TC1MB - 1MB FLASH EPROM cartridge

Purposes

• Mass memory for TC2068.

Properties

• Contains 1MB FLASH EPROM.
• Not prototiped yet.

Mounting

• Pulled into cartridge slot.

TC8255 - parallel interface, MB-02 compatibile

Purposes

• Connection of ZXVGS file server.
• Connection of Kempston Joystick.

Properties

• The PIO 8255 is available in ports #1F, #3F, #5F, #7F.

TCAY48 - the AY-3-8912 inside

Purposes

• Music and sound effects from ZX128 software.

Properties

• The AY-3-8912 is available in #BFFD and #FFFD ports.
• There's sound output in ABC stereo.
• Generator clock is 1.7MHz.

Montaż

• The small board is placed between speaker and raiator, soldered to main board, what reduces number of extra wires.
• The 1.7MHz AY clock is taken from ULA.

TCAY68 - przeadresowanie AY-3-8912

Purposes

• Music and sound effects from ZX128 software.

Properties

• The AY-3-8912 is available also in #BFFD and #FFFD ports.

Mounting

• There are 2 chips and 2 diodes added.
• Some signals from the TC2144 extension can be used.

TCDIN - the DIN monitor output

Purposes

• Video and sound in one socket.

Properties

• The sound is from AY-3-8912, stero.

Mounting

• Replaces the original chinch.

TCJOY - Kempston Joystick update in TC2048

Purposes

• Connection of autofire joystick.
• Connection of GEOS mouse.
• Connection of Amiga mouse.
• Access to 2 more input bits.

Properties

• The GND and +5V pins are moved back to their right positions.
• Input lines are shorted by joystick to GND joystick (than to +5V).

Mounting

• The common connection point of pull resistor is changed (from GND to +5V).
• Input buffer is replaced with inverse input buffer.
• Free DB9 pins are connedted to bits 5 (pin 5) and 7 (pin 9) of the port.
• Also, the edge slot /IORQGE line is upgraded to disable the joystick port also.

Purposes

• Shows power state.
• Deloads capacitors in power supply unit.

Properties

• Green light - the power is on and the computer works.
• Red light - the power supply unit is on and the computer is off.
• Dark red light - the power supply unit is disconnected from mains.
• No light - the power supply unit is disconnected or not connected to mains.

Mounting

• In the TC2048 the double color LED replaces the red one.

Purposes

• Running software dedicated to ZX128.
• Displaying hires graphis from "*.HRS" files (512×384).
• Extra 16kB can be used by ZXVGS for extensions (RSX).

Properties

• Dedicated to TC2048, TC2068 and UK2086.
• Comatibile to ZX128.
• In standard configuration there's 32kB ROM and 144kB RAM available.
• Writing to #7FFD (32765) port is slowed as every other port and consumes 12.5T.
• As the ROM the EPROM 64kB is used, thanks to this the TR-DOS can be emulated under ZXVGS (call traps). This is the TRETRAP.
• Removes snowing (screen noise) when IM 2 is selected with value 64..127 in I register.
• The printed circuit board has support for another board with AY-3-891X chip. In TC2068 and UK2086 they can be used to connect internal AY-3-8912, so the chip is available also in ZX128 compatibile ports - see TCAY.
• Extension concerns only HOME bank. The DOCK and EXROM banks remain without changes.
• Memory map.

  section D	RAM0	RAM1	RAM2	RAM3	RAM4	RAM5	RAM6	RAM7
  section C	RAM8
  section B	RAM5
  section A	ROM0	ROM1

  • RAM8 is extra memory, so the RAM2 is free for use.
  • RAM1, RAM3, RAM5 and RAM7 are slowed by ULA.
  • RAM5 and RAM7 contain screen data.
• The #7FFD (32765) port switching.

  bit	7	6	5	4	3	2	1	0
  meaning	left to future use after soldrering wires		left to future use (avaialbe on slot)	bank in section A 0 - ROM0 1 - ROM1	screen from bank 0 - RAM5 1 - RAM7	bank in section D RAM0..RAM7

Mounting

• The printed circuit board is placed upside-down over the ULA (TS2068 chip).
• Memory chips used are two 4116 and four 4164.
• Extra signals are connected with 10 deconnectable wires.
• On the main board must be added changes due to new DRAM control.

Purposes

• Remove the unwanted side effect on the screen.

Properties

• Removes hardware bug that causes grey color on the screen that appears after PAPER 0: BRIGHT 1, while in ZX Spectrum and TC2048 we get still black.
• The solution is as factoryly mounted in TC2048.

Mounting

• Near to the ULA, the OR gate and transistor are added.