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Forum: Programming Topic: Stacking Multiplication and Division similar to ADC/SBC |
| Sheep64 |
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Posted: Sat Jul 09, 2022 4:14 pm
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Replies: 18
Views: 1546
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| ... line may be wired directly and one 8 bit ROM may perform double duty. I thought of this after studying AndersNielsen's video circuit . I made XR2801 16 bit ROM programmer with the primary purpose of programming 16*16 pixel fonts but also secondary purposes, such as Gigatron programming. More ... |
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Forum: Hardware Topic: Project Snail: 65C02 Crawling At 62.5kHz |
| Sheep64 |
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Posted: Wed Feb 02, 2022 4:54 pm
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Replies: 13
Views: 2961
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| ... I2C channel. 6522 PortA is connected to the reversible, 14 pin parallel port (CA1, GND, PWR, PA0-PA7, PWR, GND, CA2). This may be connected to a XR2800 Series EEPROM programmer , KIM-1 style interface configuration or sburrow's preferred configuration for text LCD output . The yet another 65SIB ... |
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Forum: Hardware Topic: 65816 Banks Half Filled With RAM For Symmetric Decode |
| Sheep64 |
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Posted: Wed Feb 02, 2022 4:32 pm
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Replies: 4
Views: 743
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| ... Engineering have already handled these cases. Regardless, all ABIs can be implemented using one slow, cheap 28C256 (possibly programmed with XR2801 EEPROM programmer , possibly connected to a privileged 6522). The design can be easily implemented in CPLD or FPGA. However, I strongly advise ... |
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Forum: Hardware Topic: Design challenge: 6502-based EPROM programmer |
| Sheep64 |
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Posted: Wed Feb 02, 2022 4:13 pm
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Replies: 145
Views: 12140
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| ... register which deliberately runs dry . AndersNielsen devised this to control WS2812B LEDs from 2MHz 6502 but the principle is widely applicable. XR2801 is an attempt to implement a shift register design. I'm beginning to understand that circuit board layout is an iterative annealing process where ... |
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