vortiits.blogg.se - Making a cpu transistor

#MAKING A CPU TRANSISTOR PATCH#
#MAKING A CPU TRANSISTOR FULL#

#MAKING A CPU TRANSISTOR PATCH#

Our second prototype, a year later, fixed a few issues that we encountered when bringing up the first version (removing all of the patch wires) but also added over 100 additional LEDs, including one for every instruction decode line on the 6502's decode ROM. We brought it up to the stages of successfully running various programs in assembly, BASIC, and Forth. The first full-scale prototype was publicly demonstrated at the 2016 Bay Area Maker Faire.

#MAKING A CPU TRANSISTOR FULL#

Headed towards a full public launch delayed a bit by COVID. What is the current status of the project?

1 rectangular connector for the 40-pin "ICR" ribbon cable.

2 jacks for 5 V power: main and alternate location.

313 LEDs (The first revision board, shown in the video, has only 167 LEDs).

998 Additional parts present only in the MOnSter 6502:.

1019 resistors (the original 6502 used depletion mode MOSFETs in place of resistors).

630 located on 164 quad transistor array chips (26 of these 656 transistors are not used).

3218 enhancement mode n-channel MOSFETs.

Components that correspond 1:1 with transistors in the original 6502:.

In addition to these, there are also LEDs sprinkled throughout that indicate the values of various control lines, registers, and status bits, as well as additional transistors and resistors (not counted in those "functional" totals) that are necessary to drive those LEDs.Īs of the second revision of the board, the design statistics are as follows:

There are 3218 transistors and 1019 resistors that comprise the "functional" part of the 6502. In total, there are 4769 components on the board. How many components are there on the board? It's a four layer circuit board, 12 × 15 inches, 0.1 inches thick, with surface mount components on both sides. MOnSter 6502 is a play on the original manufacturer and device name (MOS 6502) as well as acknowledging its large size. Slight variations of it were found in the Commodore 64, the Atari 2600, and the original Nintendo Entertainment System. The 6502 is the famous processor found at the core of such influential computer systems as the Apple ][, the Commodore PET, the Atari 400 and 800 home video game consoles, the BBC Micro, and the Tamagotchi digital pet. A dis-integrated circuit project to make a complete, working transistor-scale replica of the classic MOS 6502 microprocessor.