Z80 crt controller

Welcome, Guest. Please login or register. Did you miss your activation email? This topic This board Entire forum Google Bing. Print Search. Read times. I was thinking of issuing the CRT an eviction notice. It measures approximately 8 x 3. It looks like it was bought and then never used. This would be a very late model stand alone word processor as well, as the dates inside indicate it was made very close to the end of the run for this type of non PC word processor.

I'd like to repurpose this for something. If I could get graphics to display on it, I'm considering using it to do something like an orbit visualizer.

Now that the Kerbal Space Program telemetry plug-in outputs SoI Sphere of InfluenceI can potentially display the current SoI and render the orbit based on the already existing orbital data. It would not be particularly advanced. I'd display it as two views top down and edgewise, each side by side.

The catch is, I don't have a good way of driving this thing yet. I've looked at it visually so far today has been my first day off in a while, but my scope's triggering is wonky lately NEED to replace it.

It has 3 signal wires. The three signals are fed through some inductors and resistors, and that leads directly to a programmable logic array being used as the word processor's "processor".When searching for useful documents, tutorials and examples, I came across this page:.

The article is very well written, has many links to usefull resources, and includes sources of his own work. The source code is a work of Clark A. Calkins, who did a really great job in disassembling it from a working system.

z80 crt controller

I also used his way of bypassing the unneeded sector translation. The skeleton of the bios was ready to be adapted for my own system. Because I use single CF Card as a mass storage, all disk selecting and head-positioning subroutines home, seldsk, settrk, setsec, setdma, sectran are just variable settings operations.

All the magic is in read and write subroutines.

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For CF card low-level operations I reused much of the code from my own monitor program. Before they can be used, some assumptions had to be made:. Donn described those two processes in detail, and also presented his code.


Then, the assembled format. Both system and bios images must be loaded into their respective memory locations first using ROM Monitor fload command. The last problem to be solved before the system may finally start was to write a bootstrap program. Hardware is initialized, memory configuration changed, and jump to BIOS executed as a last step. For the initial tests I used to manually load bootcpm.

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If it is — the ROM monitor starts as usual. If no key is pressed during hard reset or power on — another piece of code is executed: the FAT16 variable area is being initialized, bootcpm.

A piece of software had to be written on the PC for this. After the code has been downloaded to RAM, the rest of the boot process takes place. However, this scheme works only for files that can fit into memory in one piece.There are also other ISA signals routed to pinheaders for any possible future uses.

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The card offers one parallel printer interface as a bonus. Here is an example program. These circuits required few small modifications to the existing hardware:. The problem was probably in lack of deglitching caps by power pinf of hte ICs used in the assembled version. After adding those caps, the amplifier just started to work as it should be.

All the basic functions of AY were checked with some simple Z80 assembler code. The amplifier, speaker and volume regulation also worked fine this time. Function select is made by A0 line. Below are schematics and board layout design in Eagle. Today I finally managed to transfer the prototype of the video board to target PCB. The design was made in Eagle as usual.

The traces layout was printed on a laser printer and transfered using an ordinary iron. The boarw was etched in B During the initial run of the board a problem came out: a black screen on the monitor connected to it.

A logic probe connected to the VGA socket revealed that there were no vertical pulses at all. After checking the solderings I found out that pin no. After fixing it, the whole system started and worked perfectly. Below is a photo of a complete set up to this day. Plans for the future? There are all the basic components on the sketch that are now on the final version of the board. The purpose of the sketch was to determine the optimal position of all components to be placed on the PCB along with all the busespower and other signal traces.

Assuming "normal" attribute. Demo for C-Z80 ". The schematics, board layout and pictures of the card itself: Schematics. Working draft of the board — unrouted tracks are connected by kynar. Solder side. Component side. Inside the system. Closeup of the new card. Additional signal connectors are visible.

Inside of the case. Dual monitor setup. The actual setup for the moment, with all the components made so far:. Post to Cancel. By continuing to use this website, you agree to their use.

To find out more, including how to control cookies, see here: Cookie Policy.Why a floppy controller when I have a perfectly good CompactFlash board? The floppy is more period accurate. The goal with retrocomputing is trying to reproduce the technology of a bygone era. For most of us that is probably the floppy disk. Of these, the easiest to obtain drives and media for is the 3.

You might even have a drive laying around from a defunct computer. I adapted this circuit for the RC This design is based almost entirely on the DiskIO V3. As you can see, the FDC implementation is fairly complex. The guts of the circuit is the FDC itself. The complication is that it uses active-high signals whereas our 3.

This leads to a whole lot of hex inverters, on nearly every signal that goes between the controller and the drive. For outputs, we us a 74HCT For inputs we use a 74HCT14, which offers a schmitt trigger input. Note also the pullups on the lines from the floppy. This leads to a 74HCT being used to demultiplex these signals. This leads us to implement a latch using a 74HCTN.

Finally, the FDC outputs its drive selects not as individual control likes but rather as a 2-bit binary value, leading to the need for a 74HCT to convert those two bits into a set of drive selects.

It outputs active-low signals so the plethora of inverters are not needed. The result is that many chips are eliminated. I built and tried out both these designs, and I vastly prefer the WD37C65 due to the reduced complexity. The reduced complexity of the WD37C65 circuit is evident from the lower chip count. In addition, having the DOR register built into the chip seems to make the programming easier. Both chips have support for these pins, although in my WD37C65 board I failed to break the pin out to a pad Bad!

Using a 5. FDC board:. WD37C65 board:. So I build the WD37C65 floppy interface. Did you already release your modification of the monitor. If not, could you do it please? Are the discrete resistors R1, R2, R3 also 1K? Do you have a BOM for the board? Would you have a DigiKey part number?

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I guess I have the same question about resistors and capacitors.We use Cookies to give you best experience on our website. By using our website and services, you expressly agree to the placement of our performance, functionality and advertising cookies. Please see our Privacy Policy for more information. All video tim ing and refresh memory addressing is provided. Forlogic to implement a complete CRT adapter for mono chrome or color applications.

RC2014 - Homebrew Z80 Computer - Retro Computer Festival 2017 - Part 2

The CPU is actuallyZ80 microcomputer system may stop its operation, so that power consumption will be reduced.

Abstract: 24cxx programmer circuit and software simple 12C programmer schematic simple 24cxx eeprom programmer schematic eeprom programmer schematic 24cxx eeprom programmer circuits V Automatic Voltage Regulator schematic pic 12c applications 24cxx programmer circuit 24cxx Text: series for a Z80 processor system. It is intended for easy CRT systems. Contens of memory is unknownless than a half nano second in standard 1u CMOS. GHz instruction frequence. Main F. Standard Z80 Family bus-request and prioritized interrupt-request daisy chains implemented without externalwithout external logic.

Abstract: No abstract text available Text: clock. It is software compatible with the. CPU can read complete channel status.

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The Z80 DMA is an n-channel. The Z80 DMA contains direct interfacing.

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They are power supply and the standard Z Family. The Z80 DMA is an n-channel silicon-gate depletion-load device packaged in. The Z80 DMA is an n-channel silicon-gate. Hardware tools include Z CPU hardware emulation, tracing bus cycles, stopping emulation on pre-defined. OK, Thanks We use Cookies to give you best experience on our website. Try Findchips PRO for z80 crt. Previous 1 2 Rochester Electronics LLC. T3flfl 0DL.A typical setup was as shown here in this picture.

However it was not long until people started to look around for a smaller, simpler and quieter mode of data entry and display. Two modes of S video display were used. One utilized part of the CPU's 64K memory address space to display text or graphics on a screen. However this board was best suited for graphics rather than text.

They allowed decent readable text to be displayed on a CRT monitor. However the text was limited to 64 characters per line, but they were fast -- even for a 2MHz Some of the early video games were developed on these boards. The Sargon chess game with graphics was an early apex of this era. These specialized microprocessors put on one chip the ability to display text on a CRT monitor utilizing just a few support chips.

These dominated the S video display board systems in the end. There were and still are four popular CRT controller chips from that era. Nonetheless, its operation was quite straightforward. One reason for its relative simplicity of operation was that some of the functions that were user-programmable in other CRT controllers were mask-programmable in the DPs.

Mask-programming of certain functions made a great deal of sense because, while many functions need to be custom tailored to a particular design, they do not need to be altered once they have been established.

The disadvantage of mask-programmable functions is, of course, that you must be a high-volume user of a particular programmed version of the DP in order to justify the cost involved. If you needed only a few devices and one of the standard pre-programmed versions cannot be used, you would not choose the The designers of th is chip had taken completely different approach to implementing the controller function.

While both the DP and devices allow you to specify many options, such as character size and timing chain parameters, the options are specified under program control instead of being mask-programmed as in the DP The unique feature of the CRT controller was the inclusion of two character buffers within the device.

The presence of these data buffers and the microprocessor interface logic provided by the imply, and in fact demand, a very specific system configuration — one that is quite different from that which would be used with the DP The device was usually used with a DMA controller such as a The DMA controller generated the screen memory addresses and loaded the data to be displayed into the 's "row buffers".

z80 crt controller

The cursor logic and blanking logic provided by the was quite extensive and allows you to easily implement a number of options with a minimum of external circuitry. Light pen logic was also provided by the The Motorola The CRT controller was somewhere between the DP device and the device in its functional organization and capabilities.

It was similar to the DP in the way that it was positioned functionally within a system; it coordinates the flow of data from screen memory to character generator logic and thence onto the CRT monitor, but data did not actually pass through the as was the case with the device.

However, the was a fully programmable device, like theinstead of being mask-programmable like the DP The pro vided screen memory addressing logic but no memory contention logic. The light pen logic, cursor logic, and scan line counters provided by the were similar to those of thealthough the scrolling and cursor logic was more limited in the Similarly, the blanking logic provided by the was minimal, although adequate, and did not provide as many options as the T he provided a full complement of programmable registers, there were however no status or control registers or signals provided by the to simplify the microprocessor interface.

The functions provided by the may appear to be somewhat more elementary than those available with other above devices. Nonetheless, the still provided several interesting func tions not available on any of the above devices. If you compare this c hip to the other CRT controllers, it may appear that the amount of logic provided by the is approximately equal to that provided by the other devices.

For example, cursor logic is provided by thebut the logic provided simply generates a continuous stream of dots at a specified cursor location.

You cannot make the cursor automatically blink, nor do you have any options in specifying the shape of the cursor symbol as was the case with the other CRT controllers.Remember Me?

After a while I realized that one XC2C would do. Unfortunately I lack the pinout datasheet of the LCD pannel and its control waveforms. I would appreciate any help you could provide. Nevertheless, I will post schematic diagram and some code as soon as I make it dance :.

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Rgds, yego. There is a general schematic jpg file, and complete VHDL code for this design. Regards, yego. You should register there, to be able to get any files posted there. Just in case you don't like registering in there, I'm sending you those files via your pm. Found it at www. I already implemented a vga controller graphical x and text mode 80 x 25 in vhdl and i can ensure you that a microcontroller will not handle the neccessary timing for video generation on a screen x We have a tight time window to get out our product.

As an enginner here I'm used for the value-added aspects of our product, not for display controllers. So far the Digital Blocks DB looks pretty complete, and we have no complaints.

Asynchronous FIFO design for the video controller 1. Video controller IP project 1.

z80 crt controller

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