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Here's the setup:I would really like to share the project with others, and it would be great to see some people building these boards. This clock also drives a state machine which arbitrates memory access for the host CPU and the scan-out logic. I'm using the design of the video card as an opportunity to validate some tech that I'm going to use in an MC68030-based system that's coming along soon. The basic format of all the instructions is same. A half-decent TCP implementation is going to take a lot of work, but it should be an interesting challenge.SN76489 ($0.50 each)I think it would be entirely possible to implement ISA in a reasonably "vintage" CPLD. I looked into it during the early stages of the project. What put me off was its relatively low performance, and the fact that it's *very* 8086-centric. I ended up implementing my own peripheral bus, which has a 16-bit non-multiplexed data bus and runs at the system bus speed. This gives significantly better performance than ISA, but obviously has the (major) disadvantage of preventing me using commercial ISA cards. PCI is a different matter. The big drawbacks of PCI, from my perspective, were a) it's a closed standard, b) it's a 32-bit bus, and c) it operates far faster than the 68010 on on my motherboard.Here's another picture of the board - this time with RAM modules, ATA CompactFlash card, RS232 cable and power supply plugged in.dT,max = (Tjunction,max - Tamb) = (1 - efficiency) * P * Rthermal = 0.16 * 25 * Rthermal = 75Initially I designed a framebuffer card based on an MC6845. Der Motorola 68000 ist ein 1979 eingeführter CISC-Prozessor aus der 68000er-Familie von Motorola (später Freescale, heute NXP).Er besitzt intern 32-Bit-Register, einen mit 32 Bit adressierten linearen Adressraum, davon 24 Bit extern verfügbar, acht 32-Bit-Datenregister, neun 32-Bit-Adressregister, ein 16-Bit-Statusregister sowie einen 16-Bit-Datenbus. Easy! I'm working on a video card at the moment. Pre-release XC68000 chip manufactured in 1979 Die of Motorola 68000 History Motorola MC68000 (CLCC package) Motorola MC68000 (PLCC package) Motorola's first widely-produced CPU was the Motorola 6800. With this in mind I have added short-circuit protection, protection against shorts to out-of-range voltages (within reason), and some transient/noise suppression. Does it even get hot?
Either as a Multi-board project or as a Single board design for other to build and learn !Thanks for your comment! Thanks for your interest in my project :)There are horror stories about the damage caused by unplugging PS/2 peripherals from early PCs. It can also read/write VRAM via internal registers if required. Also what sockets are you using to plug in peripherals like the Graphics card and the Ethernet card?Thanks very much for taking an interest - it's really nice to be asked about the system :)I know you don't want to make this a 'commercial' product... but turning it into a homebrew Self-Build kit for others to learn about computer design and architecture would be really COOL. That's a sweet looking system. If you're not in the mood for reading a rant, please don't bother reading on.If I find it interesting, I'll add it hereThe picture below is a screenshot of a serial terminal session between my dev PC and the 68010 system. USB felt too modern for this project - after all, the idea is to build a system which has a level of technology roughly in line with the sort of stuff that was available in the 80s and early 90s. A new unprivileged "MOVE from CCR" instruction is provided for use in its place by user mode software; an operating system can trap and emulate user-mode "MOVE from SR" instructions if desired. Daraus erklärt sich auch die Verwendung des Programmier-Modells:Die Fähigkeit des 68000, bei fast allen Kommandos auch 32 Bit breite Adressen und Daten zu verstehen (die dann natürlich bei einem 16-Bit-Bus in mehreren Zyklen gelesen werden mussten), vereinfachte die Softwareentwicklung ungemein, da es sich quasi um eine 32-Bit-Architektur handelte. I'm shooting for a resolution of 800x600, which requires a 40MHz pixel clock. What you describe is reasonably close to the approach I'm taking. The point of the project, however, has always been to learn as much as possible. VGA/ or PAL/NTSCMost of the pins are directly mapped to the 68000 bus interface; some are a little different.
Here's the setup:I would really like to share the project with others, and it would be great to see some people building these boards. This clock also drives a state machine which arbitrates memory access for the host CPU and the scan-out logic. I'm using the design of the video card as an opportunity to validate some tech that I'm going to use in an MC68030-based system that's coming along soon. The basic format of all the instructions is same. A half-decent TCP implementation is going to take a lot of work, but it should be an interesting challenge.SN76489 ($0.50 each)I think it would be entirely possible to implement ISA in a reasonably "vintage" CPLD. I looked into it during the early stages of the project. What put me off was its relatively low performance, and the fact that it's *very* 8086-centric. I ended up implementing my own peripheral bus, which has a 16-bit non-multiplexed data bus and runs at the system bus speed. This gives significantly better performance than ISA, but obviously has the (major) disadvantage of preventing me using commercial ISA cards. PCI is a different matter. The big drawbacks of PCI, from my perspective, were a) it's a closed standard, b) it's a 32-bit bus, and c) it operates far faster than the 68010 on on my motherboard.Here's another picture of the board - this time with RAM modules, ATA CompactFlash card, RS232 cable and power supply plugged in.dT,max = (Tjunction,max - Tamb) = (1 - efficiency) * P * Rthermal = 0.16 * 25 * Rthermal = 75Initially I designed a framebuffer card based on an MC6845. Der Motorola 68000 ist ein 1979 eingeführter CISC-Prozessor aus der 68000er-Familie von Motorola (später Freescale, heute NXP).Er besitzt intern 32-Bit-Register, einen mit 32 Bit adressierten linearen Adressraum, davon 24 Bit extern verfügbar, acht 32-Bit-Datenregister, neun 32-Bit-Adressregister, ein 16-Bit-Statusregister sowie einen 16-Bit-Datenbus. Easy! I'm working on a video card at the moment. Pre-release XC68000 chip manufactured in 1979 Die of Motorola 68000 History Motorola MC68000 (CLCC package) Motorola MC68000 (PLCC package) Motorola's first widely-produced CPU was the Motorola 6800. With this in mind I have added short-circuit protection, protection against shorts to out-of-range voltages (within reason), and some transient/noise suppression. Does it even get hot?
Either as a Multi-board project or as a Single board design for other to build and learn !Thanks for your comment! Thanks for your interest in my project :)There are horror stories about the damage caused by unplugging PS/2 peripherals from early PCs. It can also read/write VRAM via internal registers if required. Also what sockets are you using to plug in peripherals like the Graphics card and the Ethernet card?Thanks very much for taking an interest - it's really nice to be asked about the system :)I know you don't want to make this a 'commercial' product... but turning it into a homebrew Self-Build kit for others to learn about computer design and architecture would be really COOL. That's a sweet looking system. If you're not in the mood for reading a rant, please don't bother reading on.If I find it interesting, I'll add it hereThe picture below is a screenshot of a serial terminal session between my dev PC and the 68010 system. USB felt too modern for this project - after all, the idea is to build a system which has a level of technology roughly in line with the sort of stuff that was available in the 80s and early 90s. A new unprivileged "MOVE from CCR" instruction is provided for use in its place by user mode software; an operating system can trap and emulate user-mode "MOVE from SR" instructions if desired. Daraus erklärt sich auch die Verwendung des Programmier-Modells:Die Fähigkeit des 68000, bei fast allen Kommandos auch 32 Bit breite Adressen und Daten zu verstehen (die dann natürlich bei einem 16-Bit-Bus in mehreren Zyklen gelesen werden mussten), vereinfachte die Softwareentwicklung ungemein, da es sich quasi um eine 32-Bit-Architektur handelte. I'm shooting for a resolution of 800x600, which requires a 40MHz pixel clock. What you describe is reasonably close to the approach I'm taking. The point of the project, however, has always been to learn as much as possible. VGA/ or PAL/NTSCMost of the pins are directly mapped to the 68000 bus interface; some are a little different.