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The Gigatron TTL is a retro-style 8-bit computer, where the CPU is implemented by a set of TTL chips instead of a single microprocessor, imitating the hardware present in early arcades. Its target is the computing enthusiasts, for studying or hobby purposes. [2] Assembled Gigatron kit computer in display case.
List of free analog and digital electronic circuit simulators, available for Windows, macOS, Linux, and comparing against UC Berkeley SPICE.The following table is split into two groups based on whether it has a graphical visual interface or not.
The de facto standard 5.25 inch FDD interface is based upon the Shugart Associates SA400 [6] FDD. [5]: 169 The signal interface uses a 34-pin PCB edge connector which mates to a flat ribbon cable connector. DC power is provided on a separate connector. [6] The 34-pin connector is similar in pinout to the standard 50-pin connector for 8 inch FDDs.
The IBM PC took a more conventional approach, their adaptor card could support up to four drives; on the PC direct memory access (DMA) to the drives was performed using DMA channel 2 and IRQ 6. The diagram below shows a conventional floppy disk controller which communicates with the CPU via an Industry Standard Architecture (ISA) bus or similar ...
Where BNC is used, available as 3 connectors with Sync on Green, or 5 connector Red / Green / Blue / Horizontal Sync / Vertical sync. Mac-II/Quadra DA15F: 1152 × 870 @ 75 [8] Macintosh: Mac-DA15F and Sun-13W3 were similar in capability to VGA. Some Sun machines used 4 or 5 BNC connectors to transfer video signal. 1990: 13W3 DB13W3: 1152 × 900 ...
A TTL input signal is defined as "low" when between 0 V and 0.8 V with respect to the ground terminal, and "high" when between 2 V and V CC (5 V), [22] [23] and if a voltage signal ranging between 0.8 V and 2.0 V is sent into the input of a TTL gate, there is no certain response from the gate and therefore it is considered "uncertain" (precise ...
6 hex 2-input NOR drivers driver 20 SN74ALS805A: 74x807 1 1-to-10 clock driver driver 20 IDT74FCT807: 74x808 6 hex 2-input AND drivers driver 20 SN74AS808B: 74x810 4 quad 2-input XNOR gates 14 SN74ALS810: 74x811 4 quad 2-input XNOR gates open-collector 14 DM74ALS811: 74x817 1 GTL+ to LV-TTL 1-to-6 fanout / LV-TTL to GTL+ 1-to-2 fanout driver
Early versions of the MDA board have hardware capable of outputting red, green and blue TTL signals on the normally unconnected DE-9 video connector pins, theoretically allowing an 8-color display with a suitable monitor. The registers also allow the monochrome mode to be set on and off.