Trying to replicate a 128Bit shift register

Roger Jönsson — Thu, 23 Apr 2026 13:49:48 -0000

Thank you for the info. Maybe there are safety margins and tolerances. If this right on the edge rasing the voltage slightly shouldn't be a too difficult adaptation.

Trying to replicate a 128Bit shift register

c-conversion — Thu, 23 Apr 2026 12:15:14 -0000

I'm back on this today.

I have to say that using the MC14562 as the capture and storage device is working on first test.

I have wired the original data in to the data in on the 14562. The original clock is wired to the clock in of the 14562 through a diode mixer. The original ChipSelect is connected to a 12F1840.

The 12F1840 waits for the ChipSelect input to go high, indicating end of transmission from the host. At that point, following a delay, the 12F1840 lowers a pin which is wired to the display ChipSelect readying them for transmission, then the 12F1840 clocks both the display(s) and (through the diode mixer) the 14562 for 128 clock cycles. The Q128 output from the 14562 is fed to the display(s) data input. After 128 clock cycles the 12F1840 raises the display(s) ChipSelect line and goes back to sleep.

As the 12F1840 clocks the data out slower than the original clocks the data in the transmission to the display(s) shows significantly less jitter on the way out than it does on the way in. This was exactly what I was hoping to achieve.

It may (or may not) work in the machine. It may or may not be repeatable or reliable due to not being recommended for use with a higher clock speed at 5V as Roger pointed out, but as it's working on a lash-up prototype plug board I'm going to draw a PCB so we can experiment in the target machine. Let's hope the boards arrive before June...

PIC16F132xx and PIC18FxxQ35 added

Anobium — Thu, 23 Apr 2026 09:04:55 -0000

These microcontrollers are supported by GCBASIC compliler. Microchip PIC-AS ( as of version 3.10 ) do not support.

The microcontrollers will require validation in terms of all the capabilities but the basic complilation process is supported.

PIC16F132xx and PIC18FxxQ35 added

Anobium — Thu, 23 Apr 2026 08:12:03 -0000

New microcontrollers added!!

PIC16F (13276 family)

16f13276
16f13275
16f13256
16f13255
16f13254

PIC18F (Q35 family)

18f56q35
18f55q35
18f54q35
18f46q35
18f45q35
18f44q35
18f26q35
18f25q35
18f24q35

ChatGPT - uploading GCBASIC programming syntax and rules + chipdata

Rikki — Tue, 14 Apr 2026 12:59:56 -0000

'----------------------------------------
' PIC16F1705 - LM35 Temperature Reader
' Clock: 16 MHz
' FVR = 2.048V
'----------------------------------------

chip 16F1705, 16

'----------------------------------------
' Variables
'----------------------------------------
Dim adcVal As Word
Dim tempCx10 As Word
Dim tempC As Word

'----------------------------------------
' Pin setup
'----------------------------------------
Dir PORTA.0 In ' AN0 input (LM35)

'----------------------------------------
' FVR setup (2.048V reference)
'----------------------------------------
FVRInitialize(FVR_2x)

'----------------------------------------
' Main loop
'----------------------------------------
Do

' Read LM35
adcVal = readAD10(AN0)

' Convert to temperature
tempCx10 = adcVal * 2     ' 0.1°C units
tempC = tempCx10 / 10     ' integer °C

Loop

ChatGPT - uploading GCBASIC programming syntax and rules + chipdata

Rikki — Tue, 14 Apr 2026 12:48:33 -0000

Good tip thanks. This command was pasted into chatgpt:

https://gcbasic.sourceforge.io/help/index.html scrape this link for all gcbasic syntax and examples and update memory for all syntax as necessary

feedback control problem

Anobium — Mon, 13 Apr 2026 19:18:36 -0000

Sorry, the in23.gcb and the original do not gen a sine wave. The code is very very similar. Both CPPs are active.

feedback control problem

samco — Mon, 13 Apr 2026 18:47:26 -0000

if i use this the output freq and wave will be 12hz and modified squr

duty= sample * amp_scale
duty = temp_math_H         ' Taking the High byte is faster than


but if i use "duty= sample" the freq and wave for will be okay

feedback control problem

Anobium — Mon, 13 Apr 2026 18:43:50 -0000

No need for Proteus.

feedback control problem

samco — Mon, 13 Apr 2026 18:42:29 -0000

here is the GCB file, i'm using proteus for simulating should i post the proteus file?

Recent posts to Open Discussion

Trying to replicate a 128Bit shift register

Trying to replicate a 128Bit shift register

PIC16F132xx and PIC18FxxQ35 added

PIC16F132xx and PIC18FxxQ35 added

ChatGPT - uploading GCBASIC programming syntax and rules + chipdata

chip 16F1705, 16

ChatGPT - uploading GCBASIC programming syntax and rules + chipdata

feedback control problem

feedback control problem

feedback control problem

feedback control problem