Tag: Hardware

With A Cherry On The Side – Episode Three (terminal setup and more hardware)

[A Project to interface a PS/2 keyboard to a 68hc11 microcontroller] Get Cracking! So I have the target microcontroller SBC, and have verified it is still working. Today I have been setting up more project equipment. First off, I will need to be able to run my favourite simple command-line 68HC11 cross-assembler to generate loadable … Continue reading With A Cherry On The Side – Episode Three (terminal setup and more hardware)

With A Cherry On The Side – Episode Two (How to run code from non-existent ROM)

[A Project to interface a PS/2 keyboard to a 68hc11 microcontroller] The Case of the Unmissing PROM Last time, I mentioned that there was something a bit unusual about my 68HC11E1 MCU, running the BUFFALO monitor program from on-chip PROM. Well, the issue is that the E1 model 68HC11 isn't supposed to have any on-chip … Continue reading With A Cherry On The Side – Episode Two (How to run code from non-existent ROM)

With a Cherry On The Side – Episode One

It's kinda strange to be doing this in April instead of January, but as the RetroChallenge schedule has changed, it is time to get my plan together. Inspired by previous attempts, my modest entry to RetroChallenge this time is to interface a PS/2 keyboard to a 1987-vintage 68hc11 micro-controller; enough to at least read the … Continue reading With a Cherry On The Side – Episode One

Evie Beer: Episode 4 – External Hardware

The last week has been very busy with non-project stuff, but I have managed to make progress on constructing some simple external hardware for the 68hc11 EVB to interface to. For most starter "microcontroller mucking about" projects, playing with a few LEDs is de riguer, and Evie Beer is no exception: You can ignore the … Continue reading Evie Beer: Episode 4 – External Hardware

Evie Beer – Episode 2: Waiting for Hardware

My RetroChallenge project has started slowly for me this time around, after ordering the requisite MC68hc11 EVBU single-board computer on Sunday 28th June, it didn't arrive until the following Friday, and as I had an appointment on Friday night, did not get to actually open the box and check it out until today. So what … Continue reading Evie Beer – Episode 2: Waiting for Hardware

Watts Up: Episode 14 – Ear Cable

After suspecting that I had killed both my production and spare SPARCstation-10 motherboards, it is time to prove it one way or the other. For SPARCstation-class machines, there is a handy trick that can be used to prove the main memory bus, the memory-controller, the CPUs, the basic "aliveness" of the on-board peripheral devices, and … Continue reading Watts Up: Episode 14 – Ear Cable

Watts Up: Episode 13 – Darning

From the last episode, the situation is that the old SPARCstation-10 fitted with a new NV1 PSU is not working any more. It had been, but now isn't. Swapping several parts from the dead SS10 into my "production" SS10 showed: the CPUs were good (*very* good), the TGX graphics card still works beautifully, and the … Continue reading Watts Up: Episode 13 – Darning

Watts Up: Heavy-Duty Fan-Holder

OK, time to fess-up: the 4th front socket on the fan-power distribution PCB is *not* the fan-power input: it actually originally provided a feedback voltage to the APS-39 internals, used by the APS-39 fan-speed control circuit - which is somewhat of a waste of time: anybody who has owned and run a SPARCstation-10 can tell … Continue reading Watts Up: Heavy-Duty Fan-Holder

WattsUp: It Lives!

Stage 1 success - using the NV1 PSU, with a considerably new PSU wiring loom, the SPARCstation-10 powers-up and initialises, ready to boot! . As can be seen from the graphics screen, it's running happily: Yay! You know, this project might actually lead somewhere... It seems OK with a pair of 60 MHz SuperSPARC CPUs, … Continue reading WattsUp: It Lives!