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radionic: PPI and documentation.
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Robbbert
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@ -28,7 +28,7 @@ Komtek 1 (Radionic R1001) memory map
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3c00-3fff static video RAM and colour ram, banked
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4000-ffff dynamic main RAM
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Printer: Level II usually 37e8
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Printer: Usually 37e8, but you can use the PPI instead.
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Cassette baud rate: 500 baud
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@ -49,35 +49,53 @@ SYSTEM commands:
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- / to execute last program loaded
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- /nnnnn to execute program at nnnnn (decimal)
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About the RTC - The time is incremented while ever the cursor is flashing. It is stored in a series
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of bytes in the computer's work area. The bytes are in a certain order, this is:
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seconds, minutes, hours, days. The seconds are stored at 0x4041.
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A reboot always sets the time to zero.
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Inbuilt Monitor - its existence is not revealed to the user.
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- SYSTEM then /12710 = enter machine-language monitor
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Monitor commands:
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- B : return to Basic
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- Dnnnn : Dump hex to screen. Press down-arrow for more. Press enter to quit.
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- Mnnnn : Modify memory. Enter new byte and it increments to next address. X to quit.
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- Gnnnn : Execute program at nnnn
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- Gnnnn,tttt : as above, breakpoint at tttt
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- R : modify registers
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The monitor appears to end at 33D3, however the rom contains more code through to 35EB.
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But, the 34xx area is overwitten by the optional RS-232 expansion box.
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About the RTC - The time is incremented while it is enabled via the Machine Configuration. The time
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is stored in a series of bytes in the computer's work area. The bytes are in a certain order,
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this being: seconds, minutes, hours, days. The seconds are stored at 0x4041. A reboot always
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sets the time to zero.
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About colours - The computer has 16 colours with a byte at 350B controlling the operation.
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POKE 13579,2 : monochrome
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POKE 13579,4 : programmable colour
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POKE 13579,12 : automatic colour
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There's no schematic or documentation of the Colour Board, however some more information...
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More information was discovered, this being
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- It doesn't have to be 350B (13579), anything in the 35xx range will do.
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- d0 : write of vram goes to vram (0 = yes, 1 = no)
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- d1 : write of vram goes to colour ram (0 = yes, 1 = no)
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- d2 : colour enable (0 = monochrome, 1 = colour)
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- d3 : programmable or automatic (0 = programmable, 1 = automatic)
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List of colour codes:
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0 = off white; 1 = light green; 2 = red; 3 = dark green; 4 = blue; 5 = greenish blue;
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6 = rose red; 7 = dusty blue; 8 = greenish yellow; 9 = light yellow (greenish); 10 = golden red
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11 = grey; 12 = reddish green; 13 = pale yellow; 14 = orange; 15 = ogre green.
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As you can see, the descriptions are quite vague, and appear to be background only. The foreground
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is assumed to always be white.
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The colour codes and names are listed in the palette below. The descriptions are quite vague,
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and appear to be background only. The foreground is assumed to always be white.
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Automatic is a preset colour set by internal jumpers.
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- No schematic or technical info for the colour board
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- No information on the settings of the Automatic mode
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- The "User Friendly Manual" has a bunch of mistakes (page 15).
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- When reading video ram, it is not known how this is affected if colour ram is enabled
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- It's not known if colour ram can be read. But LDOS won't scroll if it can't always read vram.
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- No colour programs exist in the wild, so nothing can be verified.
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So, some guesswork has been done.
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About the PPI - A selling point of this computer was the ability to sense and control external gadgets.
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For example, it could join to a temperature sensor, and when the temperature reached a certain value
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the computer could instruct a device to turn on or off. There's 4 input jacks and 6 output jacks.
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The PPI can also control a parallel printer. To enable this, enter SYSTEM then /12367 .
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About the RS-232 unit - This is an external box that plugs into the expansion port. It takes over memory
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region 3400-34FF, although it only uses 3400 and 3401. It has a baud generator consisting of 2x 74LS163
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and a dipswitch block to choose one of 5 possible rates. The UART and RS-232 parts are conventional.
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There's no programming of the unit from the inbuilt roms; you need to write your own.
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********************************************************************************************************
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To Do / Status:
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@ -85,7 +103,6 @@ To Do / Status:
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- Difficulty loading real tapes.
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- Writing to floppy is problematic; freezing/crashing are common issues.
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- Add rs232 board
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- Add fdc doubler (only some info available)
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*******************************************************************************************************/
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@ -122,6 +139,10 @@ private:
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void cctrl_w(offs_t offset, u8 data);
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void video_w(offs_t offset, u8 data);
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u8 video_r(offs_t offset);
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void ppi_pa_w(offs_t offset, u8 data);
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void ppi_pb_w(offs_t offset, u8 data);
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void ppi_pc_w(offs_t offset, u8 data);
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u8 ppi_pc_r(offs_t offset);
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void mem_map(address_map &map);
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static void floppy_formats(format_registration &fr);
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u8 m_cctrl = 2;
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@ -411,6 +432,34 @@ void radionic_state::cctrl_w(offs_t offset, u8 data)
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m_cctrl = data & 15;
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}
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void radionic_state::ppi_pa_w(offs_t offset, u8 data)
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{
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// d0-7: Data to extra printer
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}
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void radionic_state::ppi_pb_w(offs_t offset, u8 data)
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{
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// d0-7: Outputs to control jacks (only 6 connected up by default)
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}
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void radionic_state::ppi_pc_w(offs_t offset, u8 data)
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{
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// Printer control
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// d0: Strobe
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}
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u8 radionic_state::ppi_pc_r(offs_t offset)
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{
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// Printer Status
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// d1: Busy
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// d2: out of paper
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// d3: Unit select
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// Sensor Status
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// d4-7: sensing inputs
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return 0xFF;
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}
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void radionic_state::floppy_formats(format_registration &fr)
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{
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fr.add(FLOPPY_JV1_FORMAT);
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@ -492,10 +541,10 @@ void radionic_state::radionic(machine_config &config)
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// Interface to external circuits
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I8255(config, m_ppi);
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//m_ppi->in_pc_callback().set(FUNC(pulsar_state::ppi_pc_r)); // Sensing from external and printer status
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//m_ppi->out_pa_callback().set(FUNC(pulsar_state::ppi_pa_w)); // Data for external plugin printer module
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//m_ppi->out_pb_callback().set(FUNC(pulsar_state::ppi_pb_w)); // Control data to external
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//m_ppi->out_pc_callback().set(FUNC(pulsar_state::ppi_pc_w)); // Printer strobe
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m_ppi->in_pc_callback().set(FUNC(radionic_state::ppi_pc_r)); // Sensing from external and printer status
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m_ppi->out_pa_callback().set(FUNC(radionic_state::ppi_pa_w)); // Data for external plugin printer module
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m_ppi->out_pb_callback().set(FUNC(radionic_state::ppi_pb_w)); // Control data to external
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m_ppi->out_pc_callback().set(FUNC(radionic_state::ppi_pc_w)); // Printer strobe
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}
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@ -89,7 +89,6 @@ About the system80 - Asian version of trs80l2, known as EACA Video Genie. In USA
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- Gnnnn : Execute program at nnnn
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- Gnnnn,tttt : as above, breakpoint at tttt
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- R : modify registers
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The monitor works on the radionic too.
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About the ht1080z - This was made for schools in Hungary. Each comes with a BASIC extension roms
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which activated Hungarian features. To activate - start emulation - enter SYSTEM
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