Dream Turbo Card by pear

Dream Turbo Card (design stage)

Brief information

Dream Turbo Card (DTC) is an internal card with RAM & FlashROM memory, real-time clock (RTC) and switched clock generators for the system and EXDOS.

Specification

• 1 MB SRAM, optionally 2 MB, in banks of 64KB,
• 512 KB FlashROM, 8 banks of 64 KB with the option of individual switching off, EXOS in bank 7 (always on),
• RTC clock,
• NVRAM (battery backup),
• two-channel synchronized clock signal generator:
  • system clock 4/8/12/16/20 MHz (2/4/6/8/10 MHz Z80 CPU),
  • EXDOS clock 8/9.6/10/12/13.33/16 MHz
• LCD or OLED display (2x16 chars),
• RGB LED to signal by colors the selected CPU clock:
  • 2MHz blue,
  • 4MHz green,
  • 6MHz yellow,
  • 8MHz orange,
  • 10MHz red,
• optional temperature sensor for NICK,
• configured by rotary encoder or by software.

Features

Card access

I/O address	Direction	Content
0x7E	write	NVRAM address select
	read	card status register
0x7F	write	NVRAM data
	read

Status register

Bit	Name	Content
0	EP RFSH	microcontroller saved new data into the NVRAM memory (EP should be read them, the read from NVRAM data port resets this bit)
1	CLK Sys Ready	system clock synchronized to the current setting
2	CLK EXDOS Ready	EXDOS clock synchronized to the current setting
3	RTC RQ	card microcontroller requests access to NVRAM memory
4	RTC RFSH	EP saved new data into the NVRAM memory (the read by card microcontroller resets this bit)
5	reserved	for now always '0'
6	S0	microcontroller status bit 0 (1 = temperature reading completed)
7	S1	microcontroller status bit 1 (not used yet)

Config registers

Address		Bits								Content
NVRAM	CPLD	7	6	5	4	3	2	1	0
0x7F *)	NA	Device ID								Dream Turbo Card ID is 44h
0x7E *)	NA	Hw batch no.				Hw serial no.				Hardware serial number
0x7D *)	NA	Hw ver. mj.				Hw ver. mn.				Hardware version (major.minor)
0x7C *)	NA	Fw ver. mj.				Fw ver. mn.				Firmware version (major.minor)
0x7B *)	NA	DSP	LS	RAM2	uC	TEMP		Flash		Features (below)
0x7A	3	Memory mode		EXDOS clock select			System clock select			Memory bank mode, selection of clocks (below)
0x79	2	CLK link	Flash.6	Flash.5	Flash.4	Flash.3	Flash.2	Flash.1	Flash.0	Disabling flash memory banks, bit N=1 Flash bank N disable
0x78 *)	1	S1	S0	LCD bias						uC status bits & LCD contrast
0x77 *)	0	LCD backlight		LED blue		LED green		LED red		LCD backlight and RGB LED control
0x76 *)	NA	Current temperature								Current NICK temperature
0x75	NA	Temperature limit								NICK temperature level for the alarm (0 = alarm off)

^*) read-only, data will be always overwritten by the card microcontroller,

Feature	Description	Value	Type
Flash	Flash chip type	00	Microchip SST39SF040
		01	.
		10	.
		11	.
TEMP	temperature sensor type	00	none
		01	Dallas DS18B20
		10	Analog Devices TMP03/04
		11	Analog Devices TMP05/06
uC	microcontroller type	0	MCS51
		1	AVR
RAM2	RAM capacity	0	1 MB
		1	2 MB
LS	sound transducer	0	buzzer or none
		1	loudspeaker
DSP	display type	0	OLED
		1	LCD

Memory map

MT is MICROTEAM card.

Mode 0 (default)
BANK	x0-x3	x4-x7	x8-xB	xC-xF
0x	Flash.7	CART	EPNET	EPNET
1x	MT SRAM1	MT SRAM1	MT SRAM1	MT SRAM1
2x	MT Flash	MT Flash	MT Flash	MT Flash
3x	MT SRAM2	MT SRAM2	MT SRAM2	MT SRAM2
4x	MT DRAM1	MT DRAM1	MT DRAM1	MT DRAM1
5x	MT DRAM2	MT DRAM2	MT DRAM2	MT DRAM2
6x	Flash.0	Flash.1	Flash.2	Flash.3
7x	Flash.4	Flash.5	Flash.6	RAM1.F
8x	RAM2.0	RAM2.1	RAM2.2	RAM2.3
9x	RAM2.4	RAM2.5	RAM2.6	RAM2.7
Ax	RAM2.8	RAM2.9	RAM2.A	RAM2.B
Bx	RAM2.C	RAM2.D	RAM2.E	RAM2.F
Cx	RAM1.0	RAM1.1	RAM1.2	RAM1.3
Dx	RAM1.4	RAM1.5	RAM1.6	RAM1.7
Ex	RAM1.8	RAM1.9	RAM1.A	RAM1.B
Fx	RAM1.C	RAM1.D	RAM1.E	VRAM

Mode 1 (no RAM2)
BANK	x0-x3	x4-x7	x8-xB	xC-xF
0x	Flash.7	CART	EPNET	EPNET
1x	MT SRAM1	MT SRAM1	MT SRAM1	MT SRAM1
2x	MT Flash	MT Flash	MT Flash	MT Flash
3x	MT SRAM2	MT SRAM2	MT SRAM2	MT SRAM2
4x	MT DRAM1	MT DRAM1	MT DRAM1	MT DRAM1
5x	MT DRAM2	MT DRAM2	MT DRAM2	MT DRAM2
6x	Flash.0	Flash.1	Flash.2	Flash.3
7x	Flash.4	Flash.5	Flash.6	RAM1.F
8x	not used	not used	not used	not used
9x	MT SRAM1	MT SRAM1	MT SRAM1	MT SRAM1
Ax	MT Flash	MT Flash	MT Flash	MT Flash
Bx	MT SRAM2	MT SRAM2	MT SRAM2	MT SRAM2
Cx	RAM1.0	RAM1.1	RAM1.2	RAM1.3
Dx	RAM1.4	RAM1.5	RAM1.6	RAM1.7
Ex	RAM1.8	RAM1.9	RAM1.A	RAM1.B
Fx	RAM1.C	RAM1.D	RAM1.E	VRAM

Mode 2 (no Flash)
BANK	x0-x3	x4-x7	x8-xB	xC-xF
0x	Flash.7	CART	EPNET	EPNET
1x	MT SRAM1	MT SRAM1	MT SRAM1	MT SRAM1
2x	MT Flash	MT Flash	MT Flash	MT Flash
3x	MT SRAM2	MT SRAM2	MT SRAM2	MT SRAM2
4x	MT DRAM1	MT DRAM1	MT DRAM1	MT DRAM1
5x	MT DRAM2	MT DRAM2	MT DRAM2	MT DRAM2
6x	RAM2.8	RAM2.9	RAM2.A	RAM2.B
7x	RAM2.C	RAM2.D	RAM2.E	RAM1.F
8x	RAM2.0	RAM2.1	RAM2.2	RAM2.3
9x	MT SRAM1	MT SRAM1	MT SRAM1	MT SRAM1
Ax	MT Flash	MT Flash	MT Flash	MT Flash
Bx	MT SRAM2	MT SRAM2	MT SRAM2	MT SRAM2
Cx	RAM1.0	RAM1.1	RAM1.2	RAM1.3
Dx	RAM1.4	RAM1.5	RAM1.6	RAM1.7
Ex	RAM1.8	RAM1.9	RAM1.A	RAM1.B
Fx	RAM1.C	RAM1.D	RAM1.E	VRAM

Mode 3 (no Flash & RAM2)
BANK	x0-x3	x4-x7	x8-xB	xC-xF
0x	Flash.7	CART	EPNET	EPNET
1x	MT SRAM1	MT SRAM1	MT SRAM1	MT SRAM1
2x	MT Flash	MT Flash	MT Flash	MT Flash
3x	MT SRAM2	MT SRAM2	MT SRAM2	MT SRAM2
4x	MT DRAM1	MT DRAM1	MT DRAM1	MT DRAM1
5x	MT DRAM2	MT DRAM2	MT DRAM2	MT DRAM2
6x	not used	not used	not used	not used
7x	not used	not used	not used	RAM1.F
8x	not used	not used	not used	not used
9x	MT SRAM1	MT SRAM1	MT SRAM1	MT SRAM1
Ax	MT Flash	MT Flash	MT Flash	MT Flash
Bx	MT SRAM2	MT SRAM2	MT SRAM2	MT SRAM2
Cx	RAM1.0	RAM1.1	RAM1.2	RAM1.3
Dx	RAM1.4	RAM1.5	RAM1.6	RAM1.7
Ex	RAM1.8	RAM1.9	RAM1.A	RAM1.B
Fx	RAM1.C	RAM1.D	RAM1.E	VRAM

Clock selection

SELECT	System clock	CPU clock	EXDOS clock
0	8 MHz	4 MHz	8 MHz
1	12 MHz	6 MHz	9.6 MHz
2	16 MHz	8 MHz	10 MHz
3	20 MHz	10 MHz	12 MHz
4	4 MHz	2 MHz	13.33 MHz
5	8 MHz	4 MHz	16 MHz
6	8 MHz	4 MHz	8 MHz
7	8 MHz	4 MHz	8 MHz

Minimum value of system clock in "linked mode"

When we raise the EXDOS clock frequency, the data from the FDC controller will be sent faster.
In some cases, the processor clocked by a lower frequency may not be able to process transmitted data.
To prevent this situation, it is possible to activate the "linking" mode of clock signals.
In this mode the card's microcontroller will ensure that the processor's clock frequency is not less than the minimum frequency at which the processor is able to keep pace with data from the FDC controller.

Selected system clock	4 MHz		8 MHz		12 MHz		16 MHz		20 MHz
Selected EXDOS clock	Actual frequency (System/CPU)
8 MHz	8 MHz	4 MHz	8 MHz	4 MHz	12 MHz	6 MHz	16 MHz	8 MHz	20 MHz	10 MHz
9.6 MHz	8 MHz	4 MHz	8 MHz	4 MHz	12 MHz	6 MHz	16 MHz	8 MHz	20 MHz	10 MHz
10 MHz	8 MHz	4 MHz	8 MHz	4 MHz	12 MHz	6 MHz	16 MHz	8 MHz	20 MHz	10 MHz
12 MHz	12 MHz	6 MHz	12 MHz	6 MHz	12 MHz	6 MHz	16 MHz	8 MHz	20 MHz	10 MHz
13.33 MHz	12 MHz	6 MHz	12 MHz	6 MHz	12 MHz	6 MHz	16 MHz	8 MHz	20 MHz	10 MHz
16 MHz	16 MHz	8 MHz	16 MHz	8 MHz	16 MHz	8 MHz	16 MHz	8 MHz	20 MHz	10 MHz

How to install

DTC is a complex interface. The installation requires interference with the computer.
The author has made every effort to make the interface as reliable and safe to use as possible. However,

You make any modifications inside of your equipment at your own risk !

What you need

• Dream Turbo Card
• L-connector
• new Z80 processor suitable for work at clock speeds of at least 10 MHz (eg. Z84C0010P, Z84C0020P)

Enterprise mainboard preparation

• desolder and remove internal 64KB RAM memory module (Enterprise 128 only)
• desolder the Z80 processor

Links

Thread on the Enterprise Forever forum 6Mhz and more...

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