Memotech Limited MTX 500 User's Guide download pdf (Page 18)

SDX BASIC ROM

The SDX BASIC ROM sits in ROM page 5.

The SDX ROM in a real SDX provides USER commands to MTX BASIC, allowing the user to read and

write files on a floppy disk. The SDX ROM in REMEMOrizer is pretty much the same as the

REMEMOTECH version.

Instead of floppy disc, it supports SD Card partition 0. Unlike the original SDX ROM, this version also

supports 320KB RAM Disc. In other words, the drive configuration supported is B:18,F:52.

To support these disk types, it was necessary to steal areas of high memory that would otherwise be

used by the NODE RING ROM. This support is therefore incompatible with the NODE RING ROM.

Remember, to use the SDX support, you must first use ROM 5. The first drive (SD Card partition 0)

must contain a 59K CP/M system. If this is not the case, you'll get a DISC ERROR.

If you try to use USER FORMAT, you will get a Mistake error. Track and sector based formatting

doesn't make sense for SD Card or RAM Disc media. Instead use the REFORMAT.COM CP/M

executable.

TAPE SUPPORT

The tape support is physically present in the SDX ROM, and the OS ROM is patched to jump there.

By default, REMEMOrizer loads and saves to virtual cassette, as administered using the

REZTAPE.COM command.

However, if you press SW2, then a little red LED lights up to indicate that virtual tape support is

disabled. In this mode, real cassette load and saving occurs. This can happen because the code at the

end of SDX ROM 5 also includes a copy of the code normally present in the OS ROM.

(Refer to Chapter 3, Installation, to identify the position of switch SW2.)

(Refer to Chapter 4, Operation, for a description of the use of SW2 to select the tape option.)

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 32 33

No comments

Memotech Limited MTX 500 User's Guide Page 18