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- MULTIFACE 128 ISTRUCTIONS
-
- The following is an excerpt from the original Multiface 128
- documentation:
-
- MULTIFACE is a registered trademark af RORANTIC ROBOT. Multiface 128
- is a true multi-purpose interface with
-
- 1) fully universal and 100% automatic back-up facility for tape,
- microdrive, Discovery, Plus D or Disciple (although the Discovery is
- not emulated, so that that feature is not usable),
- 2) 8K RAM extension - suitable for GENIE, LIFEGUARD, or as a buffer,
- 3) MULTI TOOLKIT to study/modify/develop programs, POKE infinite lives,
- etc.
-
- Multiface 128 works on the Spectrum 48/128. It can be used any time in
- any mode; it is immaterial what is inside the Spectrum at that moment
- or how or from what source (tape, disk, cartridge) it has been loaded
- (or typed in, etc.). Multiface does not save programs, but computer
- contents (compressed RAM image). Upon returning from the M128 or upon
- re-loading, the programs continue as if never frozen. To use the M128:
-
- 1) Push the NMI key (F5)
- 2) Select the required option from the menu
-
- The MAIN MENU options are:
-
- Exit: to abandon the Multiface and exit to BASIC (provided BASIC is
- present). By using exit, you come out of the Multiface entirely.
- All efforts are made to preserve the current program in the Spectrum
- intact. The main condition is the existence of standard system
- variables - without these the Spectrum crashes. A successful exit
- gives you full access to the program. To restart it, if needed, you
- must know the starting line or address. Exit is impossible in the
- 128K mode when the edit ROM is paged and Spectrum ROM is off; in such
- cases it does not appear on the menu at all. All in all, you can
- only exit to BASIC if it exists - it is like jumping into a pool: a
- joy if it's full of water, a crash if there is none.
-
- Return: to continue the program.
-
- Save: to proceed to the SAVE routines:
- a) input the name of the program. Up to 9 characters (or just press
- ENTER to the input RUN automatically as a default)
- b) save to: Tape, Microdrive, Opus [does nothing], Disciple (use D
- for Plus D too). You can save the entire program (including the
- screen), or the screen only. Programs are compressed to take the
- minimal room possible and to load faster. Screens saved on their
- own are left intact as standard Spectrum screens.
- c) Format microdrive cartridges. Cartridges are automatically named
- after the programs to be saved.
-
- Tool: to access the MULTI TOOLKIT routines.
- quit - to return to the main menu
- Enter - to PEEK and scroll through addresses or to POKE
- Space - to allow you to type in a new address
- hex - to toggle between hexadecimal and decimal display format
- reg - to point to the Z80 registers as they were when the program was
- frozen
- window - to open a window with full on-screen editing using the
- cursor keys. The flashing window address corresponds to the
- address in the bottom edit line. The window display is by default
- in hex, but you can change it to
- text - to see the 128 bytes in the window as ASCII text.
- select - to inspect RAM banks 0-7 in 128K mode. Press s + the bank
- number
-
- Print - to dump screen to printer. For printer interfaces using COPY
- command. You can POKE address 8200 (decimal) with the following
- values, if you wish to
- 113 to turn the line feed on (cr+lf)
- 112 to turn the line feed off (cr)
- 17 to dump screen as text with the line feed on
- 16 to dump screen as text with the line feed off
-
- Jump - not to return, but jump to another address. Strictly for
- machine code users only. Enter the address to jump at 8192/3
- (low/hi). You can jump to Spectrum ROM/RAM and to M128 8K RAM. As
- the M128 overshadows the ZX ROM (8192-16383), address 8194 determines
- the paging status: if it is 0, the M128 RAM remains paged, 1 pages
- out the RAM and any other value disables the jump command completely.
- [Note: if it is 0, also the M128 ROM (0-8191) remains paged.]
-
- You can jump from the main menu, and you can also pre-program M128 to
- jump directly upon NMI (F5) and by-pass the M128 ROM software
- entirely. To program the direct jump, POKE 8192-3 with the jump
- address, and then also 8195-7 with a special identification word RUN
- (i.e. 82,85,87). Whenever you press NMI now, you will jump to the
- predefined address and not see the M128 menu. To return from your
- program to the program you stopped, use RST 0. To revert back to the
- Multiface normal operation, press NMI and BREAK (shift+space)
- simultaneously. This also cancels the code word RUN.
-
- In standard mode M128 uses 8192-11144 as a buffer (8192-13496 once
- you proceed to SAVE) and overwrites anything in there. Using direct
- jump, you have 8257-16338 available.
-
- Clear - to clear the extra 64K RAM bank (in 128K mode only!). You can
- clear any time, but it is only useful with 48K programs in 128K mode.
- However, you should save 48K programs in 48K mode anyway. Also, for
- obvious reasons, clearing the banks in 128K programs is not a good
- idea.
-
-
- The actual M128 has a software on/off switch, so that it could be made
- completely invisible to programs until the NMI switch was pressed. This
- software switch is not emulated. The M128 could be turned off by
- pressing 'O' in the main menu; this does not work on the emulator. You
- can turn off the M128 in the Select Hardware (F9) menu.
-
- Using the extra 8K RAM - M128 has an 8K Rom containing its own
- software, and an 8K RAM used as a buffer. You can use the 8K RAM for
- your own mcode routines or for data (but not for BASIC). The RAM must
- be paged in machine code to be accessed: use IN A,(191) to page in, and
- IN A,(63) to page out. The BASIC In and Out commands can not be used
- here (they work, but result in a crash). The 8K RAM overshadows the
- Spectrum ROM and thus anything contained in the M128 RAM cannot make
- any calls to the Spectrum ROM, as they both occupy the same area. The
- M128 RAM routines should therefore be self-contained, independent of
- the Spectrum ROM.
-
- Poking infinite lives - To POKE, say 31000,0, first load the program as
- usual. When it's loaded, press NMI (F5) and select the tool by
- pressing T. When the toolkit menu appears, press SPACE and type 31000.
- Once you type 5 digits the cursor automatically moves to the value
- field (no need to press ENTER), so type 0 (value is 1-3 digits long)
- and this time press ENTER. Finally press Q to quit the toolkit and R
- to return to the program.
-
-
- The Multiface 128 was designed by Romantic Robot UK Ltd.
-
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