Future OS website, home of ROM Manager and TFM's Accessory ROMs]]* [https://github.com/cormacj/AmstradCPCRomHacks A python script Python scripts to update build your own accessory roms and to patch the CPM rom to update user, address, serial and passwordmessage]
[[Category:Operating System]][[Category:Expansion ROM]][[Category:CP/M]]