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The Memotech MTX Series

MEMOTECH

Byte Size Tech Tips

 

Software

Want to know how much memory is visible to MTX BASIC in your computer?

Quite a lot are MTX500s, pretending to be MTX512s!

PRINT PEEK(64122) return values :-
0 = 1 Page of 32K RAM (MTX500)
1 = 2 Pages of 32K RAM (MTX512)
(More than 64K is not visible to BASIC)
Temporarily change an MTX512 or RS128 to a MTX500 to allow some MTX500 only games to run. This will remain in force until the next time that the MTX is reset or the power is toggled.

This can be achieved in MEMU by using the "-mem-mtx500" command line switch

Using MTX PANEL

(Display Register) "D FA7A" <ret>

(Change memory size to 32K) "0" <ret>

(Return to PANEL) <brk>

(Exit to BASIC) "b" "y"

(Restart in MTX500 mode) "NEW" <ret>

Using BASIC

(Change memory size to 32K) "POKE (64122),0"

(Restart in MTX500 mode) "NEW" <ret>

If your MTX keyboard has a problem with key bounce (multiple characters displayed for a single key press), you might want to try disabling the auto-repeat function.

This can be done by resetting the value at FD5E to 0

 

"POKE (64868),0"

If you want to quickly shut off all of the sound channels, you can use an assembly language ROM CALL to do it

"CALL #093A"

Use a ROM CALL to sound the bell like <ctrl><G>

(Interrupts must not have been disabled before the call)

"CALL #0953"

 

Hardware

DMX80 Printer

Configuration Switch Settings

The printer configuration is done by an 8 position DIP switch pack on the bottom of the printer.

 

 

This information is from the Panasonic KX-P1090 Operating Manual. The DMX80 was built by Panasonic and has the same design as the KX-P1090.

Configuration Switch Settings

# Function OFF ON Default
1 Print Mode Elite Pica ON
2 Skip Perforation Skip No ON
3 Auto LF Yes No OFF
4 7/8 Bit Select 8-Bit 7-Bit OFF
5

International Character Selection

(See table below)

ON
6 ON
7 ON
8 1 Line Paper Feed 1/6" 1/8" OFF

International Character Selection

SW-5 SW-6 SW-7 International Characters
ON ON ON U.S.A.
ON ON OFF France
ON OFF ON Germany
ON OFF OFF UK
OFF ON ON Denmark
OFF ON OFF Sweden
OFF OFF ON Italy
OFF OFF OFF Spain
FDX Power Supply

Change voltage from 240VAC to 110VAC or vice-versa

Memotech power supplies are not auto-voltage sensing so, if you need to operate your FDX at a different mains voltage level, manual intervention is required.

Unless you've picked up an FDX from outside your own country, you are unlikely to need to do this, but anyway...

The FDX uses an Astec AC8151 PSU, to change the supply voltage between 240VAC and 110 VAC, you need to change a jumper on the PSU PCB. The details are in the Astec AC8151 Specifications / Datasheet on the manuals page.

Twin drive FDXs can also supply low voltage AC power to the MTX. They have an internal transformer identical to that in the MTX PSU. See the pictures of the MTX PSU on the photos page. I **think** that you should be able to change the tap position on the primary of the transformer to change it to 110VAC. However, I have not verified this, and until this has been confirmed, it would be safer to disconnect the transformer inside the FDX and use the correct MTX PSU - assuming that you have one of course!

   

 

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