Category Archive : Amiga 1200 schematic
This banner text can have markup. Search the history of over billion web pages on the Internet. Manuals, instructions and schematics for the Commodore Amiga family of computers. Media Type Media Type. Amiga Manual: X-Copy Professional Siren Software Topics: disc, files, backup, discs, copying, select, selected, file, floppy, professional, external disc, Amiga Manual: A Plus Service Manual Commodore Topics: assy, nagar parishad, data, address, manual, amiga, vcc, ram, clock, control, spare parts, register address, Amiga Manual: Lattice C v5.
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Amiga Manual: A System Schematics Commodore Topics: assy, ohm, vcc, ntsc, mhz, keyboard, pal, schematics, schematic, host, spare parts, power supply, Amiga Manual: Introduction to the Amiga Commodore Topics: amiga, disk, workbench, icon, amigados, key, gadget, select, mouse, color, text cursor, icon Amiga Manual: A System Schematics Commodore Topics: assy, keyboard, manual, workbench, shipping, schematics, disk, mhz, pcb, ohm, quick connect, mouse Amiga Manual: Introduction to the Amiga Commodore [a] Topics: amiga, disk, workbench, icon, key, amigados, gadget, select, cli, color, text cursor, amiga Amiga Manual: Confidential Parts Information Commodore Topics: assy, nla, pcb, manual, rom, user, res, diag, cable, cap, credit billing, return dealer, pcb assy, Amiga Manual: A System Schematics Service Addendum Commodore Topics: rev, commodore, floppy, drtr, graphics, mhz, decoupling, pcb, clock, rom, mentor graphics, internalThis is a finalized project.
It works without any bug. The schematic is published, build your own version and send me a photo. But I soon confronted the reality: it hasn't got enough memory available, the HDD is not included in the base product price etc.
The 2. It was a "regular" price for a 2. But the RAM was a completely different thing. Partial answer is: it costed a lot more than any "Taiwan assembled" IBM clone. Only Apple was able to sell the x overpriced Macintosh machines But this is a completely different story.
Lets go back to the original topic. The next step was clear: adapt it somehow to fit in Amiga But it wasn't as easy as it looked to be. I was seeking for help everywhere: asked various electronic engineers, everybody who ever worked with digital electronic Needless to say, no one was able to help me to redesign the project, or at least to understand how it works.
It I've got an idea: why to not try again to build the original John Kamchen RAM expander, but now in original form, for an Amiga ? The first test results were promising: the Amiga booted up successfully, the CPU did not burn out etc. It was readable and writable, but the content was always corrupt. It forgot the data soon after I have entered it. I have tried to fix the hardware for 2 weeks, without any success. And I gave up Then I began to build a new RAM board with an entirely new approach.
It was clear: without completely understanding the theory of the operation of dynamic RAM and the MC on a hardware level it is impossible to realize a such project. And the problems began. The board worked properly for hours, but sometimes the Amiga crashed strangely. It became clear the system crashed when I launched Turbo Imploder, Hippoplayer or any other music player software.
Meanwhile I have tried every possible and impossible combinations to fix it. A new, veroboard based prototype has been built to check the noise level with different PCB layouts. The veroboard produced times less noise than the plastic breadboard version but the same bug was still there. After 6 weeks of testing and debugging daily hours it became clear there is a mistake in my design: I didn't check carefully the CPU timing diagrams and I have used the same timing for bus master cycle case 2 as for case 1 which led to a shortened RAM access cycle ns RAM access cycle is used, the remaining cycle is for the refresh.
You can see the strange thing on the screenshots below: when the code is executed step by step, it works perfectly. Once the reason was found it took only 15 minutes to fix it.
But by then I already spent hours trying to find the cause of problem.
Anonymous April 14, at AM. Unknown September 3, at AM. Unknown September 4, at AM. Unknown December 4, at AM.In addition to the Amiga chipsetsvarious specially designed chips have been used in Commodore Amiga computers that do not belong to the 'Amiga chipset' in a tight sense. Gary provides glue logic for bus control and houses supporting functions for the floppy disk drive. It integrates many functions built discretely in the earlier Amiga in order to reduce costs. Gayle replaced Gary in the A and A Akiko is responsible for implementing system glue logic that in previous Amiga models were found in the discrete chips Budgie, Gayle and the two CIAs.
Additionally, the Akiko chip is able to perform simple ' chunky ' to ' planar ' graphics conversion in hardware. The Amiga's native display is a planar display which is simple and efficient to manipulate for routines like scrolling. However, chunky displays are faster and more efficient for 3D graphics manipulation.
Akiko allows this conversion to be performed in hardware instead of relying on software conversion which would cause more overhead. The conversion works by writing 32 8-bit chunky pixels to Akiko's registers and reading back eight bit words of converted planar data which can then be copied to the display buffer. Bridgette is an integrated bus buffer in the A series.
It replaces six 74Fs and four 74Fs chips used in the original A design. It contains the largest part of the operating system.
Kickstart 1. All Amiga computers use two CIA s Complex Interface Adapter for peripheral interfacing and the system timers, except for the CD32, where these functions are performed by the Akiko chip. The CIA chips were also used in some other Commodore devices. Amber was used in the A T and on the A flicker fixer expansion for the A Amber was also designed to work without expensive field memory as a simple scan doublerbut has not been marketed that way.
It also generates a monochrome composite video signal and combined sync. The A uses discrete resistor arrays and amplification. From Wikipedia, the free encyclopedia. Amiga portal.
Amiga hardware history. Minimig Natami.
The following schematics and manuals are owned and were scanned by me. Circuits and picture of the A motherboard. Size: 1. Basic testing and disassembly procedures for the A including schematics. Size: 3. Size: KB. Service Manual for the A EtherNet card, includes schematics. Service Manual for the A Multi-port Serial card, includes schematics. Service Manual for the A T Amiga computer. Includes schematics for A, A, A and B Size: 2. Schematics for the A Revision 6a and 7 Amiga computer.
Service Manual for the A Amiga computer. Includes schematics for the A and A Schematics for the ubiquitous Commodore monitor.
Service manual for the Commodore monitor. Includes schematics. Size: 7. Section 3: Amiga relevant information. The following schematics and manuals are owned by Ash and were scanned by me. Schematics for the A Rev. Part 1 of schematics for the A A Proto Rev. Size: 4. Part 2 of schematics for the A A Proto motherboard. Part 3 of schematics for the A A Proto motherboard.
Size: 6. Part 4 of schematics for the A A Proto motherboard. Size: 5. Schematics of the CPU accelerator, A Part 1 of the Developer's Conference DevCon Size: 9.It is the successor to the popular Keyrah interface.
Use the screws of the mainboard to mount Keyrah V2. Both can be found in the DIY-store of your choice. Keyrah's mounting holes are aligned for installation in a Commodore 8-bit computer, and cannot be used in an Amiga without drilling new holes. Keyrah V2 should not be used without a case. If you want to use it outside a case anyway, you should at least protect the solder side bottom of the board from short circuit. Connect the keyboard to the corresponding connector of Keyrah V2 and set the jumper to the layout you intend to use.
The correct jumper setting is printed directly on Keyrah V2. Do not remove the jumper group next to the key map jumper! Never connect power to the A LED connector! Please note that all LEDs of all keyboards that are connected to the host computer will light up at the same time. There is only one caps lock status, only one NumLock status and one Scroll lock status, and they're all equal for all keyboards.
If you press caps lock on one keyboard, it will be shown equally on all keyboards at the same time. The emulator mapping is as easy as it can get: Every keypress will cause the exact thing that you'd expect the original machine to do when you press that key.
For everyday use, the exact key mapping is described further down. To make sure that you really want to execute this, you must hold this position for at least one second. In addition to that, some keys in the left half of the main keyboard are changed into multimedia keys.
This altered key map will let you use an A keyboard as full key multimedia keyboard, despite the missing numeric key pad. In switch position "down", the following keys become multimedia keys, which may have to be assigned with a driver or program that individual Computers does not provide:. Jump to: navigationsearch. Personal tools Log in.Tweet Amiga power supply guide V1. Complete re-write of the guide Removed information on using AT power supplies. This document details how to diagnose and replace a faulty power supply on the Amiga range of computers.
Options for replacement using either an ATX PSU or smaller, compatible switchmode supplies are presented for the reader.
Original Amiga power supply ratings This information has been collated from original power supply labels, schematics or emails from fellow users. The information is presented here to help you evaluate alternative supplies. Will require a simple linear regulator circuit using a or equivalent, to generate -5V. Will require a simple linear regulator circuit using ato generate -5V. ATX power supplies. The most commonly available, high power supply is the ATX power supply.
There are two distinct variants, the original rectangular box type and the picoPSU type: Original ATX power supply, widely available This type of supply is best suited to towered or big box Amigas. Both supplies require the PS-ON signal green wire to be grounded to switch on the power supply. This ca be achieved by wiring between the two signal s or using an adaptor board, sold on this website. This is a popular power supply for the 'wedge' Amigas as it is small enough to fit inside the Amiga and is silent.
Perhaps you would like a smaller alternative to an ATX power supply, well there are a number of alternatives. It is available direct from Meanwell and from Mouser. A number of ATX power adaptors for all Amiga models are available from this website. Provided as a reference Wire colour. In this section the relevant part numbers and more importantly suppliers, are listed. If you are connecting into a PCB or wish to carefully solder onto the tabs, the part is: 20 way dual row vertical header RS I have personally bought and used all these connector types successfully.
You will require the above items to make a new power connector for your A desktop motherboard. Re-wiring the original power lead for the A, A and A This is easily done with a pair of cutters. Strip the ends of the wires. This picture of the power plug should help.
To ascertain which pin connects to which wire, either use the continuity function of your meter or use a couple of batteries, 3 pieces of wire and bulb to work out the connections. If you choose this method, be sure to insulate the unused wire.
I like to take a spare plug or socket and wire it up to the Amiga's PSU cable. For reference this is the pinout of the square DIN connector on the Amiga.
CD32 power supply mod If you own a CD32, you can easily make a power lead up. You can either cut off your original power lead and re-use the existing lead or buy a new one. A new connector is an Molex KK 3.Amiga 1200 Inspection - Nostalgia Nerd
The information above has been corrected to U, which does in fact select the clock source for the TICK input. An alternative method to generate the Tick signal is by using this circuit on Aminet: Tickit. Here is the wiring list from an ATX plug to your A Amiga pin.
Control the PS-ON ATX pin 14 either by using my circuit shown above or by connecting it to ground via a switch, which ever is easier for you.
T he A desktop machine is not too difficult to wire a new PSU upto, it only has 6 wires.So, my A arrived, but the audio isn't working properly: low sound, distorted, popping sounds, you name it.
I replaced C, C, C and C, but nothing has changed. The power brick is working properly, the V is supplied. I need the readings of C and C in my board they both sign -7v, is this correct or should it be v? In case the -7v is incorrect, what could be the cause? The board is a 1D. Any idea? Maybe the Paula chip is faulty, or not getting enough voltage. Did you noticed any other symptom as mouse erratic moving Paula sounds suspect to me too, I'll meter my board when i get home and see what voltages i read.
Find More Posts by kipper2k. JLPedro: the mouse is working fine, no problem at all. How can I check if Paula is working fine? It must be V, not -7V. Originally Posted by elspero.
Amiga 1200 CPU-port connector pinout
Originally Posted by stachu Heres Stedy's website with the schematics Thank you for the schematics, kipper2k. I replaced C, but nothing has changed.
I tested R, R, R, R and everything looks good. U15 to R is ok. R is ok. I am stuck. What now? What was the rating on the c and c that you used as replacements? Yeah, the polarity is right, I checked it before and after soldering, using a picture as reference.
The readings of the LF with the A powered on are completely off. But from where does the op-amp get the power? The outputs for the left and right channel are pins 1 and 7 respectively.